Solar Fan Calculator

Not every appliance should run on solar — high-wattage, long-running loads drain batteries quickly. This Solar Fan Calculator estimates how long your solar battery can run a specific appliance, so you plan your power priorities during outages and at night.

The calculation divides the battery's usable capacity by the appliance's consumption to give runtime, accounting for the depth-of-discharge limit of the battery type.

The order of priority for most Pakistani homes: fans and lights first, then the fridge (intermittent), then TV and internet, with heavy loads like ACs and heaters only on large systems. This calculator quantifies what each choice costs in battery.

Run the tool for each appliance you plan to power — the numbers will show you quickly why a small battery struggles with an AC but handles fans and lights for many hours.