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Cool project! But. . .

Actual voltage at a given SoC fluctuates wildly depending on current loads when the bank has not been at rest for many hours.

If you want voltage, just install a super cheap volt meter on a momentary switch.

If you want SoC, best accuracy is Merlin (Balmar) SmartGauge, but for lead only. Or a Victron 702-BMV, or Bogart Trimetric many other coulomb counters will get pretty close.
 

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I would never let a lead bank drop that much while in storage, if not sitting always on floatV from a quality charge source, would top up manually at least every 2-3 weeks.

But that's me, looks like an interesting project!
 
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