Best Solar Inverter in India 2021: Reviews & Buyer’s Guide

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The following are the top ten solar inverter products for 2019. All companies are competing to achieve the lowest level electricity cost. We also included our first inverter concerning electric vehicle charging. Take a look at this year’s innovative products (listed in series by company) in the category of solar inverters (grouped by micro-transmitters, cord / central inverters and energy optimizers).

Inverters are an important part of any solar installation; they are the brain of the system. Although the primary task of the inverter is to convert the DC energy generated by the solar panel into usable AC energy, its role is only expanding. The inverters allow monitoring so that installers and homeowners can see the performance of the system.

Our Top Pick

Last update on 2022-11-24 / Affiliate links / Images from Amazon Product Advertising API

Top 10 Best Solar Inverter To Buy In 2021

Last update on 2022-11-08 / Affiliate links / Images from Amazon Product Advertising API

10 Best Solar Inverter Review

Bestseller No. 1
Renogy 3000W Pure Sine Wave Inverter 12V DC to 120V AC Converter for Home, RV, Truck, Off-Grid Solar Power Inverter 12V to 110V with Built-in 5V/2.1A USB Port, AC Hardwire Port, Remote Controller
  • 【RELIABLE QUALITY】ETL certification listed. Offers 1-Year material and workmanship warranty.
  • 【POWERFUL DC-AC】3000W continuous, 6000W peak surge during load start-up, 12V to 120VAC pure sine wave with conversion efficiency >90%, reduces conversion loss.
  • 【SAFE FOR USE】LED indicators for under-voltage and over-voltage protection, over-temperature protection, over-load protection, and short circuit indication. Cooling fans and ground-fault circuit interrupter (GFCI) protection.
  • 【PROTECT YOUR ELECTRONICS】Advanced pure sine wave technology provides quality AC equivalent to grid power which will protect and extend the life of your electronics and appliances. With its quiet and high inductive loads, there are no strange buzzing sounds when your electronics are turned on, and allow them to run smoother, cooler, and quieter.
  • 【EASY-TO-USE】 Offers a built-in 5V/2.1A USB port, 3 AC Outlets and 1 AC Terminal Block, along with a 19.8ft Wired Remote Control.
Bestseller No. 2
Mulcort Solar Power Inverter, Power Inverter LCD Display DC 12V to 110V AC 1500W High Efficiency Sine Wave Inverter Home Car RV Solar Power Converter
  • The solid and durable aluminum housing can provide protection from drops and bumps and stand up to harsh environments.
  • Can produce cleaner, smoother, quieter, and reliable power to operate fans, lights, and other electronics without interference.
  • High-performance cooling fan helps keep the inverter running at a low temperature and extend the life span of it.
  • Has over-voltage protection, over-load protection, low voltage protection, over-current protection, over-temperature protection and short circuit protection to guarantee safety use.
  • With intelligent LCD display, convenient for you to know the battery status and the load capacity.
Bestseller No. 3
1200Watt Power Inverter 12V DC to 110V 120V AC with 20A Solar Charge Controller Remote Control Dual AC Outlets & USB Port for RV Truck Solar System
  • Giandel:A leading inverter brand in USA,Australia,UK,etc, providing high quality inverters. This 1200Watt inverter provides 100% full continuous output power and 2400Watts peak power,featuring 2 AC outlets and 1x2.4A USB port,with Remote controller and cable;give more power than 1000W inverter
  • 20A Solar charge controller(PWM):It is just a plus for a inverter.Suitable to connect a 300Watts(15-18VDC) solar panel directly to charge SLA or GEL battery, with a selectable switch.With battery voltage indicator to watch the battery charging status.
  • Dual AC outlets and 1x2.4A USB charging port ideal for Camping,Cars,Boats,RVs,Emergency,Powering your TV,game player,laptop, lights, power tools
  • Isolated Input/Output design with Fully Safety Protections:Over voltage,Low voltage,Overload,Short circuit,Over heat,polarity reverse protection(fuse),Soft start tech,Auto-restart function
  • Durable aluminum alloy housing provides advanced protection from drops and bumps. Integrated cooling fan helps reduce heat and prevents shortages. 18-Month Warranty provided by GIANDEL
Bestseller No. 4
ECO-WORTHY 600W 12V All-in-one Solar Hybrid Charger Inverter: Built-in 600W Solar Inverter & 30A Controller for Home RV Shed Off-Grid System
  • [All-in-one]: A combination of a 600W 12V Pure Sine Wave Inverter and a 30A PWM Solar Charge Controller. No need to worry about your system taking up too much of your space. It's perfect to use in RV, house, farm and other off-grid system
  • [Easy Wiring]: This hybrid inverter was designed to optimize off-grid systems. It takes only 3 steps to setup. With clear installation instruction, even a starter can use it easily.
  • [Real-time Status Display]: The LCD display screen shows monitor photovoltaic input, AC output, battery level and load level, allowing you to monitor and adjust your system's working status.
  • [Multi-protections]: One machine to protect the whole system. Built-in PWM controller and inverter protect your system from PV adverse current, PV short circuit, Overheat and Overload.
  • [Customer Service]: We have a professional technical support team standing by for all the questions you might have. If you do, don't hesitate to contact us.
Bestseller No. 5
SUNGOLDPOWER UL1741 Certified 6500W DC 48V Solar Inverter Charger with WiFi AC Output 120V Built in MPPT Max 120A Solar Charger SP6548 Parallel Power Inverter
  • ★UL1741 Standard Solar Inverter: 6.5KW DC 48V (SP6548 series) pure sine wave AC output 120V, Built-in MPPT solar charger max 120A and utility battery charger max 120A, Max PV input 390V (Voc) ,Dual PV input
  • ★ Parallel Kit: parallel support up to 6 units, 120V single phase (1 unit ),120V/240V Split Phase capable (2 unit parallel),208V 3-Phase Support (3 unit parallel)
  • ★ WIFI Model : Built-in WIFI transmitter,Enable inverter data to be transmitted via WIFI to user's iphone or android smartphone, app can be downloaded from apple or android store
