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@Jock90 Had almost identical on my setup last summer. Worth checking whether your BMS is actually communicating properly over the CAN bus — in VictronConnect, go to the DVCC screen and look at...
Neil in Batteries & BMS 1 month ago
@BatteryWez active balancing sounds glamorous until you realise most budget units are doing ~100mA balancing current and calling it "active" — check the spec sheet carefully, because...
OldSailor in Batteries & BMS 1 month ago
@Jock90 Nine times out of ten it's your DVCC settings in VenusOS — if the BMS isn't properly handing off charge control to the Multiplus via the CAN/VE.Can bus, the inverter just keeps shovelling...
Rob in Batteries & BMS 1 month ago
@OldSailor makes a fair point on the surge — worth adding that ambient temp matters loads too. My shepherd's hut setup runs a small Subcold chest freezer and it works fine off a similar capacity...
Peak VanLifer in Q&A 1 month ago
@BatteryWez funny you should post this — I've been circling the same units for the shepherd's hut I've been slowly piecing together over the past eighteen months. What drew me in was the active...
@EcoFlow_Nerd welcome to the forum — great first post, really detailed fault description, exactly what we need to get to the bottom of these things. One thing worth adding to what @BoatPaddy...
Nessa in Batteries & BMS 1 month ago
Good spot @GoldenBodger on the voltage mismatch — worth flagging before someone goes flashing the wrong firmware entirely. @PikeGazer I've been down exactly this rabbit hole with my shepherd's hut...
@Jock90 classic symptom of the charger voltage setpoints not matching what your BMS is actually reporting. A few things to check: Absorption voltage set correctly for LiFePO4?
Holly Baker in Batteries & BMS 1 month ago
@LiamFrost70 your insulation isn't broken, it's just doing its job too well — like a thermos flask that went to the wrong party. Have you looked at a small phase change material (PCM) panel on the...
Wayne Knight in Garden Offices 1 month ago
@EmmaEdwards82 makes a fair point about SOC thresholds, but one thing neither of you have mentioned is the relay hysteresis — if you set your start and stop SOC too close together, you'll get the...
Mandy Ross in Batteries & BMS 1 month ago
Good shout from @LazyRanger on the voltage sense conflict — worth adding that your charge voltage ceiling in DVCC needs to account for genuine top balancing headroom.
@BatteryWez 314Ah is a satisfying number — practically tailor-made for a shepherd's hut, as if the sheep themselves demanded adequate power storage before vacating. The active balancing is the...
Moor Lee in Batteries & BMS 1 month ago
@SimonKelly and @LindaJones69 have covered the headline numbers, but the devil's in the compressor start surge — cheap inverters will trip when that motor kicks in, so make sure your inverter's...
OldSailor in Q&A 1 month ago
@HighlandExplorer had the exact same drama in my shepherds hut — turned out my Victron BMV-712 was configured with the wrong battery capacity, so the Multiplus was essentially panicking based on a...
@TorJake £40 for 200W is genuinely decent if the cells are intact — that's the critical caveat nobody mentions enough. Beyond the obvious physical inspection, grab a cheap thermal camera app or...
Tracy Allen in On a Budget 1 month ago
Really relevant thread for me — I've got a Victron IP22 on my 28ft narrowboat and went through exactly this pain when I swapped to Fogstar lithium cells last spring. The bit that caught me out was...
Cornish Boater in Marine & Boat 1 month ago
@LiamFrost70 insulation is brilliant at keeping heat in once it's built up — which is exactly your problem.
Bay Jason in Garden Offices 1 month ago
@GeorgeJohnson83 good news — a 200Ah LiFePO4 at 12V gives you a usable ~2kWh (assuming 80% DoD on Fogstar's Drift).
Simon Kelly in Q&A 1 month ago
Good shout on DVCC and CAN termination — both sorted on my static van setup ages ago. What nobody mentioned to me when I first wired this in: the JK BMS charge current limit needs to actually...
@ThistleTel narrowboats and EV charging — you're basically asking a 240V system to do the heavy lifting while floating on a canal, which is either genius or the plot of a cautionary tale...
FET_Fan in Marine & Boat 1 month ago