but you do need at least two voltage monitors to get a first order (extremely coarse) balance monitor.
edit apparently the jld404 isn't isolated either, so you would need two of them and two isolated dc-dc. or you can reference both to ground but that will create an imbalance over time with the lower pack half having 2x the leakage current.
The documentation really needs an overhaul by a professional tech writer for that unit to be usable by laymen.
And the Chinese-cr^p hardware sourcing does not inspire confidence, do they really hold up over time? I'm not saying quality gear can't be produced in China, but in my experience it only happens when the foreign customer builds in and takes charge of monitoring stringent QA requirements, e.g. as with Apple
Victron is Dutch engineered, designed to last for decades in a harsh marine environment, and a lot more "user friendly", including good docs. And yes, why it costs over double the price.
It's really overkill for just voltage monitoring though. You can get up to 4 digit meters for 5 or 10 bucks and same for each isolated power supply.
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