  • ★ Batteryless support: the inverter can power the loads from PV array / ac grid without battery connected
  • ★ LCD operation: Detachable LCD control module with multiple communication ports for BMS (RS485, CAN-BUS, RS232)
Bestseller No. 6
5000W Solar Inverter Charger 48V DC to 110V AC, Off Grid Pure Sine Wave Inverter 5000W Built in 80A MPPT Controller, Max 500V PV Input, for 48V Lead Acid/ Lithium Batteries
  • 5000W Hybrid Inverter 48V DC to 110V/120V AC, built in 80A Mppt charge controller, is a new all-in-one hybrid solar inverter charger, fit for 48V Lead-Acid(seal, AGM,Gel,Flooded) and Lithium battery. Support Utility/Generator/Solar Charge.
  • Pure sine Wave mppt Inverter Max Input Power: 5500W, Voltage range:120-500Vdc, Max input solar current:16A and Max.Power output: 5000W, max charge current: 80A. AC input Voltage range: 90-140V, Output 100/105/110Vac ±5%.
  • Solar Inverter 5000 Watt 110V Full digital voltage and current double closed loop control, advanced SPWM technology, output of pure sine wave.Two output modes: mains bypass and inverter output; uninterrupted power supply.
  • 110V All in One Solar Inverter Charger will have Four charging modes are optional, i.e. PV priority, Utility Priority, Hybrid Charging, and Only Solar Charging; and two output modes are available, i.e. Inverter and Mains, to meet different application requirements.
  • LCD display designand 3 LED indicators for dynamic display of system data and operating status, Intelligent variable speed fan to efficiently dissipate heat and extend system life. Can be accessed to a variety of household and office loads, including refrigerators, lamps, televisions, fans, air conditioning and other AC loads
Bestseller No. 7
Sigineer Power 48V 6000W Off-Grid Solar Inverter Charger,48Vdc and 240Vac Input to 120V 240V AC Split Phase Pure Sine Wave Output,Built-in 80A MPPT Solar Controller,Remote Control,18000W Surge
  • ALL-IN-ONE: Technically electrical combination of 6,000 watts 48V DC to 120V/240V AC split phase pure sine wave inverter, 80A MPPT solar charge controller, 60A AC to DC battery charger and automatic transfer switch, ideal for off-grid solar system
  • POWERFUL: 18,000 watts surge for 5 seconds, low frequency with transformer, multi-stage smart charging, compatible to mains voltage and generator power, 10ms typical transfer time, capable of powering demanding loads like microwave oven, refrigerator, air conditioner, washing machine, pumps, and so on
  • INTELLIGENT: Auto-wakeup MPPT charge controller, auto-recovery from over-load/low-battery cut-off, automatic load detection on both hotlines, automatic over-load bypass, programmable LCD menu, remote monitoring and control on APP by WI-FI/GPRS
  • ADVANCED: AC/Battery/PV priority selector, 4 charging modes, 3 output power priorities, BMS port supports RS485 communication with lithium batteries including Tesla modules, designed software protections against overload, short circuit, over-temperature, under & over voltage
  • BUY WITH CONFIDENCE: Trust Sigineer Power, a dedicated inverter brand and professional manufacturer in business for over 10 years, offering lifetime tech support with 1 warehouse and 3 contract service centers in the USA
Bestseller No. 8
PowMr 5500W Hybrid Inverter 48V DC to 220-230V AC, Off-Grid Pure Sine Wave Inverter with 80A Charge Controller, for 48V Lead-Acid, Lithium Battery and Without Battery
  • 【PURE SINE WAVE INVERTER】5.5KW Solar Hybrid Inverter Output Voltage Regulation: 230Vac±5%, Max Input Power: 5500W; Max PV Array Open Circuit Voltage: 500DC, PV Array MPPT Voltage Range: 120VDC~450VDC, Max AC Input Voltage: 300Vac, Input Current: 18A.
  • 【Multiple Battery Options】5500W Solar Inverter 48V DC to 220/230V AC, Built in 80A MPPT Charge Controller. New Upgrade Pure sine wave inverter, for 48V Lead-Acid(Seal, AGM, Gel, Flooded)/Lithium battery and can running without battery.
  • 【w/LCD & LED DISPLAY】Hybrid Inverter Configurable input voltage range for home appliances and personal computers via LCD setting. Its comprehensive LCD display offers user-configurable and easy-accessible button operation such as battery charging current, AC/solar charger priority, and acceptable input voltage based on different applications.
  • 【Complete Protections】PowMr inverter has Overload/Over temperature/Short circuit protection. Smart battery charger design for optimized battery performance. 48VDC to 220VAC inverter Compatible to mains voltage or generator power, Automatic restart when AC power is restored.
  • 【Scope of Application】This Off-Grid inverter can power all kinds of appliances in home or office environment, including motor-type appliances such as tube light, fan, refrigerator and air conditioner. But not support parallel.
Bestseller No. 9
vinmax 3000W Solar Inverter New Upgrade Solar Charge Controller Inverter Support Split Phase 80A MPPT 48V 120V/240V Home Use (48V) Shipping from US
  • 🌟 2023 NEW UPGRADE: We use 2023 newly developed materials with better quality than before. In addition, the outer package is reinforced to ensure that you can receive a brand-new inverter. We have been continuously optimizing our inverter to ensure that it always comes first.
  • 🌟This is a multifunctional solar inverter, integrated with a MPPT solar charge controller, a high frequency pure sine wave inverter and UPS function module in one machine.🌟Pure sine wave output 3KW. Inbuilt MPPT 80A.Parallel operation up to 6 unit.🍒 Notes:Shipping from the US ,it will arrive you about 3-6 days.Absolutely meet your demand to the best.Thank you!
  • 🌟Supports Li Ion and Lead Acid, User can choose proper capacity lead acid battery with nominal voltage at 48V for 48V model and at 24V for 24V model.Split Phase inverter Output 120V (or use two make output to 240V), 60Hz/50Hz can be setting.
  • 🌟High frequency inverter with small size and light weight. Overload, short circuit and deep discharge protection. Compatible to mains voltage or generator power.
  • 🌟 【 5-YEAR GUARANTEE AND 100% AFTER-SALE GUARANTEE】vinmax solar inverter is a perfect gift idea for your family and friends.Sincerely, we can offer a full 5-year quality guarantee and friendly lifelong support.And if you have any question about solar inverter,pls contact us freely.

