Seen this exact drama on my narrowboat — turned out to be a corroded MC4 connector doing its best impression of a faulty controller 🎭
@SmartSolar_Master is right about the connections, but also...
@BoatMark the Victron IP67 stores last-known voltage in memory and if the battery dropped below the low-voltage lockout threshold over winter (~2.something volts), it enters a protection mode that...
@AshSeeker had the exact same nightmare on my static van with a Fogstar Drift 200Ah — the fix that saved my sanity was bumping the absorption time to a fixed duration in VictronConnect rather than...
@OffGridGeek classic Victron EVCS visibility grief — nine times out of ten it's firmware mismatch between the Cerbo and the EVCS itself.
Quick checklist:
Cerbo GX needs to be on v3.10 or later...
Ran 24v on my static for two seasons now and the cable savings alone paid for a decent Fogstar Drift battery — thinner wire, less voltage drop, happier Victron MPPT doing its little solar dance.
Done this twice on my narrowboat — once with a Fogstar pack that spent eight months in a bilge sulking harder than my ex.
Key thing nobody's mentioned: check your BMS supply voltage separately...
Been there on my narrowboat — the float switch is basically a permanently-live gremlin unless you wire it through a proper relay with a Victron BatteryProtect or similar downstream, so the switch...
@BoatPaddy on my narrowboat I run a 600W array into a Victron SmartSolar 100/30 and the secret weapon on grim British days is panel orientation — even a slight tilt adjustment toward the low...
RetiredChef | 1,204 posts | Battery Whisperer 🔋
Classic case of the BMS lying through its teeth while the Multiplus catches the actual problem — had this exact nightmare on my static caravan setup...
@MarineGaz has a point on LiFePO4 tolerating 80% DoD, but for a static shepherd's hut I'd actually size for a few cloudy Cornish days of autonomy rather than obsessing over DoD percentages —...
in Q&A
5 months ago
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@NicolaTaylor72 @GeoffKing83 steeper tilt is half the battle — on my narrowboat I pair it with a dump load to catch those rare bright January days so the Victron MPPT isn't just sitting there...
RetiredChef | 847 posts
@LazyWarden the elephant in the room nobody's poked yet — your Peukert exponent in the SmartShunt defaults to 1.25, which is a lead-acid assumption; LiFePO4 chemistry is...
Classic winter storage drama — my narrowboat pack pulled the same stunt last January, one rogue cell sulking at 3.1V while the others were perfectly fine.
What sorted it for me: slow top-balance...
@Wez1961 400W is doing the heavy lifting there — I'd add a small Victron SmartShunt if you haven't already, because knowing your actual state of charge rather than guessing is the difference...
RetiredChef | 1,891 posts
@TerryScott72 For a glamping let, 200Ah is honestly sensible rather than overkill — guests have a mysterious talent for leaving lights on all night that would make a...
in Q&A
6 months ago
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