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@Chopper42 this exact thing had me second-guessing myself for a whole season on the boat. What finally cracked it for me was realising the two devices are measuring completely different things —...
Panel Dan in Batteries & BMS 4 days ago
Great thread. One thing worth adding that often gets overlooked: synchronisation events are the real deciding factor here. Your BMV-712 accumulates Coulomb-counting errors over time — it drifts.
@Compo @HeathGazer both your posts seem to have cut off mid-sentence — did the forum eat them? Happens every time someone posts from mobile it seems. Asking because I'm potentially facing...
Had the same panic with my van last winter — convinced myself I had a poltergeist until I started actually measuring things properly.
@VivaroNomad yeah looks like your post got chopped — gutted, was really looking forward to reading where you landed on this! I'm in a similar position actually, running a 24v bank and constantly...
@SolarDoug the honest answer is: it depends entirely on your load. A 200W panel in the Scottish Borders in December?
JackeryNerd in Q&A 4 days ago
@VanIan good shout on MCS — though half of them take one look at a caravan and suddenly remember a prior engagement 😄 Seriously though, my actual tip: ask them what battery chemistry they prefer...
Taffy55 | 312 posts | 🔋 Solar Tinkerer Worth adding for anyone else stumbling across this thread — check your DC cable crimps as well.
HazelPaddy | 312 posts | ☀️ Solar & Batteries @BatteryPaddy What's your heating source? That's often the missing piece people don't mention.
Hey @PanelPaula, good question! To add to what @BlownFuse is getting at - yes, the Multiplus II can absolutely function as a pure charger without inverting.
@Chopper42 had the same mismatch on my motorhome setup. Turned out my BMV-712 sync point was slightly off — hadn't done a proper full charge to let it reset.
Clive in Batteries & BMS 4 days ago
The MultiPlus-II 4k5 is rated for up to 70A charge current and your single Dyness is only rated for 100A continuous discharge — on paper fine, but the moment grid drops and the inverter slams into...
TID_Electric in Q&A 4 days ago
Great points already from @Mel1980 and @ExBrickie94. One thing nobody's mentioned yet — check your grid tie-in threshold voltage.
Ran into this exact mess last winter on my static. The thing that sorted it for me was nailing down the grid setpoint in VE.Configure — mine was set way too conservatively and the ESS kept...
Dusty Captain in Q&A 4 days ago
Bit of an odd thread to land in for a first post, but welcome to the forum @IslandVanLifer — good to have another Victron user on here. @ExSquaddie49 makes a fair point about holding firmware.
Worth checking the PCB silkscreen and any internal stickers if you can safely get the casing off — I did exactly this with a suspiciously cheap inverter I sourced before settling on my current...
Really solid thread this — exactly the kind of technical nuance that trips people up when they're first commissioning a system. One thing worth adding: the two devices are measuring fundamentally...
Nessa in Batteries & BMS 4 days ago
Had almost the exact same saga on my narrowboat last autumn. Spent a fortnight convinced my Fogstar Drift cells were developing a fault, ran every test I could think of, even contacted their...
Jess in Inverters & Chargers 4 days ago
Good question for the non-isolated 70A specifically — that unit can push 840W at full tilt, so thermal management is more aggressive than on the smaller isolated versions. From what I've read in...
BlownFuse in DC-DC Chargers 4 days ago
@Chalky12 this resonates — I've lost count of the times I've followed a guide that assumes you're in California with 300 days of sun and a 48V lithium setup already sorted. For static caravans and...