Last update on 2022-11-08 / Affiliate links / Images from Amazon Product Advertising API

What is a Solar Inverter?

Within the power industry, an inverter is a device that helps to convert direct current (DC) into alternating current (AC). Solar inverters are devices that convert the electricity from the solar panels, which is generally in direct current, into alternating current. Most appliances, lighting, and household electronics use the alternating current hence the conversion need.

As sunlight hits the solar photovoltaic system, electrons within cells in the solar panel move around to produce direct current. Circuits within the solar panels collect this energy, but unfortunately, most homes use AC rather than DC. Well, that’s where the solar inverters come into play.

When the cells in the solar panel produce electric energy, the electric current flows to the solar inverter. The inverter then converts the DC into AC. From the inverter, the AC energy is ready for use to power the various appliances and lighting within the building.

As more people embrace the use of solar energy, it is crucial to ensure that you have an efficient solar system, that can meet all your power needs. The efficiency of a solar system not only depends on how powerful the solar panels are but also solar power inverters.

With a grid-tied solar inverter, if panels harvest excess energy, more than you need, you can always feed it back to the grid. This way, you will have electricity from the grid, when your panels are not active.

Purchasing a solar inverter might be an uphill activity sometimes. This is because one may get confused about which are the best solar inverters in the current market. This is why it helps to know what to look for.

