Explain Like I'm Five | Don't Panic!

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ELI5: What happens when you join two lithium batteries with different amp hours? (lemmit.online)

submitted 1 year ago by [email protected] to c/[email protected]

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The original was posted on /r/explainlikeimfive by /u/GraceToo on 2023-06-26 18:49:53+00:00.

Edited to add more detail about the batteries in question

My van's solar/electrical set-up has a 100ah and a 170ah 12V lithium battery in parallel. I'm trying to understand why I'm suddenly having over-discharge problems and how easiest (and cheaply) to rectify the situation. The battery manufacturer simply says "it's bad". I hired two people to set up different aspects of the system but neither thought the mismatched amp hours were a problem; is it?

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[–] SpaceNoodle 1 points 1 year ago

Dude needs to ask some power engineers. I know enough to say that the current's not always flowing in the right direction with such a setup, but not enough to explain why. Dude needs to listen to the manufacturers; I don't need to ask some Internet randos if it's "bad" that I zip-tie my chainsaw into the "on" position while I sit on it.