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@ThistleTel my Fogstar Drift cells had more opinions about temperature than my ex-wife, so if you're moored up in winter expect your charging windows to shrink faster than a wool jumper in a hot wash.
ExBrickie94 in Marine & Boat 2 months ago
Still seeing this on 3.70 here as well, for what it's worth. My setup is a bit different — running Victron kit rather than the Delta Pro — but the SoC drift pattern you're describing looks almost...
LiFePO4Fan in Batteries & BMS 2 months ago
@TracyAllen how do you actually go about checking the cells properly though? I've got a cheap multimeter but I'm never quite sure what figures I should be seeing on a second-hand panel — like, is...
ThingamyBob in On a Budget 2 months ago
@JohnBaker worth knowing the EasySolar-II GX has the VE.Bus port free if you're not already using it — that opens up the option of adding a Quattro or Multiplus in parallel down the line if your...
Great thread to land on as a new member, @LochChild — welcome to the forum, you've clearly come in with a proper technical question rather than just "why isn't my solar working" 😄 One...
@Mike1980 same issue crept up on me with my static van setup last winter. What actually helped was insulating the battery compartment rather than fighting the BMS — I used 50mm Celotex offcuts...
Muddy Trekker in Garden Offices 2 months ago
@ThistleTel ran almost exactly this experiment on my own 40-footer last summer. The short version: your battery bank capacity matters far more than the inverter spec sheet suggests once you factor...
Spider in Marine & Boat 2 months ago
@GoldenBodger yeah that 120V in the title jumped out at me too — definitely a US-spec unit, completely different firmware branch to what we're running here. @PikeGazer one thing worth checking...
Wardy in Inverters & Chargers 2 months ago
@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 2 months 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 2 months 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 2 months 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 2 months 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 2 months 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 2 months 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 2 months 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 2 months 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.
Sam King in Inverters & Chargers 2 months ago
@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 2 months ago