Solar Calculator

Size your backup power

Enter your appliances and usage. Results update instantly and every assumption is adjustable.

1. Your appliances

ApplianceWattsHours/dayQtyWh/day

240

360

120

325

2. Assumptions

Battery capacity preset

Battery capacity (Wh)Usable efficiency (%)Inverter continuous rating (W, 0 = unknown)Peak sun hours (h/day)Solar system losses (%)

Disclaimer: This calculator provides indicative estimates only, based on the figures and assumptions you enter. Real-world performance varies with appliance surge draw, temperature, battery age, weather, shading and installation. It does not state the specifications of any COLA product. Always confirm ratings against official manufacturer documentation and consult a qualified professional before purchase or installation.