A USEFUL STARTING POINT

Less guesswork.
More understanding.

List your appliances and daily hours to estimate energy use. Adjust the assumptions to explore a preliminary battery and solar-array size.

Your appliance list

01 / Daily energy

Use actual nameplate or measured watts where possible. For cycling appliances, enter equivalent full-power hours rather than assuming they run continuously.

Preset watts and hours are illustrative estimates, not manufacturer specifications.

Make the assumptions visible.

Share of daily energy supplied by battery (%)Illustrative load split, not a guaranteed duration.

Usable battery fraction (%)Set from the actual battery specification.

Inverter efficiency (%)

Battery delivery efficiency (%)

Peak sun hours / dayExample scenario. Not measured Aba irradiance.

PV system derating factor (%)Includes array-to-AC delivery losses in this approximation.

Calculation boundary: battery capacity = selected backup AC energy ÷ (usable fraction × inverter efficiency × battery delivery efficiency). PV size = daily AC energy ÷ (peak sun hours × PV derating). The PV estimate is a simplified daily-energy baseline: it does not separately model battery charging losses, recovery after a multi-day outage, shading, seasonal reliability or string design. Extra generation may be required.

WHAT THE NUMBERS MEAN

An estimate. Not a promise.

Power is not energy.

kW tells you the load at a moment in time. kWh adds how long it runs. Inverter kVA also needs a power-factor and rating check.

Runtime varies.

Temperature, battery age, standby losses and changing loads influence the energy you actually get.

Real sites are different.

Roof conditions, seasonal sunlight and equipment compatibility require a proper design assessment.

YOUR NEXT CHAPTER, POWERED BETTER

Let’s start with what
you need to power.

A few details about your home or business. A clearer next step.

Plan your solar system

Less guesswork.More understanding.