Off-Grid vs. Grid-Tied Inverter

How does a grid-tied inverter work? Well, it basically converts DC power that’s stored in the solar panels into AC, after which it sends it to the grid in order to obtain credit. Now, there are literally only two parts involved in wiring a grid-tied inverter, the inverter itself and your solar panels, which is why they’re so simple and easy to install and use. There are some grid-tied units that come with batteries nowadays but they’re still a rare find.

What about off-grid inverters, you ask? Off-grid inverters require a third component in order to function and that is a battery.

First, the solar panels transfer energy that’s still in DC form to the batteries, which the inverter inverts into AC power that you can use for all your household appliances. In a way, this system is sort of like a mini power grid, and the best part is that the inverter won’t use up the power in your batteries as the solar panels will constantly charge your battery bank.

Since they contain extra parts like a battery monitor, charge controller and AC/DC circuit breakers, off-grid inverters are significantly more complex than their grid-tied counterparts. Not only that, but you also have to account for the added off-grid equipment that you need to make the system work, including remote controls, surge suppressors, breakers and enclosures etc.

We understand that some of this terminology might be a bit confusing at first, but you need to get used with it so that you can understand the following information. It’s going to help you make an informed purchase when the time comes for you to buy a converter.

How Solar Inverters Work in a PV System

As soon as the sun hits the solar photovoltaic (PV) system, the electrons inside the solar cells shake about to create DC energy. Thanks to the circuits within those cells, enough energy is accumulated to power your home.

Solar panels collect sunlight and convert it into energy, and once that energy has been sent to an inverter, it gets converted from DC energy to AC energy. In this form, solar energy has the capacity and ability to power all kinds of appliances around the house such as the kettle, stoves, hair dryers and other electronics.

How to Choose a Solar Inverter

The following are a few important facts that you need to keep in mind before you purchase a solar inverter:

  • Check the Size

First off, consider the amount of power that you need to run your household. Determining the appropriate off-grid inverter size that’s right for your home is pretty simple and requires only that you make a list of all the appliances that you’ll be using around the house.

Then, calculate the wattage of all the different appliances and lights put together to figure out how many watts your system will need to generate in order to power everything at once. Of course, you probably won’t have everything running at the same time, but aggregating everything like this is the best way to get the most out of your solar system.

Remember to include the voltage that each appliance requires to run smoothly. The average appliance typically runs on 120Vac, whereas something as complex as a good pump might require up to 240Vac.

  • Consider Pure Sine Wave Instead of Modified Sine Wave

We won’t go into how pure sine wave inverters work in this article, as that would require a whole other post. However, we can tell you that they provide a cleaner power output than a modified sine wave inverter.

However, some people opt for modified sine wave inverters anyway because they’re a much cheaper option but they end up with low-quality power output as a result.

Pure sine wave inverters, on the other hand, provide excellent quality power output that’s comparable to a power grid (and in some cases even better).

Also, modified sine wave inverters have been known to negatively affect the performance of certain appliances like pumps, compressors and motors that just wear out quicker than they’re supposed to. It can also damage computers to the point of complete breakdown, while TVs and radios often end up with static background noise or develop poor audio and video quality.

That’s why we highly recommend that customers go for pure sine wave inverters to avoid these and other problems. Even if you have to save a little more for them, it’s worth the wait because you know they’ll help extend the lifespan of your appliances.

If you want to know what the difference is between a pure and modified sine wave inverter, simply look at its total harmonic distortion (THD) rating. This is usually written on the inverter’s spec sheet and tells you what the power quality output of the inverter is.

  • Look at the Technical Specs

The following is a list of important technical specs to look out for when making your purchase:

  • Efficiency – This basically refers to the maximum amount of battery power that the inverter will be able to deliver to your home appliances. Ideally, you want your inverter to have a maximum efficiency rating of 94% to 96%.
  • Self-Consumption or No-Load Current Draw – Even when it’s sitting on standby, your inverter will continue to consume power. For the best results, make sure you go for an inverter that has low power requirements.
  • Surge Capacity – No matter how efficient your system is, short-term overloads can happen. You need an inverter that has a high surge capacity so that it doesn’t trip when this happens. Also keep in mind that certain appliances like the fridge require up to 3x of their normal energy requirement to even power up.
  • Battery Charger Output – A thoughtfully designed off-grid inverter should come with its own battery charger that you can use along with a backup generator to keep the lights on during the cold winter months. The battery charger for a solid quality off-grid inverter will have a rating of about 50-100 amps DC to keep you going.
  • Temperature Range – Whatever you do, don’t store your inverter in an area that experiences extreme temperatures because they are very sensitive to extreme heat.
  • Warranty – The standard warranty period for an inverter starts at one year, but this can go up to 3, 5 and even 10 years if the manufacturer is willing to provide an extension.

