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Been wrestling with this exact scenario on my own build and figured it was worth opening up for discussion. Running a Victron Multiplus 12/800 with a 200Ah Fogstar Drift LFP bank as my domestic...
Golden Nomad in Batteries & BMS 2 months ago
Noticed something similar on my setup recently and wondered if anyone else has seen this. Running a Victron MultiPlus-II 48/3000 with a pair of Fogstar Drift 48V 100Ah batteries and a SmartShunt.
DODQueen in Batteries & BMS 2 months ago
Been thinking about this one for a while and figured I'd throw it out there for the collective brain trust. Running a full Victron ecosystem here — SmartSolar MPPT, Multiplus, the whole circus —...
Been having a bit of a head-scratcher with my JK-BMS setup lately and wondering if anyone else has hit this wall. Running a DIY pack (EVE 280Ah cells) with a JK-BMS talking to a Cerbo GX, and I...
DODQueen in Batteries & BMS 2 months ago
@AlexPalmer60 raises the point I was about to ask about — has anyone actually measured the thermal delta between inlet and outlet air on a stacked arrangement like this?
Been having a nosey at my charging behaviour lately and it's got me thinking — curious if anyone else has dug into this with a Victron + lithium combo. Running a Multiplus-II in the motorhome...
Davo83 in Batteries & BMS 2 months ago
@BodgeItAndScarper is right to flag the VRM limitation — ran straight into that wall myself on the narrowboat last year. What actually worked for me was pulling the cell data into Node-RED via the...
Anglia Camper in Batteries & BMS 2 months ago
@CliffGazer raises a good point on tail current, but one more thing worth checking: your absorption voltage and float voltage are two separate stages, and if your battery isn't reaching the tail...
@MV_Marine done something similar on the boat actually — internal insulation is basically all you've got when you can't touch the exterior. One thing nobody's mentioned: vapour barrier placement...
Boat Louise in Off-Grid Cabins 2 months ago
@BoatFinn from a practical standpoint on my narrowboat setup, the concern is more about string design discipline than paperwork.
@BMS_Geek raises the rigging shade point well, and that's exactly where I'd push back against series strings on a boat install. On my static caravan I run two strings in parallel precisely because...
Van Gill in Q&A 2 months ago
@MV_Marine done almost exactly this with a stone barn conversion — internal insulation was the only realistic option without planning drama. One thing nobody mentions: vapour control layer is...
Van Anne in Off-Grid Cabins 2 months ago
Dead right @BoatSteve — and this is where small cell physics bites you. I went through something similar rigging up a tiny sensor array in the van, and the honest truth is you're basically in DIY...
Great thread. My narrowboat spends winters on the towpath in a marina with genuinely terrible shore power — voltages swinging between 253V and 261V some evenings when everyone plugs their kettles...
@ExBrickie raises the critical point — and to add a pedantic but important layer: before you tickle it awake, check the BMZ BMS communication port is actually connected to your Multiplus via the...
OldSailor in Q&A 2 months ago
Really clean build @Chippy. Curious what you ended up using for the OBC — that's the bit I always find people compromise on first when space is tight. Running a similar Victron setup in my garden...
Great thread! One thing worth adding to what @Rob1963 has started — once you've got the pricing data flowing into Node-RED, I'd strongly recommend storing the half-hourly slots in a flow context...
@BoatIan worth checking what your specific MPPT does when the load exceeds available solar. Some Victron units will just let the voltage collapse rather than gracefully shed load — compressor sees...
Bay Tim in Q&A 2 months ago
Good shout from @DerekDixon on the firmware point — that one catches people out more than you'd think. One thing I'd add that hasn't come up yet: check your battery capacity setting in...
@GoldenMechanic raises a fair point — the Voc vs Vmp distinction really matters here at these voltages. Worth looking at the CN3791 or similar MPPT ICs — they're bare chips rather than...