Solar & portable power calculator

How much power do you really need?

Smart calculations for real life energy independence.

Free tools. Clear assumptions. Sources you can check.

Your estimated power need

Power your everyday essentials.

Typical device watts; check your label. Hours are planning assumptions.

FridgeAll dayWi-Fi routerAll dayLED lightEveningLaptopWork session

2,343 WhMedium–High

Suggested capacity with losses & reserve. Toggle the essentials below.

Not a model recommendation. Preset sources · Method

Manufacturer-sourced model specsEditable assumptionsNo hands-on testing claims

The right starting point

Plan around your own devices, your daylight and your budget.

Build a device list. Check capacity, continuous output and surge.

Estimate the hours, then check whether the compressor can start.

Explore yield and savings with your own local inputs.

Pick by situation

The field notes

Practical research, honest limits and the maths behind the answer.

Separate average draw from the compressor’s startup demand.

Work through outage essentials, a CPAP night and a camping weekend.

Panels, permissions, mounting and the battery question.

Choose by situation, with a practical buying and safety checklist.

Show your working

Battery Wh = daily device Wh × backup days
÷ inverter efficiency ÷ remaining usable fraction

We start with 85% inverter efficiency and a 20% reserve. Both are assumptions you can change. Inverter idle draw is added separately.