If you want to find out how your inverter measures up based on the above mentioned technical specs, simply look at the product’s spec sheets, or consult with a specialized solar technician to help you choose a good quality inverter.

  • Research Features

Depending on the inverter you end up choosing, you may need to purchase a few extras, such as:

  • Battery Charger – This will keep your system running even when there’s no sun for your solar panels to draw energy from. These can also double as inverters when needed, and they work by drawing power from a backup AC generator.
  • Grid-Tied Capability – If you’re considering a grid-tied setup with backup battery power, then it might be worth it to consider a grid-tied inverter with the ability to send power to a central grid.
  • Automatic Generator Start – While this particular function comes as a standard feature of some inverters and charge controllers, yours might require one that comes as an extra attachment.
  • Read Up on the Manufacturer – To make sure that the product you’re purchasing is of high quality, do your research on the manufacturer and find out what kind of reputation they have. At the end of the day, inverters are a long-term investment that you should purchase from a reliable manufacturer.
  • Check for UL Listings and Certifications

For the purposes of code compliance and safety, off-grid inverters need to be certified according to the law.

For example, home inverters require a UL 1741 listing, while boat and RV owners need to carry a UL 458 for their mobile inverters.

Inverters that are used for emergency purposes require a KKK-A-1822E certification, and you’ll need a UL 1778 in order to enjoy uninterruptible power supply.

If you’re outside of the US in a place like Canada, you’ll need to have a CSA 107.1 standard certification, and for those outside of North America, there’s the IEEE 1547 standard certification which is internationally recognized.

  • Check the Price

As with anything that you purchase, the price will play a huge role in the type of inverter that you choose, and of course, you get what you pay for. Oftentimes, the pricier a model is the more features it has.

Also consider the price of the components required when installing the entire system, including circuit breakers, mounting plate, remote control etc., and don’t be afraid to shop around to compare prices too!

Types Of Solar Inverters

There are several types of solar inverters that are available in the market. But there are two major classifications of solar inverters.

1. Based on the working – a) String inverters  b) Central inverters  c) Micro-inverters

2. Based on interaction with the grid power – a) Stand Alone inverters  b) Grid Tie inverters  c) Backup battery inverters

String Inverters

These inverters are connected to several “strings” of solar panels.

A string of solar panels is basically, a row of solar panels that are connected together.

For example, if you have installed 25 solar panels on your rooftop, you could have installed 5 rows of 5 solar panels each. Each row here is called a string. This type of inverter gets its name from the fact that the photovoltaic modules are connected in a series circuit, or a string, before connection to the inverter.

A large system might require multiple such string inverters to accommodate a number of such strings. Some of these inverters come with Maximum Power Point Tracking (MPPT) to maximize the energy produced by your solar modules.

This technology has been traditionally used for both residential applications as well as commercial applications and is very reliable while being the cheapest type of inverter that is currently available.

Their installation and maintenance are very simple as there is only one point of conversion of DC to AC.

Despite, being a trusted technology, the string inverter comes with its own drawbacks.

One major disadvantage is that, due to the solar panels being connected in series, even if one solar panel performs poorly the performance of the whole string of panels is lowered.

This issue is magnified when even one of the solar panels is affected by shading due to some objects in its vicinity, like trees, or even due to fallen leaves, dust, or dirt covering the solar panel. So, when even just one or two solar modules experience shading, the entire string of solar panels will produce lesser power, despite having enough sunshine on most of them.

Moreover, the series connection makes troubleshooting difficult i.e., identifying the faulty solar panel(s) is a huge task since the string inverter basically treats the various strings of solar panels as one, really big, solar panel.

Central Inverters

Central inverters are basically a bigger sized string inverter.

Their working is similar to that of string inverters, but are capable of handling a larger number of strings. Instead of the strings running directly into the inverter as is done in the string type inverter,  a combiner box is used before the inverter where the various strings are connected and then the DC power is sent to the inverter, where it is converted to AC power.

This type of inverter is more suitable for larger systems, of the order of 5 MW. They work best when used with a large system that has a consistent production of power across the various arrays of solar panels.

Just like the string inverter, the central inverter is also very reliable and has been widely used all over the world. The central inverter is comparatively cheaper than the string inverter due to the fewer components that it needs.

The central inverter is similar to the string inverter in more ways than one, but as it is a bigger version of the string inverter, both the pros and cons of the string inverter are amplified in the central inverter as is seen in the case of shading.

