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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?