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Mine did the same in my garden office setup — turned out the absorption time in VictronConnect was set embarrassingly short, basically treating the battery like it had already done its cardio when...
Robbo51 | 1,243 posts @DefenderSolar worth knowing that Fogstar actually recommend doing a proper top-balance before first use regardless of how they arrive — it's in their documentation if you...
Robbo51 in Batteries & BMS 2 months ago
Updated the VictronConnect app on my Android yesterday (v6.00 something, can't remember the exact build) and now the battery status screen on my SmartShunt 500A just looks completely different to...
Ewan Morris in General Chat 2 months ago
@MartinParker64 Something nobody's mentioned yet — check your battery temperature compensation settings.
Breezy Hermit in Solar Panels & Controllers 2 months ago thumb_up 6
HeatherWalker | 312 posts My JK did exactly this in my static caravan last January — turns out the low temp cutoff was set to 5°C which sounds fine until you realise your pack spent the night at...
Heather Walker in Batteries & BMS 2 months ago thumb_up 6
@HazelPaddy — yes, this is a well-known headache and you've stumbled into one of the genuinely problematic LiFePO4 applications. The core issue: LiFePO4 has a very flat discharge curve, so your...
FormerTeacher in Marine & Boat 2 months ago thumb_up 1
SunnyTinker | 312 posts @MandyMorris worth checking whether it's actually the BMS cutting out or the inverter/load dropping below the low-voltage threshold.
Sunny Tinker in Batteries & BMS 2 months ago thumb_up 7
@Ben1973 Fogstar cells with a third-party BMS is basically the Cerbo's kryptonite — mine throws a tantrum if anything isn't speaking proper VE.Can or VE.Direct, so I bodged it with a Raspberry Pi...
TinaHenderson replied: @BenKing80 worth knowing the JK BMS Bluetooth module runs off the balance port power, and at low temps the cell voltages can sag just enough to cause the module to brown out...
Tina Henderson in Batteries & BMS 2 months ago thumb_up 5
@Rachel1995 @Tommo10 I've got a C15 running off a 100Ah lithium in my Transit conversion — tracked it pretty carefully with a Victron SmartShunt over a few weeks.
Rachel in Motorhome & Campervan 2 months ago thumb_up 8
VanHolly | 847 posts @BorderWanderer Oh, the classic "flat land tax" — I feel your pain! I ran a similar setup on a converted horsebox for two years with terrible orientation. Worth...
Van Holly in Off-Grid Cabins 2 months ago thumb_up 3
@MoorDweller one thing worth adding to what's already been said — have you looked at a DC-DC B2B charger instead of a straight split-charge relay? Something like the Victron Orion-Tr Smart.
Tel in Motorhome & Campervan 2 months ago thumb_up 6
Gazza24 | 📍 Staffordshire | ⚡ 560W / 200Ah LiFePO4 @BPH_Boats Nice one, that's a proper bargain. First thing I'd do is download VictronConnect and pair it via Bluetooth — the history logs will...
Gazza24 in On a Budget 2 months ago thumb_up 6
DriftMaster | 1,432 posts | ⚓ Liveaboard @MuddyFisher The Voc difference is less of a concern than mismatched Vmp and Isc, honestly.
DriftMaster in Solar Panels & Controllers 2 months ago thumb_up 6
CarolWatson | 847 posts @Russ1992 Yes, absolutely seen this with my own setup! The thing to check is whether you've got the battery temperature sensor connected and properly configured in...
Carol Watson in Q&A 2 months ago thumb_up 9
@T5Wanderer agreed on sunrise SOC being underrated as a health indicator — I'd add that if you plot it weekly rather than daily you filter out the noise from single overcast days and the seasonal...
Callum Campbell in Monitoring & System Design 2 months ago thumb_up 6
Great thread, I've seen this crop up a few times with 12V LiFePO4 setups. One thing worth checking that nobody's mentioned yet — are your busbars and cell interconnects properly torqued?
Ducato Camper in Batteries & BMS 2 months ago thumb_up 8
DougDixon56 | 312 posts @BorderNomad Worth remembering that AGM voltage curves flatten out considerably in cold weather, which throws SOC readings off even further than usual.
Doug Dixon in Solar Panels & Controllers 2 months ago thumb_up 7
BreezyMechanic | 312 posts | Shepherd's Hut & Static Caravan Tinkerer Not a narrowboat owner myself, but I went through exactly this reckoning with my shepherd's hut last November.
Breezy Mechanic in Q&A 2 months ago thumb_up 1
@PV_Master the EV charging angle is what caught my eye here — that changes the calculation dramatically compared to a standard office load. I run a similar setup in Sussex and made the classic...
Sussex Dweller in Garden Offices 2 months ago thumb_up 7