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@Chalky12 correct on the JK front — it's probably the best-supported BMS for Solar Assistant Bluetooth integration right now. Worth clarifying though: Solar Assistant typically requires a...
@LutonNomad this is the bit everyone glosses over. Fogstar Drift's BMS has a combined charge current limit — I think 50A on the 100Ah — so if your IP22 is pushing 30A, Orion another 15A, and MPPT...
SolarJunkie in DC-DC Chargers 2 weeks ago
@OldSailor78 pretty much nailed it. 3 phase for a shed office is madness unless you're hiding a CNC machine in there. Single phase with a decent Victron inverter and some solar panels will handle...
@Lefty28 interesting project. Worth clarifying for anyone reading — washing machine motors are almost universally induction motors, which means they can't self-generate without external...
@JX_Boats oh tell me about it 😅 did mine on the narrowboat last spring and the old unit had basically fused itself to the bulkhead with years of damp and painted-over screws.
Ivy Les in Marine & Boat 2 weeks ago
@MasterProject classic sign that your MPPT charge controller isn't actually talking to the Multiplus-II properly — check your VE.Bus or VE.Direct cabling because if they're not networked together,...
Good point from @ThistleTel on logging — if you've got the VictronConnect app paired you can pull the history and it'll tell you whether it's shutting down on high temp or low voltage.
Gill in DC-DC Chargers 2 weeks ago
@XHF_Builds the forum software is an absolute disaster lately. Anyway — actual question here: at what panel voltage does PWM genuinely become a problem versus MPPT?
Golden Mechanic in On a Budget 2 weeks ago
@JackShaw yeah that's the VE.Smart Networking doing its thing — one unit gets elected as the "master" and coordinates charge state across all three.
@JakeCrane Classic setup headache, this one! The short answer is they're measuring differently — your BMS is typically going off cell voltages and estimating SOC from that, whereas the BMV-712 is...
WhatsAFuse4 in Batteries & BMS 2 weeks ago
@CallumHobbs this is something I'd genuinely use too. My setup is land-based but I've got a Cerbo in the main cabin and a second one in the workshop/battery shed about 25m away — same problem, two...
@Gazza almost certainly a battery voltage sensing issue rather than the charger being faulty. The Multiplus is reading absorption as "done" because the tail current threshold is set for...
Right, so basically this is the thing I've needed since that Fogstar order where the cells arrived looking like they'd had a fight with a forklift and the "review" I left mysteriously...
@DuctTapeDave the drunk keyboard thing is a fair point but honestly half the Chinese cells powering decent batteries have equally unpronounceable brand names 😅 Thing I'd actually want to know...
Had this exact saga with my 100/30 last summer. Spent three weekends convinced the controller was faulty before I finally cracked it. Turned out my battery voltage sense was reading slightly high...
@Fiona1974 the Multiplus II will absolutely ignore your ESS "no grid charging" setting and top up the battery anyway if it decides the SOC has dipped below the sustain voltage threshold...
Battery Alan in Batteries & BMS 2 weeks ago
Great thread, this caught me out last year too! One thing nobody's mentioned yet — check your battery temperature compensation settings if you're running a BMV or Smart Shunt alongside the MPPT.
Interesting stuff, though I'd pump the brakes slightly on the "impressive" framing. The Germans are meticulous engineers, no question, but a lot of these Insellösung compound setups rely...
DODGuy in General Chat 2 weeks ago
From what I've seen with my own setup, Solar Assistant can pull data from certain BMS units via Bluetooth, but it's very much dependent on which BMS you're running.
Chalky12 in Batteries & BMS 2 weeks ago
Hey @RelayBuild, good shout on asking about battery capacity first — that's really the crux of it all. 800W of panels sounds decent on paper but it's meaningless without knowing what's storing it.
LOQ_Camper in Q&A 2 weeks ago