Capacity Test on 48v Battery without Inverter

Batteries and Chargers Rechargeable Batteries
1

I have a 48v 20Ah battery (LiFePO4) that I need to test the capacity at at least 20Amps.

It’s no problem with my 12v 100Ah battery because I can use my dummy load tester at 10Amps for that Watts = 12v x 10amps = 120watts
But with the 48v battery watts = 48v x 2.5Amps = 120watts.

I don’t have anything in my toolbox that can do that. Not at 20 amps.

I do have a few of those 150amp battery monitors and a few others with shunts, but nothing specifically for a 48v battery.

What’s the easiest way to do this given the above? Resistors? Shunt?

Thanks

2

Thanks just the same :+1:

It’s just current at 48v so it’s mostly just math and picking the right resistors.

I’ll figure it out or ask at an electronics forum.

3

You might have better luck asking on this Forum

4

Go to the thrift store and buy some used stove eyes. Four of them wired up in parallel should get you down to the 2.4 Ohm range.

eyes

5

Hey, hadn’t thought of those. That might be a workable idea

Thanks