My boat has mostly been at the dock for the last few months, hooked up to shore power. The SOC on my house battery bank has slowly dropped from high 90ish% and is now at 88%. I thought there was a way to resync it to 100% but I cannot find the option in VRM anywhere.
Would appreciate instructions on how to do this properly.
The shunt will reset to 100% upon full charge assuming all settings are correct.
More importantly have you figured out why the SOC is dropping? Seems like that would be the first step.
I wouldn’t use the “Synchronize SOC to 100%” unless you are positive the batteries are actually 100%. You can set to a specific SOC or reset to zero. All can be done within the smartshunt settings and should be done with care.
The SOC slowly dropping is often a symptom of a charger being connected directly to the battery not the shunt so it is not counted, failure to sync properly or the charge efficiency factor is wrong. Here are a couple of links, the first is opposite to what you are seeing but it is useful reading. Also, post a screenshot of your shunt settings and battery type and we can check.