For a central inverter, even 10% of shading could result in a 50% reduction of power produced.

Micro-Inverters

Micro-inverters, as the name suggests, are small inverters that are fixed right behind each solar module. These micro-inverters, convert the DC power that they receive from each of the modules into AC power directly, which is then combined and supplied to the power grid.

Since each solar panel has its own inverter, this allows for the parallel connection of the solar panels which yields better output from the solar panels as compared to string and central type inverters.

Micro-inverters are capable of producing up to 25% more power than string or central inverters.

Moreover, since micro-inverters are fixed to each solar module, they are even capable of maximum power point tracking. Without going into the technicalities, maximum power point tracking (MPPT) is a technique used to maximize power output, despite the varying irradiance conditions.

Micro-inverters also make troubleshooting easier, as any fault in the system can be easily tracked and identified.

Micro-inverters, despite being clearly better than the string and central type of inverters, is the most expensive of the three seen so far, which has been a limiting factor in their usage.

Micro-inverters are better suited for residential purposes where shading plays quite a significant role. Moreover, due to the smaller number of solar panels used, and the smaller size of the system, the extra money spent on the micro-inverters is quite less.

But it is not suitable where battery storage is being considered since it converts the DC power immediately into AC power. Hence, it does not work well with a battery bank, as batteries require DC power.

Stand-Alone Solar Inverters

Stand Alone Inverters are inverters that draw DC power from rechargeable batteries and convert them into usable, AC power. The batteries are connected to the solar modules and are charged by the DC power generated by them.

These inverters are used in places where there is no electrical connection, like in the rural areas, or when one wants to be completely independent of the electric utility grid. Such a system will be unaffected by power outages and any other such issues faced by the electric utility grid.

They have no interaction with the utility grid, which has its own pros and cons.

The major advantage is that, power outages and other technical issues that the utility grid faces will no longer be effective, as you have your own independent power system.

But, on the flip side, it also means that if your power system crashes, then you will be left without any power until the issue is settled.

Grid-Tie Solar Inverters

Grid-Tie Inverters are inverters that are connected to the local utility grid and send all the power generated by the solar array back to the local power grid.

In a grid-tie system, the DC power generated by the solar array is sent to the grid-tie inverter, which converts it to AC power and sends the AC power to the local power grid. The local power grid then supplies power to your home, just like any other regular home.

In such a system, it is necessary to ensure that the solar energy system is wired to the local power grid through your electricity meter so that the local electricity board can give you credit for the energy that you produce.

Such a system, though, is not immune to power outages due to the lack of a backup battery to provide backup in case of a power outage.

All grid-tie inverters are supposed to have anti-islanding protection, which forces them to shut down during a power outage. Without anti-islanding protection, your solar power system will continue to send power to the local power grid even during an outage.

This energy will remain in the local grid and is called as an island. These islands can be dangerous to maintenance workers who could be working on the grid, trying to repair the grid during a power outage.

Hence, anti-islanding protection is absolutely vital for such an inverter.

Such inverters are particularly useful in urban areas, and such systems are cheaper than the stand-alone power systems.

Backup Battery Solar Inverters

The backup battery solar inverters are known by several names, such as the Dual Inverter, Dual-Function Inverter, Grid-Interactive Inverter, and much more. This type of inverter sends the DC power generated by the solar panels to a battery, where it gets stored.

Power from the battery is sent to the inverter, where it converts the DC power into AC power for usage. When the battery is fully charged, and excess energy is produced by the solar modules, the excess energy is sent to the local power grid through the inverter.

So, the backup battery solar inverter, basically, takes the pros of both stand-alone inverters and grid-tied inverters and puts it in one package.

Such an inverter protects you from power outages through the batteries and uses the local grid power when your solar power system encounters an issue. Like the grid-tie inverters, these inverters also need to have anti-islanding protection, to ensure that power is sent to the local power grid during a power outage.

This type of inverter is more expensive than the other two types of inverters but given the functions that it is capable of doing, the extra money will be worth it.

What To Consider In A Residential Inverter

Inverter Price

Most grid-connected inverters are offered with the solar power system quote. A good quality small 5kW single-phase solar inverter can cost around $1,000 for a simple, no frills inverter and add another $400 for a 3-phase model. A good 5kW premium model solar inverter from the above range can reach to $2,000.

Solar inverters are rated in both “DC input” and “AC output”. The solar inverter needs to be capable of handling the maximum power that your solar power system can generate, so, for 5kW of DC output from your solar panels consider a 5kW inverter. However, the solar inverter’s AC kilowatts output can be rated at 25% less than your panel because there are up to 25% losses during daily operation.

