solar battery size guide
5 kWh vs 10 kWh vs 15 kWh Battery — Which Size Do You Need?
29 August 2026
Choosing 5 kWh vs 10 kWh vs 15 kWh is the most common solar battery question in Pakistan after price. kWh is stored energy. Inverter kW is how fast you can use it. You need both numbers to match a home.
A 5 kWh LiFePO4 pack is a typical starting point for essential loads: lights, fans, internet, TV, and a refrigerator for several hours. It will not comfortably run multiple 1.5 ton ACs through a long outage. If that is your goal, you need more storage and an inverter that can start compressor surge.
A 15 kWh bank is aimed at homes and small businesses that want longer backup or heavier evening load. It costs more and needs correct cabling. Pairing a large battery with an undersized inverter wastes capacity. Pairing a large inverter with a tiny battery empties the pack in minutes.
Use your bill units and a load list. The Voltrix solar calculator estimates panel, inverter, and battery size from units or appliances. Then open the products page and compare the 5 kWh-class and 15 kWh Voltrix LiFePO4 models. Request a quote so an installer confirms voltage, charge current, and whether you should parallel packs.
There is no universal “best size.” There is a size that covers the loads you refuse to lose, with a warranty you can claim in Pakistan. Voltrix Batteries in Islamabad can help you pick between compact home storage and high-capacity 15 kWh energy storage.
FAQ
Can a 5 kWh battery run a 1.5 ton AC?
It can for a short period if the inverter and discharge rate allow it. Runtime will be limited. Plan extra kWh if AC is a nightly requirement.
Do I need 15 kWh for a small house?
Not always. Lights, fans, router, and a fridge often fit a 5 kWh-class pack. Size up when you add ACs, pumps, or long outages.
Next step: browse LiFePO4 batteries and inverters or request a quote.