Solar Panel Sizing

You need to know:  how much energy needs replacing in the battery battery voltage solar output in your area

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Battery Capacity

How do you know how much is left in a battery?

If solar panel more than 5  watts use a charge controller

MPPT controllers are 30% more efficient than PWM

Irradiance varies by location, average value is 4 peak-sun-hours/day

Measure battery volts to find Depth of Discharge

Solar panel power depends on the sun's energy in peak-sun-hours/day - this is irradiance

ALWAYS use a controller!

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