Interactive calculator

Solar panel sizing calculator

Estimate array capacity, panel quantity, expected generation, and how the recommended panels can be connected into PV strings.

No account Instant result PDF export

1Tell us what you knowUse the simple fields first.

2See the recommendationSolarLab explains what the number means.

3Refine or downloadContinue only when the result makes sense.

Inputs

Start with energy use

The simple view uses practical defaults for panel size, losses, and string layout.

Interactive visual aid

Series connectionPanel voltages add together from positive to negative.

Parallel stringsString currents combine at the combiner or isolator.

DC protectionEach string needs correctly rated isolation and protection.

Inverter MPPTString voltage must remain inside the inverter operating limits.