12V Water Pump Battery Use Calculator
How much battery does the water pump really use?
A 12V water pump only runs while water flows, so its battery use depends on how many litres you use. Everything is worked out in your browser. Nothing is saved or sent anywhere.
1. Water and pump
Pump flow and current are on its label or spec sheet.
2. Results
How it was worked out
What this does and doesn't tell you
- Real flow at a tap is often below the pump's rated flow, so the pump runs longer.
- A pump that keeps cycling with the taps off usually has a leak or a worn check valve.
- Work on 240V AC wiring, including inverter outputs and mains inlets, must be done by a licensed electrician. For high-current DC gear, follow the maker's installation manual and have an auto electrician check your work if you're unsure.