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How to Monitor Pack?

880 Views 8 Replies 5 Participants Last post by  Ziggythewiz
Have a 96volt lithium pack. Bottom balanced. No BMS. What would be the simplest, most cost effective (meaning cheap), way to monitor output from pack to know when I have reached bottom limit?

I like the Victron monitor using a shunt, but it only reads to 90volts.
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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.

http://www.electricsubaru.com/fuelGauge.html
 

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JDL404 really great meter 69 bucks for meter, 40 bucks for shunt
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.
 
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