The typical inverter sizes used for residential and commercial applications are between 1 and 10kW with 3 and 5kW sizes being the most common. With such an array of options, how do you find the right size for you? An inverter works best when close to its capacity. Let's say you have a 6kW solar array (twenty 300-watt panels). Your inverter needs to handle that 6kW of DC power, regardless of whether your home uses 2kW or 10kW at any given moment. Equate Load Requirements, Not Panel Watts It's not. Solar inverters convert the direct current (DC) electricity produced by solar panels to alternating current (AC) electricity, which is used to power home appliances and electronic devices. While there are several types of inverters including hybrid, grid-tie, and off-grid inverters they all perform. For big projects—such as 100kW, 500kW, or even multi MW construction—many buyers struggle to calculate inverter quantity. Typically, you only need one inverter for your solar panel system, but for larger setups, you may need multiple inverters or microinverters to optimize power conversion.