in my view ...: Shed Battery LFP

Monday, 2 November 2026

Shed Battery LFP

Back in August I wrote about the need to replace my shed 24V battery; which feeds an inverter and is fed by a solar panel. That little freebie was basically insufficent for heavier roles but got me by. I am however wondering if I've gone too far with my choice to go 100Ah 24V LFE, but I don't think so. Anyway, my cells arrived the other day and so I've put the pack together and thought others may appreciate some notes.

They look very neat and well finished, and so I wanted to weigh them, this is 4 cells on the bathroom scale.

Which means that they're a lot lighter than my Lead Acid which weighs in at 13.88kg per 12V.

I decided to arrange them in a side by side (similar to what I'd done with my Lead Acids).

unfortunately the metal strips supplied were not quite long enough to reach across and so I needed to use a cable. I'm not sure at this point if I'll keep that or change it to some solid copper.

Next I added the balance wires for the BMS harness

and its noteworthy that this arrangement is missing a wire when using the Jikong BMS as this also needs a sensing wire for the whole pack.Its on the second plug and separated from the remainder of the wires. Its important because the system will not function properly without it.

here it is attached to the last positive... and pictured with both loom parts plugged in ...

I would have liked to "de-pin" the un-needed wires, but they're stuck in with resin. So I've just bundled them up and put heat shrink over the bare pre-tinned tips for the possibility of use at a later date if I decided to take this pack into 48V territory (making a 4.8kWh pack).

All is functioning well on the bench test... ... plugged into the solar panel (via the solar charge controller). I don't think however it'll get to much higher voltage than that because my panel seems to be the limiting factor (in combination with the slow climb after 3.4V with LFP.