Inverter Sizing Calculator
How to use this calculator: Enter your solar array capacity and load requirements to determine optimal inverter size.
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Our experts are here to help you make the right calculations. Calculate the optimal inverter size for your solar system. Determine the right inverter capacity based on panel array size, system configuration, and power requirements.
Your inverter size should match your solar array's capacity, not your electricity bill. This means your inverter doesn't need to power your entire home—it just converts whatever your panels generate. Let's say you have a 6kW solar array (twenty 300-watt panels).
Most UK homes need at least a 5 kW inverter. While 3.68 kW is common, larger homes or those with batteries benefit from a 5 kW+ system. What is a solar inverter? A solar inverter converts electricity between “direct current” (DC) and “alternating current” (AC). Electricity produced by solar panels and electricity stored in batteries is DC.
Undersizing allows your solar inverter to run closer to its maximum output for more hours during the day, which can improve efficiency. However, if your panels frequently produce more power than the inverter can handle (especially during peak sun hours), the system will clip that excess power—resulting in lost generation.
How to use this calculator: Enter your solar array capacity and load requirements to determine optimal inverter size.
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