Free planning tool

Solar inverter sizing calculator

Pick the appliances that might run simultaneously and we'll add a 1.20–1.30× safety margin per industry practice.

  • Inverter kW = peak simultaneous load × safety margin (PRD §10)
  • Default margin 1.25×, admin-tunable
  • Pairs with the battery calculator for hybrid / off-grid systems
  • Shows the impact of margin choice on installed cost

Results are planning estimates. A licensed installer site survey is required before purchase.

Deterministic engine

Same PRD §10 formulas every run. No black-box AI in the sizing path.

Transparent confidence score

See exactly which inputs lifted or capped your score (PRD §11).

Verified installer marketplace

Optional: request quotes from installers vetted in your country.