Power Station vs DIY Battery Box: Which Is Cheaper?

The quick answer

A DIY battery box usually gives you more usable power for your money and is easier to repair and upgrade. A power station costs more per watt hour but works straight out of the box, with a built-in inverter and charging. Choose based on how much you value convenience over cost.

Power station: all-in-one

Battery, inverter, charger and BMS in one box.
Plug and play, with nothing to wire.
Built-in mains (240V) outlets for laptops, drones and small appliances.
Higher cost per usable watt hour.
Capacity is fixed unless you buy the maker's expansion batteries.
If one part fails, the whole unit usually goes back for repair.

DIY battery box: build your own

Lower cost per usable watt hour.
Choose your own battery size, outlets and charger.
Easy to repair and upgrade one part at a time.
Can be built around a slim or larger battery to suit your space.
Needs basic electrical skills, the right tools and time to build.
Add an inverter separately if you need 240V.

Compare them properly

Compare cost per watt hour, not just the sticker price. Divide the price by the usable capacity in watt hours. A 12V 100Ah LiFePO4 battery stores about 1,280Wh. Power stations list their capacity in watt hours on the box.

Then add what each option needs to be useful for you, such as solar input, a DC-DC charger for driving, extra outlets or an inverter.

Things people forget

12V output limits. Many power stations limit their 12V car socket to around 10A. That's fine for most fridges, but check before running bigger loads.
Charging while driving. Charging a power station from a car's cigarette socket is often slow. A DIY box with a DC-DC charger can recharge much faster.
Inverter losses. Running 12V gear through a 240V inverter wastes power. Use 12V outlets for 12V gear where you can.
Weight. Large power stations can be heavy to lift in and out of a vehicle.

The verdict

If you're handy with a crimper and want the most power for your money, build a box. Our beginner tool kit guide covers the tools you'll need. If you want it to just work, or need 240V outlets often, buy a power station.