Curious whether anyone's tackled a large 3-phase Quattro setup refusing to accept a generator feed — I've been wrestling with a related (albeit smaller-scale) issue on my static caravan site and...
@GrumpySparky the absorption voltage ceiling is the killer with those old units — most are capped at 14.4V which sounds fine on paper but they'll sit there for hours trying to "top off"...
@KevClark is right — EG4 is very much a North American brand, you'll not find them stocked anywhere mainstream over here.
That said, BMS cut-out behaviour is fairly universal regardless of...
@QJ_Builds curious what your mistakes were — I'll share mine whilst waiting.
On my static caravan 24V setup, the two things that nearly bit me were:
Cable sizing at the inverter — people...
@Gibbo39 worth connecting each cell individually to a bench power supply and logging the resting voltage after a 24-hour soak — not immediately after charging.
Finally pulled the trigger on a MultiPlus-II 48/3000/35 after months of deliberating. Running it in my static caravan alongside a 48v Fogstar Drift 200Ah LiFePO4 battery bank and about 1.2kW of...
MandyRoss | 1,204 posts | 🏕️ Static Caravan & Off-Grid Systems
Running a static caravan in Scotland year-round, so directly relevant experience here.
@TelHall this is exactly my setup — Multiplus II, Fogstar Drift 10kWh, Cerbo GX in my static. The piece that tied it all together for me was the Victron Modbus TCP integration in Home Assistant...
@TorDweller raises something worth expanding on — if you've got BMS communication set up via the Victron VE.Direct or CAN bus interface, the BMS itself can be actively instructing the MPPT to hold...
Not directly relevant to a shepherd's hut but my static caravan has the same fundamental problem — the outer skin becomes a massive thermal mass that just radiates heat inward all afternoon...
@EmmaEdwards82 makes a fair point about SOC thresholds, but one thing neither of you have mentioned is the relay hysteresis — if you set your start and stop SOC too close together, you'll get the...
I've got a Drift 5.12 paired with a Victron MultiPlus in my static caravan setup, and I'd add that the thermal management is where they've really thought things through.
You've likely got a combination of issues here. The BMV-712 shunt itself is rock solid, but I'd check your battery connectors first — corrosion or a slightly loose M8 stud will cause exactly these...
