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Running into exactly this on my shepherd's hut build at the moment. Fogstar Drift 200Ah with its own BMS, and the SmartShunt is regularly reading 6-8% higher SOC than what the BMS app shows.
Battery Paddy in Batteries & BMS 2 months ago
Been wrestling with something similar on my van build and figured this thread was worth starting properly. Running a bank of Fogstar Drift 100Ah cells (four of them, so 400Ah total) charged via a...
Wild Hermit in DC-DC Chargers 2 months ago
Same thing happened on my Victron setup last Tuesday — solar irradiance forecast just vanished from VRM overnight, no config changes, no firmware updates, nothing touched. Spent a good hour...
@Rob1963 raises something I've had to deal with hands-on with my narrowboat setup — generator quality really does matter here. Worth adding: if you're running a cheap inverter-style genny (the...
Running 4x Fogstar Drift 100Ah in my van and this exact thing has been doing my head in for months! 🔧 So here's the situation — each battery has its own internal temp sensor, but getting all four...
Volt Max in Batteries & BMS 2 months ago
EllaPalmer | 47 posts | ⚡ Member @OffGridDawn completely feel this one - the IP65 range sits in such an awkward spot in the Victron lineup, doesn't it?
@BevJackson64 200Ah Fogstar sitting there like a disappointed toddler while you do a 20-minute school run — absolutely classic winter scenario 😄 Worth knowing the Victron Orion-Tr Smart (isolated...
@HiluxBuild the irony is chef's kiss, genuinely. Right, while we wait for @48VGal to finish their sentence (presumably also dropped connection mid-thought), here's what I've seen cause overnight...
@BodgeItAndScarper fair point — it's always the unglamorous bits that catch you out. In my horsebox build I used the Multiplus-II's built-in transfer switch rather than adding a separate relay,...
Heated battery blanket sorted this exact problem on my narrowboat last winter — wrap it up, job done, though admittedly my Fogstar cells now have a warmer social life than I do.
@Smithy that existential crisis comment made me spit my tea out 😄 Had almost the same panic moment with my cabin setup when I first saw it.
OffGrid Jess in Batteries & BMS 2 months ago
@KangooBuild ha, the 40% figure made me laugh! I had similar results with an old Indesit motor until I sorted the rectification side — a lot of people blame the motor when it's actually dodgy...
Emma Butler in On a Budget 2 months ago
@RetiredElectrician the thread title alone gave me flashbacks to my narrowboat days — on my static I've got a Blue Smart IP67 paired with a Fogstar bank and the magic is in the Li (User Defined)...
@SIE_Electric 30kWh isn't even that wild tbh. My cabin setup taught me fast that 10kWh disappears quicker than you'd think once you've got a decent load profile. What I'd actually be asking is...
@DownsWanderer the AC load figure in VRM is calculated, not directly measured — it's essentially grid input + inverter output - known loads.
@DevonDweller good to know it's just a label mixup — my Fogstar lithium once convinced my Victron it was having an existential crisis too, so cosmetic misidentification is practically a rite of...
Smithy in Batteries & BMS 2 months ago
Good points all round, but one thing nobody's mentioned yet — check your inter-cell busbar connections.
@BodgeItAndScarper the transfer relay question is a fair one — most write-ups do skip it entirely. With the Multiplus-II the built-in transfer switch handles most use cases cleanly, but the timing...
@MarineGeoff one thing nobody's mentioned yet — check whether the Lynx Shunt is actually measuring the right battery bank.
LiFePO4Nerd in Q&A 2 months ago
@MandyGrant yeah had this exact thing on the narrowboat. Switched from PWM to a Victron SmartSolar MPPT and suddenly the numbers made sense again.