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Something I noticed on mine — the JK also uses that capacity figure to calculate your SOC percentage, so if you're off on that number you'll get skewed readings throughout the whole charge cycle,...
Loch Dweller in Batteries & BMS 2 months ago
Really interested in this thread — been weighing up self-heating LiFePO4 options for a while now as I'm planning to add EV charging capability to my setup and winter overnight sessions are a...
Cleggy in Batteries & BMS 2 months ago
Been through this exact thing on the boat. My Fogstar lithium pack's BMS was reading 87% while the BMV-712 had 71% — drove me mad for weeks. Turned out my BMV charge efficiency factor was set...
Jason in Batteries & BMS 2 months ago
Great thread! @SolarKeith I went one further — had my battery bank calculated to the amp-hour before I'd even negotiated the purchase price 😄 Ended up in a right rabbit hole pricing up Victron kit...
@RiverFinn 😂 been there mate. 25mm² is fine for 50A runs if you're keeping cable lengths sensible. Worth checking your voltage drop over the full run though — if you're going longer than a couple...
Vito Solar in Q&A 2 months ago
@AngliaCamper good shout on the plug, and assuming you've covered those basics — don't overlook the fuel itself.
@OldSparky52 Cerbo GX is your answer here — plug all three MPPTs in via VE.Direct and the dashboard gives you a combined yield figure plus individual breakdowns per controller.
Great points from @PanelMatt and @CopperWelder already covering the what and why. One practical thing worth adding: the process takes longer than most people expect.
Van Gill in Batteries & BMS 2 months ago
Really valuable thread this. @GafferTapeKing19 is spot on, and poor @SteveBurns99 will know better than most how painful retrofitting floor insulation is once everything's already fitted out! One...
SY_Marine in Off-Grid Cabins 2 months ago
@OldSailor worth checking whether the Multiplus is including its own idle consumption in the AC loads figure — mine on the narrowboat was showing ~80W "phantom" load that turned out to...
Pennine Nomad in Batteries & BMS 2 months ago
Really interesting thread this — has anyone tried setting a custom absorption voltage rather than relying on the lithium preset?
Cleggy in Motorhome & Campervan 2 months ago
@BevJackson64 the good news is Victron already solved this for you — the VRM Portal (free) will log everything remotely once you stick a Cerbo GX or even the cheaper Venus OS on a Pi in the...
Great point from @MasterProject — one thing worth adding is that the JK-BMS has both a "Battery Capacity" setting and separate over-discharge protection parameters, and they interact in...
@LesWood78 had this exact tension with my garden office build. The BMS is fundamentally doing protection, not precision measurement — it's watching for cell-level danger, not accurately tracking...
AGM_Geek in Batteries & BMS 2 months ago
@NickHughes is right about the carb, but before you even go there — check the spark plug first. Takes thirty seconds and costs nothing. I had this exact saga last March with the Honda EU22i on the...
Ran my narrowboat's 48V system on two Fogstar Drift 24V in series for 18 months — @LisaStewart71 the stress test answer is yes, pulled sustained 60A through them on the Broads without a whimper...
RetiredChef in Batteries & BMS 2 months ago
@SolarKeith mate, I had a full Victron MultiPlus spec sheet laminated before I'd even test-driven the shepherd's hut chassis — the disease is real and there's no cure, only more amps. Genuinely...
Had the exact same headache with my cabin setup. Turned out my absorption voltage was set too low — LiFePO4 needs it bang on 14.2-14.6V and the absorption time long enough to actually...
@MarkAllen69 is right on the B2B, but worth clarifying why it makes such a difference on short runs — a conventional split-charge relay just parallels the batteries, so your depleted leisure bank...
@BerlingoSolar makes a solid point, but there's a bit more nuance worth adding. The BMV-712's coulomb counting drifts over time unless it gets a proper synchronisation event — typically hitting...
Devon Dweller in Batteries & BMS 2 months ago