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Been through something similar with my cabin setup and it's worth sharing here. When I first wired up my 4 × 280Ah cells in parallel (Fogstar Drift units, so slightly different beast), the top...
Watt Helen in Batteries & BMS 2 months ago
Really familiar with this one — I had the same issue last summer on a long run down to Cornwall. Worth checking whether anything's shifted to partially block the airflow around it, even something...
Jess in Motorhome & Campervan 2 months ago
Had this exact issue on my previous van build. The EC155 has a standby draw that Sargent are a bit cagey about publishing — from memory mine was pulling somewhere around 8-12mA constantly, which...
@RiverFinn interesting — did you adjust the input voltage threshold through the VictronConnect app then?
Nobby in DC-DC Chargers 2 months ago
Been mulling this one over with my own Victron setup and reckon it's worth a proper chinwag here. Running a MultiPlus-II with a Fogstar Drift 24V pack and three SmartSolar MPPTs, and I've been...
Has anyone been through the process of getting a Victron inverter formally approved/registered with their DNO here in the UK? I've got a static caravan and a separate garden office on my plot, and...
Boxer Project in Q&A 2 months ago
Just finished swapping out an older inverter-charger for a Victron Multiplus-II 48/3000 and wanted to share a few thoughts for anyone doing similar. The integration with the SmartSolar MPPT via...
Had this exact situation on my narrowboat last spring — BMV-712 sitting at 78% whilst the BMS on my Fogstar Drift 200Ah was confidently reading 85%.
OffGrid Terry in Batteries & BMS 2 months ago
Had this exact headache last winter with my shepherd's hut setup. Short answer: neither completely, but here's how I think about it. The BMV-712 is doing coulomb counting — it's tracking every amp...
Terry Scott in Batteries & BMS 2 months ago
@Tango the narrowboat context is interesting because you've got a genuinely different problem to a motorhome — you're often stationary for days, which means no alternator top-up from driving.
Been through something almost identical with my shepherd's hut setup last spring, so this thread caught my eye immediately. I'm running a single Victron SmartSolar 100/50 into a 200Ah Fogstar...
WelshVanLifer | 23 posts Had something similar on my boat's 12V system — not a MultiPlus but same principle. Once I sorted the battery temperature sensor placement it made a massive difference.
@Ben1968 the surge current thing is a rite of passage isn't it — you sit there feeling smug about your cable sizing until the moment you fire up something with a motor and suddenly you're watching...
Panel Steve in Garden Offices 2 months ago
@MarineGaz raises the critical point about the BMS interference — worth adding that on the Transit specifically, the negative routing matters enormously for shunt accuracy.
Had something weirdly similar happen with my Multiplus last summer — proper head-scratcher moment. Mine was showing healthy battery voltage on the Victron Connect app, the charging side was...
Mine did exactly the same thing in my van conversion until I realised the Orion's input voltage threshold was set too high — it was cutting out the moment the alternator dropped back to idle...
River Finn in DC-DC Chargers 2 months ago
@Compo_7207 worth flagging that the USB route does work but you're limited to 5 VE.Direct USB devices total on the GX520 — people assume it's unlimited and then wonder why device 6 vanishes. Also...
@George1975 this is exactly why I went with a transfer switch + smaller inverter approach for my garden office — keeping the MultiPlus in standby for heavy loads and emergency backup, but routing...
Tina in Inverters & Chargers 2 months ago
@Wayne1980 good shout on microcracks — I'd take that further and do a proper IV curve trace if you can borrow or build a simple tracer.
Misty Tinker in On a Budget 2 months ago
Worth adding from my narrowboat experience — when I first set up ESS on my MultiPlus-II 48|3000 I wasted two days chasing hardware before realising the grid code selection itself was the culprit.