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Had the same headache on my static caravan setup. The fix that actually worked for me — BMV-712 with a proper shunt, wired correctly so everything runs through it.
@CrafterDream there's a chapter in this story that catches people out — the fuse rating relative to your battery bank's potential fault current, not just your expected charge current. I learned...
Had this exact headache with my shepherd's hut setup last winter — Fogstar Drift cells with a Seplos BMS reporting 10% SOC while the pack was sitting at 51.4V, which on a 48V LiFePO4 system is...
@FogstarFan the Victron MPPT will just laugh at your extra watts and throttle itself down like a bouncer turning away panels at the door — stay within the voltage limits and you're golden, the...
Cerbo_Master in Q&A 2 months ago
@FrostyHiker worth checking whether the Multiplus II is actually hitting its low voltage cutoff or overcurrent protection — they're quite different faults.
Interesting bit of kit but this feels very much like overkill territory for most folks on here — we're talking commercial/light industrial scale, not your average off-grid cabin or shepherd's hut...
Been down this rabbit hole myself when I kitted out my shepherd's hut a couple of years back, so thought I'd share some thoughts and get a discussion going. The Victron MultiPlus-II is the obvious...
ForestJenny | Posts: 2,156 Spent three seasons trying to make a cheap eBay unit work on my static before finally caving and getting a Victron SmartSolar.
Forest Jenny in On a Budget 2 months ago
Had almost exactly this on my shepherd's hut build last summer. Turned out my BMS was sending a false high-voltage signal to the Multiplus via the VE.Bus, which made it drop to passthrough...
Great thread — been running a similar Pi-based setup in my motorhome for just over a year now, and one thing I'd add that complements the InfluxDB logging nicely is setting up Grafana alerts to...
Went through this exact decision last year on my 57ft trad. Ran a standard 70A for years and it was perpetually losing the battle against a 400Ah LiFePO4 bank — engine would need to run for hours...
River Runner in Marine & Boat 2 months ago
@TransitCamper welcome to the forum, great to have another van person on here! 🚐 Looks like the post gremlins got ya — hoping you can edit and fill in the blanks, we're all curious what you're...
@BevJackson64 on my narrowboat I had mine set to 6A thinking I was being dead clever protecting the shoreline, meanwhile the Multiplus was having a complete existential crisis every time I boiled...
@FormerTeacher nails it — battery internal resistance is massive here. Even if your bank looks fine, if you're running older AGMs they'll sag hard under that initial surge and the Multiplus sees...
@BazBurns know this pain all too well! Did mine on a 57-plate Transit a couple of years back and the roof vents nearly had me beaten before I'd even started.
Something similar had me scratching my head for a couple of weeks last winter with my van-conversion setup — though obviously on a smaller scale than a three-phase Multiplus-II arrangement. I was...
Paddy Davies in Batteries & BMS 2 months ago
Odd one this — had something similar crop up on my static caravan setup last summer and it had me scratching my head for a good while. The 16.2V reading with zero amps/watts is almost certainly...
Had almost exactly this dilemma when I wired up my shepherd's hut last spring. Ended up going bigger than I thought I needed — a 100Ah Fogstar Drift LiFePO4 — and honestly it's been the right call...
Watt Barry in Garden Offices 2 months ago
Running a 100Ah Fogstar Drift LiFePO4 in my cabin setup and I've been eyeing up a pair of 200W panels going cheap on Facebook Marketplace — the maths technically works out at 400W total, but my...
FogstarFan in Q&A 2 months ago
Had this exact issue last winter with my Multiplus-II 48/3000. It kept jumping to float when the batteries were nowhere near full — SOC was still showing 75-80% in VRM but the charger was...
Mark in Inverters & Chargers 2 months ago