Solar

Solar Panel Charging Calculator

Estimate solar production and battery charging time.

Battery capacity, WhSolar panel wattage, WPeak sun hoursSystem efficiency, %

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Guides and explainers that help the calculator output make more sense.

Learn the simple math behind daily solar production and battery charging estimates.

How to think through battery size, charging options and realistic camp loads.

The practical tradeoffs behind panel wattage, storage and charging consistency.

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FAQ

Quick answers that help set expectations before you use or save this tool.

What are peak sun hours?

Peak sun hours are the equivalent number of hours per day when sunlight intensity is strong enough to produce near-rated panel output.

Why is real charging slower than the panel rating?

Panel angle, heat, wiring, controller losses and weather all reduce real output, which is why efficiency matters.

Can I use this for a portable solar panel?

Yes. It works for portable panels, roof panels and folding solar kits.