solar charge time calculator

Solar Charge Time Calculator

Estimate recharge time from battery watt-hours, panel watts, station input limit, sun hours, and realistic solar derating.

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Optional station preset

Estimated solar recharge

3h 13m

Based on 300 W effective solar input after station limits and derating.

Refill target963 Wh
Daily solar1,350 Wh
Runtime offset16h 53m
Load coverageoffsets load
Solar output changes with shade, heat, clouds, panel angle, wiring, charge-controller behavior, and whether the station is already near full. Treat this as a planning estimate.

What To Check Next

Use With Runtime

Add the daily solar Wh to your load plan only when panels are deployed during usable sun hours.

Measurement Tip

Compare the station display's solar input against this estimate and adjust the derate until it matches your real setup.

Solar Planning Notes

Nameplate panel watts are not the same as delivered charging watts. Use a conservative derate until your real station display proves otherwise.

Station limit

A 600 W panel array still cannot exceed a 300 W solar input limit on the station.

Sun hours

Peak sun hours compress the usable day into equivalent full-power solar hours.

Runtime offset

Solar can extend runtime during the day, but it should not replace overnight battery reserve.