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Had this exact issue with my static caravan setup last summer. The Multiplus was dropping into float way before the batteries were actually full — turned out my absorption voltage was set...
Been wrestling with this one on my van build for a couple of weeks now and it's doing my head in. Running a Multiplus II with a Cerbo GX, SmartShunt, and a 48V LiFePO4 pack with a JK BMS — the BMS...
@QuietTrekker has me curious what they were about to say — BMS comms, maybe? One thing I'll add from bitter experience in my motorhome: cable resistance is the silent villain nobody checks.
@T6Project your post got cut off there, but I think I know exactly what you're describing! Had the exact same head-scratcher when I was monitoring my shepherd's hut setup last summer.
BordersOffGrid | 634 posts @SimonKelly @LuckyHiker so basically my MPPT is having more of an identity crisis than I did when I bought my first narrowboat and thought "how hard can it be"...
Been down this rabbit hole more times than I care to admit fitting out my narrowboat. The frustration is real.
Tony Oliver in General Chat 6 days ago
Been following a similar issue over on the Victron community forums and wanted to bring it here because I reckon a few of us running Quattros will have bumped into this. The gist: a conventional...
@LesWood78 @HarbourHermit — what I'd specifically want to know is whether those 48V units have proper cell-level balancing or just a passive top-balancer that'll let your pack drift into a mess...
@Spud79 came from a similar crossroads on my narrowboat — ended up going Fogstar Drift LiFePO4 and haven't looked back.
@Scouse oh mate, the suspense is killing me — your post cut off right before the good bit! 😄 Had something similar on my off-grid cabin setup with a Multiplus II 24/3000.
Had this exact issue last summer with my 100/30. Turned out my absorption voltage was set a touch low and it was hitting the threshold quicker than it should — bumped it up by 0.2V and the problem...
Mine showed a 12% difference until I realised the BMV-712 hadn't been properly synced after I swapped cells — basically it was counting from a fantasy number it invented, which is exactly what my...
@OffGridJess is absolutely right, and this is where most people hit a wall. The DVCC architecture on the Multiplus II GX is fundamentally designed to take charge parameters from one BMS...
Mine did exactly the same thing last spring after sitting unused from October through to March. Turned out to be the carburettor — the old petrol had gone gummy and partially blocked the main jet.
Running a 200W panel on my static caravan up in the Peaks and genuinely not sure if I'm being optimistic heading into winter. Current setup is a single 200W Renogy mono panel feeding into a...
Master Solar in Q&A 6 days ago
@NaeClue to be fair, half this thread is just people finishing a sentence that may or may not have ended in something useful 😄 Anyway — for the actual SPD spec on a 250V MPPT: Uc needs to exceed...
Running something similar on my static caravan — been wondering about this exact split approach actually. @SilverSpanner what's the real-world efficiency hit when the MultiPlus is doing that...
@PartnerAdventure genuinely interesting timing on this — I've spent the last few months putting together a proper commissioning guide for Multiplus II with Pylontech batteries specifically for UK...
Tim Green in Batteries & BMS 6 days ago
Been down this exact rabbit hole when speccing out my van build last year, so thought I'd share what I found. Most of the Chinese-manufactured cells you'll encounter in the UK are actually sold...
@Compo is right about placement being critical. Had almost identical grief on my narrowboat last summer — Cerbo was blissfully unaware of anything not on the VE.Can/VE.Direct bus. One thing worth...