Inverter For PV System To Be Upgraded

Sometimes your quoted price will offer you the option of a larger (say 6kW) inverter (with the 5kW array) assuming later you may wish to add solar panels. You need to confirm how much roof space you have for solar panels and then if that number is enough for your needs. Put the number of solar panels that comfortably fit on your roof, and then purchase the inverter to fit that system’s power. You could possibly consider micro-inverters, or a multi-string array or a MPPT expandable solar inverter if you intend expanding the solar array later.

Inverter Weatherproof

Some grid-connected inverters are weatherproof. You can check your specification sheets for those details but remember your solar inverter has a lot of sensitive electronics. It’s best to put the inverter in the shade out of the weather and keep your solar panels in full sun.

Inverter Warranty

Solar inverters have warranties ranging from 5 to 12 years. Typically, a grid-connected inverter will last between 10 to 20 years. You should expect an inverter warranty of 10 years minimum.

Inverter Display

Most solar inverters have a digital display indicating that the unit is on, off or standby mode. The better ones have displays that indicate some of the following information:

  • Kilowatt-hours of energy you have produced each day,
  • Kilowatt-hours of electricity produced since you installed the unit
  • Kilowatts of power the unit is currently producing
  • Hours that the unit has been producing power

Consider a remote monitoring option if you don’t want to check the meter box to see if your system is performing as it should.

Tips For The Solar System Inverter Buyer

As a solar buyer, you might consider the following things to get the best inverter for your solar system and money:

  • What kind of maintenance will the inverter of your choice require and what will that cost?
  • An inverter should not cost more than 20% of the total cost of the solar PV system. But don’t simply get a cheaper inverter without comparing the features of each type.
  • What is the ‘AC power rating’ of the best inverter?
  • Does the solar inverter have MPPT?
  • Does the best inverter have MPPT and what is the warranty offered by the manufacturer? Standard lifespan of a good inverter ranges between 10 to 20 years. Most manufacturers provide a warranty cover for at least 8 years. A warranty less than 8 years should be taken off your purchase list.
  • Do you need a single inverter or multiple inverters?
  • Do you plan to expand the solar system in the near future? The best inverter that you select to buy would need to accommodate that future extra load.

Different types of batteries

Just as there are different types of inverters, you have three categories of batteries. These batteries vary depending on the internal technology used to store the current. The three types of batteries available today are as follows.

Flat Plate Battery

These are the first-generation lead-acid batteries. These batteries have two electrodes immersed in an electrolytic solution of sulphuric acid and water.

The negative electrode consists of a porous lead whereas the positive electrode is made of lead oxide. These are lightweight batteries costing in the range of around ₹ 9000 to ₹ 15000. The only disadvantage is that they require regular maintenance.

You need to replenish distilled water every three or six months depending on its usage. Delaying this top-up can damage the battery and reduce its life. Secondly, these batteries emit noxious gases whereby you need to place them in areas having sufficient ventilation.

Nowadays, these batteries are becoming outdated with the tubular batteries replacing them.

Tubular Battery

The tubular battery is an improvement over the flat plate battery. These batteries last longer than the flat plate batteries as they come with a battery life of around five years.

The reason for their efficiency is the deep charging cycles and relatively less maintenance. These batteries have tubes protected by a cloth in place of the positive lead oxide plates.

Costs wise, the tubular batter is expensive in comparison to the flat plate batteries as they come in a range of ₹ 9000 to ₹ 25000.

Sealed Maintenance Free Battery

The name explains it all. These batteries do not require any maintenance. The nature of the electrodes used is such that there is no need for replenishing with distilled water.

These batteries are the safest of the lot as they do not emit obnoxious gases. These batteries are also referred to as VRLA (Value Regulated Lead Acid) batteries. These batteries are expensive as compared to the other two categories discussed above.

They have a shorter life as well in comparison.

If you compare the various features side-by-side, the tubular batteries are the most popular of the three.

Difference between an inverter and the UPS

The fundamental functions of the inverter and the UPS are the same. However, there are minor differences. When there is a power cut, there is a need to switch over from the main line to the battery power.

The inverter takes around 100 milliseconds whereas the UPS would do the switch in 3 to 5 milliseconds. Therefore, you get almost uninterrupted power supply in a UPS system.

Specific appliances like your desktop PC can switch off even if there is no power supply for a few milliseconds. Hence, you have to use the UPS instead of the inverter to ensure that the PC does not switch off during a power cut.

There are two types of UPS, the online UPS, and the off-line UPS. The difference is that the online UPS supplies power continuously from the battery even when the mains line is on. It recharges the batteries simultaneously.

