Off-grid Inverter Buying Guides

If you deciding to live in off the grid, you definitely need an off grid inverter for your solar power system. An off-grid inverter is a device that converts direct current (DC) power from batteries or renewable energy sources into alternating current (AC) power that can be used by electrical appliances. Off-grid inverters are essential for off-grid power systems, which provide electricity to areas that are not connected to the grid.

Off-grid Inverter vs. Grid-tied Inverter

Off-grid inverters are not connected to the utility power grid, while grid-tied inverters are. This means that off-grid inverters have to generate their own voltage and frequency, while grid-tied inverters have to synchronize with the grid’s voltage and frequency.

Off-grid inverters require batteries or other forms of energy storage to store the excess power from the solar panels or other renewable sources, while grid-tied inverters do not.

Off-grid inverters are generally more expensive and complex to install and maintain than grid-tied inverters, as they involve additional components such as batteries, charge controllers, and battery management systems.

Off-grid inverters can be scaled up by adding more units in parallel or series, depending on the power and capacity needs. They can also provide backup power in case of a power outage or failure of one unit. Grid-tied inverters can also be scaled up by adding more solar panels or inverters, but they cannot provide backup power unless they have a battery backup system or a transfer switch.

Even thought both off-grid solar inverter and on-grid solar inverter are converting DC power to AC power, they applies for different situations. If the area where is no grid connection or the utility grid is unreliable or expensive, off-grid inverter is the first choice.

Related: Hybrid Solar Inverter vs Off grid Solar Inverter

How to Choose the Best Off-grid Inverter

Choosing the best off-grid solar inverter depends on several factors. Here are some general steps on how to sizing for your solar inverter off the grid.

Determining the capacity of off grid inverter

Add up the daily wattage of all your appliances and devices you plan to power with your solar system.

Besides, you need to consider the peak power, which is the maximum power required when some appliances start up. Your off-grid inverter should be able to handle both the continuous and the peak power of your load. You need to consider the peak power when sizing the off-grid inverter because some appliances, especially those with electric motors, require a high surge of power when they start up. For example, a refrigerator may have a rated power of 200W, but a peak power of 600W when it turns on. If your inverter cannot handle the peak power, it may shut down or damage the appliance.

The common off-grid solar inverter size for references(measured in kilowatts):

Off grid inverter in 1-2kW suits small Cabins with lights, phone, TV and a fridge.

Off grid inverter in 2-4kW suits the Cabins and small efficient homes.

Off grid inverter in 4-8kW suits the for most off grid homes.

Off grid inverter in 8-16kW suits the Large off-grid homes, farms, ranches and small commercial buildings.

Off grid inverter over 16kW suits the Commercial building and large homes.

Choosing Pure Sine Wave Instead of Modified Sine Wave

Off grid inverters come with the waveform of pure sine wave and modified sine wave. Here we strongly recommend choosing the pure sine wave instead of modified sine wave, as pure sine wave inverters produce a smooth and stable AC waveform that is compatible with most sensitive and high-end appliances, such as computers, TVs, and refrigerators. Though the off grid inverter with pure sine wave are more expensive than the one with modified sine wave, the former is more efficient and reliable. You should choose a pure sine wave inverter if you want to run any delicate or sophisticated equipment.

Related: Pure Sine Wave vs Modified Sine Wave Inverter: Which do You Need for Your Rooftop Solar

MPPT rather than PWM Solar Charge Controller

A solar charge controller is a device that regulates the flow of electricity from the solar panels to the batteries and prevents overcharging or undercharging.

Some off-grid inverters have a built-in solar charge controller, that do not require a separate one. There are two types of solar charge controllers: maximum power point tracking (MPPT) and pulse width modulation (PWM). MPPT is more advanced and efficient than PWM, as it can adjust the voltage and current to maximize the power output of the solar panels and extend the lifespan of the batteries.

You should choose an off-grid inverter with an MPPT solar charge controller or buy a separate one if your inverter does not have one.

Look for smart monitoring and programming features

Some off-grid inverters have smart features that allow you to monitor and control the performance and settings of your system. You can use a remote control, an LCD display, a smartphone app, or a web portal to access and adjust the parameters of your off-grid inverter, such as input and output voltage, current, power, frequency, battery level, load percentage, and error codes. You can also set the priority of the power sources, such as solar, battery, or grid/generator. You should choose an off-grid inverter with smart features that suit your preferences and needs.

Compare the Warranty and Price

The warranty and price of off-grid inverters can vary depending on the brand, model, quality, and features. You should compare the warranty and price of different off-grid inverters and see which one offers the best value for your money. You should also consider the installation and maintenance costs of your off-grid inverter.

SVC off grid inverters range from 5kW to 10kW which are the most popular sizes. All is built-in MPPT solar charger and with pure sine wave output. Support multiple communication: USB & RS232.

We are the off-grid solar inverter manufacturer in China and looking for the reseller and distributor.

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