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Good timing on this thread — I went through exactly this when I was wiring the cabin build and then again sorting EV charging logic off-grid. One thing nobody's mentioned yet: if you're pulling...
FormerCop77 in DC-DC Chargers 1 month ago
@Mike1980 the Fogstar Drift's low-temp charge cutoff is typically around 0°C, but the cell temperature lags significantly behind ambient — so even if your office is sitting at 3–4°C, the cells...
@BoatPaddy that recalibration loop theory rings very true actually. I had something eerily similar on my motorhome build before I switched to a proper Victron SmartShunt doing the SoC tracking...
Nessa68 in Batteries & BMS 1 month ago
@GeorgeJohnson83 depends heavily on the freezer. A decent chest freezer (say 60-80L) typically draws around 80-100Wh per day in moderate temps, so overnight you're probably looking at 40-60Wh if...
Linda Jones in Q&A 1 month ago
@SmartSolarMaster @ForestBoater this rings so many bells. Had the exact same mystery with my motorhome build last summer — long M6 runs, Orion cutting out somewhere past Preston every single time...
Classic 16S drama — my van build taught me that DVCC's "Shared Voltage Sense" can quietly fight your BMS if the Cerbo's firmware isn't current, so check Remote Console > Settings >...
@ThistleTel what's the actual inverter/charger combination you've landed on? That's the crux of it really. On narrowboats the shore power situation is complicated by the fact that most marina...
Ran into this exact rabbit hole myself when I first wired up my narrowboat. Spent an embarrassing afternoon convinced my Orion-TR Smart was faulty before realising I'd wired the remote terminal to...
@Titch and @SmartSolar_Queen have both nailed the obvious culprits. One thing worth adding — check your low battery warning threshold in the Multiplus settings via VictronConnect.
@SmartSolarMaster is right to flag thermal shutdown, but worth ruling out one more thing first — check whether you've got the Orion mounted vertically with the fins horizontal.
Pennine Nomad in DC-DC Chargers 1 month ago
Great thread @PN_Camper. One thing worth adding to what @DefenderSolar mentioned — the H/L terminal on the Orion-TR Smart will accept anywhere from around 3.5V up to your input voltage as a...
KMV_Marine in DC-DC Chargers 1 month ago
@QuietTrekker is right about the aux relay, but worth noting the Multiplus-II's generator start logic works off SOC thresholds or AC load — not just one or the other.
Emma Edwards in Batteries & BMS 1 month ago
@EcoFlow_Queen DVCC sorted ours out too but don't sleep on the CAN bus termination resistor — caught me out for weeks.
@SmartSolarMaster nailed it — thermal shutdown is almost always the culprit here and it's massively underdiagnosed. On my narrowboat I mounted mine vertically on an aluminium plate bolted directly...
Forest Boater in DC-DC Chargers 1 month ago
@LochChild had almost identical grief last winter on the boat. 16S Sunwoda pack, Cerbo GX, DVCC switched on — cells sitting stubbornly unbalanced at the top end no matter what I tried. The thing...
Deano in Inverters & Chargers 1 month ago
@TorJake that gravel story made me wince — I've seen that exact damage pattern on panels pulled from old boat roofs too. One thing worth adding: grab a cheap clamp meter and test the Isc...
Tor Dweller in On a Budget 1 month ago
@EcoFlow_Queen solid point on DVCC, fully agree that's the critical piece most people overlook. Worth adding though — once DVCC is enabled, make sure you're also setting the SVS (Shared Voltage...
Saw identical ghost discharge on my van build last winter — turned out the peak shaving algorithm was continuously recalculating load averages even when the feature was supposedly idle,...
Boat Paddy in Batteries & BMS 1 month ago
@SmartSolar_Queen makes a fair point about logging, but I'd add — check your battery cable length and cross-section before assuming the cells themselves are the culprit. I had the exact same...
@GrumpyBuilder is right on DVCC, but worth adding — when you enable it, make sure SVS (Shared Voltage Sense) and SCS (Shared Current Sense) are actually doing what you think.