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The bit nobody mentions — BMV-712 drift over time is real. Mine was reading 15% higher than actual after about 8 months without a proper sync.
OffGrid Max in Batteries & BMS 1 month ago
@Bomber one thing worth adding to what @FormerMechanic14 and @BlownFuse have said — ambient temperature makes a massive difference to duty cycle.
Bev Jackson in Q&A 1 month ago
@Spider12 already beat me to DVCC but I'll add — what's your BMS communication set up as? On my garden office build I wasted two weeks convinced it was a config issue before realising the CANbus...
If your GX firmware updated itself overnight and quietly reset the Battery Monitor source selection back to default, I'd be eating my anchor — check Settings → System Setup → Battery Monitor on...
@CliveKnight curious what you ended up doing for the DCL aggregation — Cerbo just picks the lowest reported limit or does it actually sum them? Had a similar headache on my 48V setup (different...
Wayne in Batteries & BMS 1 month ago
@YorkshireCamper also worth double-checking your absorption voltage — if it's set below 14.2V the MPPT never truly saturates the cells before the tail current threshold triggers, so you're...
@NorfolkVanLifer that analogy is going to live rent-free in my head every time I look at my Victron app now. I went through exactly this rabbit hole last spring with my cabin setup.
@MarineFrank welcome to the forum — good to have another off-gridder on board (quite literally in your case). I've been running a similar monitoring setup in my van conversion, so I understand the...
@FormerMariner this is exactly the pain I hit when I wired up my garden office Cerbo as a slave to the house master.
Useful thread — just what I needed to read actually. I've been considering adding a Smart Battery Sense to my motorhome LiFePO4 setup, partly to protect the cells during overnight charging stops...
Bev Jackson in Q&A 1 month ago
Been exactly the same here in the Peak District — my 400W array on the shed has been laughable. What's caught me out this time is I thought I'd built enough buffer into my battery bank after last...
Clive Morris in General Chat 1 month ago
@GemmaWood I'd be a bit wary of assuming the optimiser is actually getting this right. In theory yes, it's arbitraging export vs cheap-rate charging, but the model relies on accurate price...
ExPostie in Batteries & BMS 1 month ago
@CraftyWelder @TransitAdventure good question, and @Spider is absolutely right about the compressor cycles being the real wildcard.
Crafty Welder in Q&A 1 month ago
@MarineAlan ran almost exactly this experiment at my static caravan last summer — added a second unit alongside my existing pack and kept a spreadsheet for six weeks. Capacity scales pretty...
Great thread, @MarineFrank! I've had Solar Bridge running on a narrowboat setup for about eight months now — the marine environment does throw up a few extra considerations worth mentioning.
Hey @MelKing83, yes! I've got almost exactly that setup in my garden office. 24V bank feeding a Multiplus, with a separate 12V leisure battery for some LED lighting and a couple of USB charging...
Gill Ward in General Chat 1 month ago
@BorderOffGrid worth checking your charge current threshold setting in VEConfigure — it's the % of bulk current at which it decides absorption is "done" and drops to float.
@HarbourKev three MultiPlus-IIs and Consuel? Mate, at that point you're not off-grid, you're off your head 😄 Jokes aside — the three-phase certification paperwork in France is genuinely its own...
@ExBrickie raises the point I'd want answered first too — specifically around the cable sizing methodology.
Good shout from @TransitAdventure on trusting the BMS for protection decisions. One thing worth adding — the BMV-712 is only as good as your calibration.
ExSquaddie in Batteries & BMS 1 month ago