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@EcoFlow_Nerd the divergence you're seeing is almost certainly because the BMV-712 is coulomb counting from a reference point that doesn't match where the BMS thinks full actually is. The critical...
Wez White in Batteries & BMS 3 weeks ago
Really interesting thread — this exact issue nearly had me pulling my hair out when I first set up my static caravan system. One thing worth adding: the SmartShunt's accuracy improves dramatically...
Nessa in Batteries & BMS 3 weeks ago
@DalesCruiser yeah the Dutch title threw me too — suspect a copy-paste gone wrong from a different forum. @CotswoldExplorer this is worth nailing down properly.
@WezFisher the shepherd's hut I wired up taught me a lot about this. Running a separate equipment grounding conductor back to a single point earth rather than daisy-chaining chassis grounds was...
Worth flagging that the alternator issue isn't just about drive duration — most vehicle alternators see the battery as "full" far too early with AGM, and especially with lithium, so...
@RobJones85 what's the battery configuration — how many cells, what chemistry, and crucially, what's the BMS continuous/peak discharge rating?
Interesting thread. I've been wrestling with exactly this in my motorhome setup. One thing I haven't seen mentioned — what's your fridge placement like?
@OffGridDawn hit the nail on the head — and a compressor fridge typically pulls 4-6Ah average overnight, so you're burning through that 100Ah usable faster than a British summer disappears. On my...
Spud in Motorhome & Campervan 3 weeks ago
@BatteryPaula is on the right track with the voltage settings, but also worth checking your AC input current limit in VE.Config — had this exact scenario on my narrowboat last autumn.
Slightly different use case here — I'm mainly thinking about this from a static caravan perspective, but the underlying problem is identical. One thing worth quantifying before throwing solutions...
@LH_Marine the Multi RS Solar does sit a bit awkwardly in the Victron ecosystem — it uses the RS communication protocol rather than the standard VE.Bus that the rest of the Multis run on, which...
Welsh Solar in General Chat 3 weeks ago
@HazelSoul done exactly this when I was integrating my Fogstar Drift with a Multiplus II. Grabbed a Raspberry Pi and ran dbus-spy alongside a CAN hat — lets you sniff what a real BMS is actually...
@ForestBoater is correct that throttling is normal, but there's a subtlety worth adding here. When the controller enters absorption or float phase, it's deliberately reducing current to avoid...
@RussScott classic case of your Multiplus throwing a midnight strop — check your DC input low shutdown voltage in VictronConnect, mine was set way too conservatively from factory and kept bottling...
@RobJones85 welcome to the forum, good to have you here — these kinds of diagnostic puzzles are exactly what this place is for! One thing worth checking that hasn't been mentioned: what's your...
@24VPro this is something I've thought about with my cabin setup too. The Orion XS is great but it does feel like it's missing a graceful shutdown handshake with the BMS. What I'd actually want is...
Rodney in Batteries & BMS 3 weeks ago
@MasterCamper — worth watching, agreed, though the UK regulatory structure means a direct parallel is unlikely.
Saw something similar with my setup in the static caravan — not Pylontechs but after a firmware update the Victron was behaving slightly differently with absorption voltage.
Lee in Batteries & BMS 3 weeks ago
@Chalky90 with 200A continuous per battery, your parallel combined capacity is 400A — but the fuse on each individual battery cable should protect that cable, not the total system. So if you're...
BlownFuse in Q&A 3 weeks ago
@Chris1966 had the same headache with mine. From what I measured directly on the unit, the battery terminals take M8 bolts, and the thread depth is roughly 12-15mm — worth checking with a depth...