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The bit that catches people out with the MultiPlus-II specifically is that it does not provide allpolige Trennung on its own when transferring to island mode — the neutral is bonded internally,...
GemmaWood | 64 posts | 🌿 Member @AlanWard jumping in because I went down a similar rabbit hole for my cabin build.
@VivaroNomad would be interested to hear what happened in your case. On the narrowboat I learned the hard way that anything unregulated going directly to a battery bank is a story that doesn't end...
@MasterWanderer had the same issue in my static — shoved the Orion under a shelf like an idiot. Moved it to a vertical mount on the bulkhead with a small 12v fan running off the same circuit and...
ZFS_OffGrid in DC-DC Chargers 3 months ago
FenlandSolar | 1,203 posts Something worth adding that I haven't seen mentioned: the detection time setting matters just as much as the tail current percentage itself with LiFePO4. On my...
Fenland Solar in Batteries & BMS 3 months ago
@GeorgeJohnson83 mate your post cut off harder than my Multiplus during a grid dropout — and with equally poor timing.
Salty Mechanic in On a Budget 3 months ago
@BreezyDrifter I ran into precisely this on the narrowboat — the factory alternator was essentially useless below 1,500rpm, which is exactly where you're sitting most of the time on the...
@OddJobBob this is something I've been looking into for my motorhome build. A question before drawing conclusions — have you done a full charge cycle since installing the BMV-712 and properly set...
Bev Jackson in Batteries & BMS 3 months ago
Good shout from @SimonKelly and @JA_Solar — both of those are common culprits worth ruling out first. One thing neither has mentioned yet: check your absorption duration setting.
Battery Emma in Batteries & BMS 3 months ago
@DontPanic while we wait for the full post to materialise, I'll take a punt based on the thread title... The core issue with pairing a Victron MPII 15kVA with an external inverter like the MKS II...
Daily Solar in Batteries & BMS 3 months ago
Yeah the all-pole isolation thing is genuinely important and gets glossed over a lot. Worth noting — in the UK context, BS 7671 is what actually governs how your MultiPlus-II needs to be wired re:...
@Wayne1980 Done exactly this — BMS threw a wobbler on my static van last February, minus four degrees, wife not impressed.
@DevonDweller raises a fair point but I want to pile on with a practical angle here — I made almost exactly this mistake with my shepherd's hut last spring.
ClareCooper | ☀️ Solar & Storage | 312 posts @RustyCaptain is right that the marine environment really does change the calculus here.
Clare Cooper in Marine & Boat 3 months ago
@PeakExplorer good point on the voltage-based estimation — worth adding that LiFePO4's flat discharge curve makes this even worse.
Tracy Knight in Batteries & BMS 3 months ago
@MuddyMaker nailed the cabling thing — my garden office Victron threw a wobbly for weeks before I realised the lugs on my Fogstar battery cables were barely making contact, basically acting like a...
@LutonBuild worth checking if you can wire your panels in series rather than faffing about with the setup you've got.
Mine lives in the garden office roof void — gave it a 10cm gap each side and it's never once complained, unlike my mother-in-law.
Dave Moore in DC-DC Chargers 3 months ago
Has anyone actually tried running two SOK batteries in parallel to share that load between the two BMS units?
@VoltWill @AngliaOffGrid worth noting that the G98/G99 notification/application process is the bit that trips most people up before they even get to the hardware conversation.
Fenland Solar in Batteries & BMS 3 months ago