Solar Water Pump Calculator
Size a solar water pump system for your farm or home in Pakistan.
About the Solar Water Pump Calculator
Built for Pakistani users, the Solar Water Pump Calculator turns a fiddly manual calculation into a one-glance result you can trust for planning and everyday decisions.
Not every appliance should run on solar — high-wattage, long-running loads drain batteries quickly. This Solar Water Pump 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.
The Solar Water Pump Calculator is one of a large, connected suite of Pakistani calculators on GuruAlpha, so if a related figure comes up next, the tool for it is a click away.
How to estimate solar runtime for an appliance
- 1
Enter the appliance's wattage.
- 2
Enter your battery capacity and system voltage.
- 3
Read the runtime in hours, updated live.
Frequently Asked Questions
How do I size a solar water pump?
Hydraulic power = head × flow × 9.81 ÷ 3,600. Add pump + motor losses (~50% efficiency) and array headroom. A 25 m head at 5,000 L/h needs roughly a 1 kW pump and 1.3 kW of panels.
How long can a solar battery run a fan?
A 70 W fan on a 200 Ah, 12 V battery (2.4 kWh, usable ~1.2 kWh at 50% discharge) runs roughly 15–17 hours. An AC, by contrast, would drain the same battery in under an hour.