Therefore, there is no loss of power even for a single millisecond. On the other hand, the offline UPS uses the battery power only when there is a power cut. At other times, it uses the main power line.

Precautions to take while buying an inverter

Check the wiring of your house

Before purchasing your inverter, you should consult an electrician to determine whether your home wiring has a facility for backup. If you are looking for providing backup to all the home appliances, it should not be difficult.

However, people usually exclude the refrigerators and air conditioners from the inverters. Hence, it becomes necessary to consult the electrician and isolate these appliances before you purchase your inverter.

Choose the right combination of battery and inverter

We have discussed these aspects in detail. You should gauge your power requirements and choose the right combination of your inverter and battery. This table should help you select the perfect combination.

Power requirementBack Up in hoursSuggested Inverter Capacity Suggested battery size
300 Watts 2 hours750 VA50 Ah
600 Watts2 hours1500 VA100 Ah
900 Watts3 hours3500 VA300 Ah
1000 Watts3 hours4000 VA300 Ah
1200 Watts4 hours6000 VA400 Ah

Inverter trolley

Placing the inverter in the right position is a crucial aspect. It should be on level ground. An inverter battery combination is a heavy appliance. It is better to purchase a trolley that can accommodate both the inverter and the battery.

It is better to place the inverter as near to the mains supply as possible. It will avoid the unnecessary hanging of wires all over the place.

Earthing and other issues

Ensure that your home has proper earthing facilities to avoid accidents like electrocution and short-circuits. Avoid touching the inverter or battery terminals with wet hands.

Keep the inverter out of reach of the children in the home. Clean the inverter and battery of the dust that could accumulate on them.

Remember to replenish the distilled water supply at regular intervals. Keep a calendar handy where you can note down the details of refilling.

Warranty

Opt for inverters that provide a good warranty. The longer the warranty, the more is the price of the inverter. Remember, that an inverter and battery combination is a long-term investment.

Go for the best combination that ensures proper value for the money you spend.

Take care of your inverter and batteries

Purchasing an inverter should now be easy. However, you should maintain the inverter well to enable it to work efficiently for a long time.

Taking care of the batteries is vital to increase the lifespan of the inverter. We shall now quickly go through the precautions you should take to improve the life of your batteries.

1. The tubular and the flat batteries require regular replenishment of distilled water. Depending on the type of the battery and the usage of the inverter, the replenishment period can vary between one and three months.  Maintain a calendar, preferably on your smartphone that alerts you to replenish the water.

2. The socket connections can rust as the water can spill out at times. The humidity can also cause rust. This rust can affect the connections. Applying grease on these connections can help prevent rusting.  If there is corrosion, you should use a mixture of baking soda in hot water to remove the rust.

3. Discharge the battery completely at least once a month and charge it again. It will rejuvenate the electrolyte solution.

4. Do not connect heavy loads to the inverter. Avoid connecting refrigerators, air conditioners, washing machines, and water heaters.

5. If you need to use the mixers and grinders, it is better to switch off all the other appliances to prevent overloading.

6. Place the inverter on a flat surface, either horizontally or vertically.

7. Never place it near the engine compartments like your motor. Keep it away from moisture and water. Do not keep the inverter in direct sunlight. Ensure that there is ample ventilation in the room where you place your inverter.

8. Clean your inverter from time to time. Dust can stick to the connections and affect the performance of your inverter.

9. Do not place flammable materials near your inverter as you increase the risk of fire.

Take care of your inverter and batteries. They can serve you for a long time.

Best Inverter For Home – FAQ

1. Can we connect refrigerators and ACs to the home inverters?

Technically, there should not be an issue because the modern-day inverters and batteries can handle heavy-duty loads. However, refrigerator and AC compressors consume a high volume of current when they switch on. The inverter battery might not be in a position to handle this load. Hence, people avoid connecting ACs and refrigerators to home inverters.2. Which is the best type of inverter available in the market?

The Sine Wave inverter is the best because it can withstand heavy loads. They are expensive compared to other inverters, but worth the money you spend on them.3. Which is the better battery, flat plate, or tubular?

The tubular battery is a better option because they last longer and require less maintenance.4. Is the SMF battery a better option than the tubular and flat plate batteries?

SMF batteries do not need any maintenance at all. They are the safest of all the three batteries under discussion because they do not emit any poisonous gases.5. What is the difference between an inverter system and UPS?

Both inverter and UPS provide similar services but with a small difference. The inverter takes 100 milliseconds to switch from the mains line to battery power, whereas the UPS takes approximately 3 to 5 milliseconds. Thus, UPS is a better option to have for connecting electronic equipment like computers.

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