Smartshunt shows impossibly high negative current

DIY
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3

Readings like this are often due to wrong wiring and on vehicles incorrect chassis ground. Have you got a connection from the batteries to the chassis. If you have then this should be on the load/system side of the SmartShunt, not on the battery. See the FAQ mentioned in the top sticky post of the DIY category.

https://community.victronenergy.com/t/shunt-battery-monitor-not-reading-the-correct-soc-amps-missing-solar-decreasing-daily-or-other-misreading-problems/87