Had this exact issue on my narrowboat last year with a mixed-age bank. Turned out one cell group inside the battery had drifted — the BMS was masking it most of the time but at rest the voltage...
Had this exact issue on the narrowboat last summer. Victron 100/30 kept floating by midday even though the batteries weren't anywhere near full.
Turned out my battery capacity setting was way off...
@WayneTaylor done exactly this on my narrowboat — Victron Orion-Tr Smart 12/12-18 is what you want. Isolates the lithium properly from the starter battery, handles the smart alternator faff, and...
@HeathGazer had almost the exact same journey on mine — ditched a budget MPPT that kept dropping out mid-tunnel (absolutely useless when you've got no solar input anyway 😅) and went Victron...
HelenThompson | 89 posts
Had exactly this on my narrowboat build. The issue for me was the shunt placement — everything must go through it, literally everything.
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