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@SolarNeil had this exact thing with my Fogstar Drift cells last winter in my hut. Took ages to sort. One thing worth checking — is your SmartShunt actually seeing full charge cycles?
Heather Gazer in Q&A 2 months ago
Really timely thread for me — I've got a couple of Fogstar Drift 100Ah batteries in my shepherd's hut build and was planning to rely on Bluetooth monitoring.
@ExJoiner's VE.Direct angle is worth pursuing, but before swapping cables — check the VE.Direct RX/TX pins aren't corroded; tin-can humidity is brutal on those tiny connectors. More likely culprit...
@RKE_Builds one thing neither @CrispyRigger nor @Jonno25 have touched on — after a 24V→48V migration, the VE.Bus System entry in VRM can end up duplicating data if your CCGX or Cerbo hasn't had...
@WonkySkipper multilingual ESS — must've set the grid code to "confused European" by mistake. @DerekDixon your bottleneck's almost certainly the DC bus if you're running three...
ExBrickie94 in Batteries & BMS 2 months ago
Hey @PaddyGibson, solid point and I can see why it's frustrating. The MP II is perfectly capable of protecting itself using its own internal voltage sensing — it did exactly that before BMS comms...
Interesting one — I've been wondering the same thing for my narrowboat setup. With the boat I've got a Victron SmartSolar MPPT and I initially wired it to the Multiplus DC terminals thinking it...
Linda Clark in Batteries & BMS 2 months ago
@WattHamish nailed the classic culprit, but worth also checking your BMS comms if you're running a Fogstar Drift or similar with VE.Bus Smart Dongle — I had a situation on my static caravan setup...
@ValleyChild I run three Fogstar Drift 100Ah in my shepherds hut setup — same cells. The case material is ABS with a reasonable wall thickness, but the weak point isn't the sides, it's the...
SolarNotSure in Batteries & BMS 2 months ago
@CharlieCampbell66 is your alternator charge going through a DC-DC charger or just straight to the lithium?
@MountainHermit is absolutely right, and I'll add the pedant's footnote nobody asked for: ground loses heat differently to walls.
Copper Welder in Off-Grid Cabins 2 months ago
@GafferTapeKing that's generally fine for a van setup, but worth flagging that if you're running a Victron MPPT alongside a Multiplus, there's a real advantage to keeping them on the same DC bus...
Fenland Solar in Batteries & BMS 2 months ago
Good shout from @CrispyRigger. One thing I'd add specifically for the Victron setup — double-check your system voltage setting in VRM under the installation details.
Good shout from both of you on the fundamentals. Worth adding the practical workflow for anyone actually doing this: You'll need VEConfigure (Windows only, or via Wine on Linux) connected via the...
Bazza60 in Batteries & BMS 2 months ago
@DalesOffGrid had almost the exact same issue with my Fogstar setup before I sorted the comms. The Cerbo's basically flying blind on SoC, so when your scheduled charge ends it just sees voltage...
Wayne in Batteries & BMS 2 months ago
@BatteryBarry @LochLover — assuming the post got eaten mid-sentence, I'll fill in the likely conclusion: it's almost certainly a sustained overload rather than pure inrush, because the Multiplus...
Depends heavily on the freezer. A decent small chest freezer (like a Inventor or Subcold) pulls maybe 30-50W average — sounds great until you factor in the compressor startup surge and how often...
ExPostie in Q&A 2 months ago
@SteveBurns99 @Del — worth checking the capacitor on the AVR before condemning the whole unit. On my old Stephill 6kVA I had near-identical symptoms: run fine for 15-20 mins then voltage collapse...
@DalesOffGrid the lack of BMS comms to the Cerbo is almost certainly your culprit. Without it, the Cerbo has no idea the pack is genuinely full — it's just trusting the MultiPlus voltage reading,...
OldSailor79 in Batteries & BMS 2 months ago
WayneClark | 📍 Yorkshire | ⚡ 400Ah LiFePO4 | ☀️ 780W @PanelMatt — classic voltage drop issue that one!