Choosing a Battery to Run a Solar Water Pump

In depth

High-current LiFePO4 packs suit these loads better than gel, because voltage sags less under load and the inverter is less likely to trip at startup.

Sizing: pump kW x pumping hours / depth of discharge. A 2.2kW pump running four night hours needs about 9.8kWh of lithium.

On many farms it is cheaper to pump during the day straight from the array and store water in a tank rather than store electricity.

Related products with specs and prices

Common mistakes to avoid

• Comparing amp-hours only and ignoring voltage, ending up with four times less energy than needed
• Discharging lead acid below 50%, which cuts life to less than half
• Picking a bank that does not match the inverter voltage, so charging fails or runs inefficiently
• Thin cable or a long run between bank and inverter, causing voltage drop and lost power
• Mixing new and old packs, or different capacities, on the same bus

Next step

Send your load list and required hours over WhatsApp, or use the on-site system calculator to size the battery bank and array.

Technical advice is free, and the recommendation is based on your real consumption, inverter voltage and installation location rather than on the largest battery in stock.

Frequently asked questions