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Inverter Sizing Calculator

Determine the right inverter size for your solar array and load profile — including DC-to-AC ratio and MPPT channel recommendations.

Continuously maintained3 min read Focus Solar Editorial Team Reviewed for technical accuracy through the Focus Solar editorial process

Enter your panel array capacity and peak AC load to calculate the minimum inverter size and check your DC-to-AC ratio. The calculator flags configurations outside the recommended range and suggests adjustments.

YOUR INPUTS

Estimate inverter size

Adjust the assumptions. Results update immediately.
kW DC
Range 0.5–100
kW AC
Range 0.2–100
ratio
Range 0.8–1.5
Planning estimate only

How to use this estimate

This result is an early decision aid, not an approved electrical or structural design. Weather, shading, orientation, equipment efficiency, local rules, and actual product specifications can change the outcome.

Regional differences: Costs, taxes, incentives, tariffs, and grid rules vary by location and over time.

Read the calculation methodology →