How to Size Off-grid Solar Inverters

What is an off-grid solar inverter

In recent decades, many homeowners and business owners have switched to solar power systems, especially to the off-grid solar system, the most common type. The off-grid solar inverter is one of the key components in the off-grid system.

As the name implies, off the grid, off-grid solar inverters are the inverter for solar panels which can operate independently. This type of inverter normally does not connect to the utility. It needs power from the batteries.

How to determine inverter size

Firstly, consider the size of a solar array. Because solar inverter converts DC electricity coming from the array, it needs to have the capacity to handle all the power the array produces.

The size of the PV inverter should be similar to the DC rating of the solar array. The ratio is typically not higher than 1.55. The majority of installations will have a ratio between 1.15 to 1.25; For example, if the solar array is 5 kW with a 5000 W inverter, the array-to-inverter ratio is 1. If you install the same-sized array with a 4000 inverter, the ratio is 1.25.

What is the difference between off-grid and on-grid solar inverters

The on-grid solar inverter does not need additional batteries, while the off-grid solar inverter needs.

On-grid solar inverters can be directly connected to the utility, while off-grid solar inverters cannot.

Advantages of off-grid solar inverters

• Energy independence. Installing an off-grid solar inverter at a home, office or industrial area would make it self-sufficient when it comes to the accumulation of energy.

• Easy installment. The equipment that is required for the installation of off-grid solar power systems does not have to depend on the grid, and therefore, the process of installation is quite straightforward, without the need to rely on complex infrastructure to function.

• Money Saving. The off-grid inverter set users free from rising electricity bills.

• Stable power supply.

Disadvantages of off-grid solar inverters

• Limited energy storage

• No Backup Energy Source

Best off-grid solar inverters

Here, we’ll introduce a new type of off-grid solar inverter, which greatly solve the cons of off-grid solar inverters. The all-in-1 solar inverter VMH & VML series. It is a multi-function inverter integrating solar charger, battery charger, and inverter into one unit.

✅Pure sine wave output

✅Built-in mppt solar charge controller

✅Selectable high power charging current 

✅Compatible generator power input

✅Automatically turn on after the mains is restored

Please find our all solar inverter here: SVC Solar Inverter