Sunshine if you already have a Victron solar charge controller I would highly recommend picking up a BMV-712 battery monitor. There are cheaper battery monitors available however the Victron integrates seemlessly with other Victron equipment and the BMV comes with a built in output relay that can be programmed to perform a plethora of actions that may be useful to you as you learn more. The BMV will display voltage, current as well as SOC. It also displays total amp hours in/out.
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SOB
2015 Volvo VNL780 D13, iShift, 32k ET air hitch, Idle Free LiFePO4 APU
16.8KWhr LiFePO4, 2.52 kw solar, 10kva Victron split phase
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