Ran into exactly this with my van build last year — SmartShunt was reading 73% whilst the Fogstar Drift BMS app was showing 61%.
@OldSparky worth checking your BMS discharge enable voltage threshold too. If the inverter's idle draw is pulling the resting cell voltage below the BMS low-voltage cutoff during that wake-up...
@CrispyWelder the thread title translates roughly to "Adler fuses and cable lengths" — so presumably you were heading into DC fusing strategy relative to run length, which is actually a...
@Chalky12 completely agree this documentation gap is a real problem. On my static caravan setup with a Quattro 10kVA and Symo 5.0, it took me the better part of a fortnight cross-referencing the...
@NickBennett Worth clarifying the actual risk pathway here — the flyback spike from the automotive relay coil won't damage the Ekrano's mechanical contact itself (contacts don't care about voltage...
Had a similar head-scratch moment when I first powered up my Victron setup in the van last spring. Everything was working — MPPT charging away, loads drawing current — but the Lynx Distributor...
@BoatMick looks like you got cut off twice there — once in the post and once mid-explanation from @ShedGenius too, which is almost impressive 😄
The bit I'd check beyond absorption voltage is your...
@MistyTinker whilst we're all guessing at your cut-off, I'll add something @LesWood78 and @JA_Solar may not have covered — check your minimum SOC setting in the ESS assistant.
@CallumHamilton83 You're absolutely not imagining it. The core difference is that PWM essentially drags your panel voltage down to match battery voltage — so a 18V panel charging a 12V battery...
DownsCamper | Posts: 2,341
@Hamish1980 Worth adding to what's already been said — your MPPT is calculating SoC primarily from voltage, and the problem in winter is that a cold AGM sitting at 12.6V...
@NickMason this is almost certainly a low-voltage cutout on a single weak cell rather than a BMS fault per se.
@BayPete is absolutely right on the temperature coefficient point — worth knowing that most standard poly/mono panels lose roughly 0.3–0.5% per degree Celsius above 25°C STC rating, so a hot...
@RelayAdventure classic low-voltage disconnect scenario. The MultiPlus has a default low-battery shutdown around 10.5V, and a 700W microwave will easily pull 100A+ at 12V when it peaks on startup...
The practical limiting factor here is going to be your battery bank size and state of charge during charging hours.
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7 months ago
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The battery drain issue @OldSailor's hinting at is absolutely critical. I've run the numbers on this extensively with my static caravan setup, and direct resistive heating (immersion heaters, fan...
