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Been following this thread with interest as I've got a similar setup running here. MP2 8kW paired with Dyness boxes, though mine's a single 10kWh unit at the moment. The inrush current issue...
Spot on about winter being brutal. I learned that the hard way first year — thought 10kWh would see me through, ended up rationing heating come January.
Chippy in Batteries & BMS 1 month ago
I've been pondering this myself for a similar setup in my van conversion, so keen to hear what others think. Really depends on your actual power requirements, doesn't it?
Ah, the classic cold-weather gremlins! @DodgyMechanic's spot on about the display unit being the culprit.
Right, I've been down this road myself with my shepherd's hut setup, and wiring diagrams can be a proper headache if you're not careful.
Not had this specific issue meself, but I've read enough threads over the years to know Victron gear is pretty robust in cold conditions.
Good analogies from @RetiredElectrician and @TracyKnight. The bit that sold me on understanding mine was realising the BMS actively balances your cells during charging — keeps them all at similar...
DODQueen in Batteries & BMS 1 month ago
I've been mulling this over for months now. Got a 57ft narrowboat and seriously considering panels, but the logistics are mental. The main issue is roof space—it's genuinely limited, and you're...
Louise in Marine & Boat 1 month ago
Spot on about the "too many cooks" issue. The Multiplus II can indeed ignore BMS CCL when it's not the primary charger — it's a known quirk with Victron's implementation. What's your...
Yeah, had this nightmare on my narrowboat last winter. Victron MultiPlus kept dropping out below about 5°C, which was brilliant timing given I was moored up north. Turns out it wasn't actually the...
Ah, the classic "too many cooks" scenario with your chargers. Multiplus II can be a bit stubborn about respecting external BMS limits when it's not the only voice in the room —...
Been scratching my head over this one myself. Got a similar setup — Multiplus II handling the solar side, but I've also got a petrol gen that can push charge when needed.
Had exactly this with my BMV-712 last winter. The shunt itself is fine, but the display unit's got temperature compensation built in — sounds like yours might need recalibrating or the shunt's...
Ran a 200Ah Victron LiFePO4 in my shepherd's hut for two winters now. Winter's where they really shine — the usable capacity beats lead-acid hands down.
Polarity disasters are no joke. Install an Anderson connector with a keyed design—physically impossible to reverse.
Yeah, mine's been a right pain in the arse lately. Victron BMV-712 here, and when temps drop below about 5°C the voltage readings start drifting — nothing dramatic, but enough to mess with your...
Got a 5.12 tucked under my shepherds hut and it's barely broken a sweat even when I'm hammering it with a 4kW load in summer—honestly think the price-per-reliability ratio beats anything else I've...
Camper Carl in Product Recommendations 1 month ago thumb_up 1
The thermal story's interesting—mine sits in the narrowboat cabin where ambient swings wildly, and it just doesn't stress.
HalfAJob in Product Recommendations 1 month ago thumb_up 3
Running a 5.12 paired with a Victron Multiplus in my setup, and the thermal performance is genuinely impressive—stays well within spec even during peak summer charging.
Mark in Product Recommendations 1 month ago thumb_up 1
The real question is whether your battery can keep up with the solar, not the other way round. I'm sat here with a 10kWh LiFePO₄ watching my MultiPlus throttle everything—solar production peaks...
Brian Brown in Q&A 1 month ago thumb_up 2