Live solar estimate, roof fit check, financial results, and full calculation steps. Enter values to see the full solar sizing and savings walkthrough. Use the calculator above to translate your energy needs into a right-sized solar array.
This inverter size calculator estimates solar inverter capacity, DC-to-AC ratio, and basic string configuration using PV module data, inverter topology, and approximate temperature effects.
The formula for calculating the PV System Capacity (kW) is: PV System Capacity (kW) = (Total Annual Electricity Consumption) / (Solar Panel Efficiency × Solar Hours per Day × 365 days) Where: Total Annual Electricity Consumption: The expected annual electricity usage in.
For example, 100Ah at 12V equals 1. Converting amp-hours to kilowatt-hours is straightforward once you understand the formula and why each component matters. Multiply amp-hours by voltage to get watt-hours, then divide by 1000 to convert to kilowatt-hours.