How to Size Inverter for Solar System?

First, are you need a solar inverter? If you are going to install with the solar power system, then yes. As the electricity produced by solar panels is direct current while the most home appliances are only run properly with alternative current. That is solar inverter comes which converting the DC current to AC current.

Inverter come in different sizes. For residential and commercial solar, the most common inverter sizes are range from 1kW-15kW. An inverter should work best when close to its capacity. Thus with such an array of options, how to find the right inverter size?

The next step is that how to size inverter for your solar system?

Step 1: Determining Your Power Needs

To figure out your power needs, measure the total energy consumption of the appliances you plan to run on solar power. The simplest way to do this would be to look at your daily energy consumption.

Step 2: Calculate the Total Power Output of Solar array

Next step is to calculate the total power output of your solar array, which is the sum of the wattage of each individual solar panel. For example, if you have 10 solar panels that are 300 watts each, your total power output is 3,000 watts (10 x 300W = 3,000W).

Step 3: Account for System Losses and Derating Factors

The second step is to account for system losses and derating factors, which are factors that reduce the actual power output of your solar array. Some of these factors include temperature effects, voltage drop, dirt accumulation, shading, and seasonal variations. To account for these losses, you need to multiply your total power output by a derating factor, which is typically between 0.85 and 0.9. For example, if your derating factor is 0.9, your derated power output is 2,700 watts (3,000W x 0.9 = 2,700W).

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