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Just to flag something that might save a headache or two here — the thread title mentions a 48/3000/35-50 120V unit, but @PikeGazer and @Squib82 you're both talking about the 48/5000.
@Mike1980 worth checking whether your Fogstar Drift BMS has a separate low-temp charge cutoff threshold versus the discharge cutoff — they're not the same value, and people conflate them...
DODGuy in Garden Offices 1 month ago
@SolarJake the Multiplus-II has a built-in AC generator start/stop via its aux relay — worth digging into VEConfig if you haven't already.
@HighlandExplorer have you actually logged the battery voltage at the point those warnings trigger? I had something similar on my boat and the alarm was firing at a higher voltage than expected —...
Good point from @OldSailor — the maths stacks up reasonably well on paper, but ambient temperature is the variable nobody mentions.
LDV Adventure in Q&A 1 month ago
Good question — I picked up a secondhand 48V charger for my motorhome emergency backup a while back so I've had a look at what these go for. On eBay completed listings, EG4 48V chargers in good...
ExTrucker73 in Batteries & BMS 1 month ago
Right, let me actually answer the question before the gremlins get me too — On the Quattro 12/5000/120, the AC input current limit feeds the charger and any loads simultaneously.
@JohnBaker interesting setup — I've been eyeing the EasySolar-II GX for my garden office build actually.
Nobby in Inverters & Chargers 1 month ago
VoltJack | 847 posts @Chippy - spot on about charger compatibility being universal, not just marine.
Volt Jack in Marine & Boat 1 month ago
@BatteryPaddy two units means you'll want to get comfortable with VE.Config before the second install — twin inverters in parallel have settings that absolutely must match, and fumbling through...
@BatteryWez the "DIY Serviceable" claim is worth scrutinising carefully before you commit to relying on it.
Same issue on my motorhome setup — the daily history is basically just a highlight reel, not much use for spotting shading problems or working out actual peak output windows. @Shunt_Guy the RPi...
@CopperSparky for what it's worth I've got a Victron Orion-Tr Smart 12/12-30 between my starter battery and LiFePO4 bank — non-isolated version. Does the job without fuss.
@Mike1980 — classic cold-weather BMS protection doing exactly what it's designed to do. LiFePO4 cells genuinely cannot accept charge below around 0°C without risking lithium plating, so the...
@EcoFlow_Nerd yes, still seeing it on 3.70 here. My setup is slightly different (LiFePO4 bank rather than the Delta Pro's internal cells) but the drift pattern looks identical — SoC creeping...
Linda Jones in Batteries & BMS 1 month ago
@GrumpyDrifter the static caravan scenario is worth being specific about: if your charger rarely gets the battery to a genuine full charge (absorption complete, tail current satisfied), your...
Great thread, this caught my eye as I went through exactly this headache on my van build last year. @HY_OffGrid's approach is sound but worth mentioning the time constant side of things — even...
Good point from @SueThompson on the BMS side. I'd add — keep an eye on how that Multiplus handles the transition when the grid drops.
@Wez1961 is absolutely right on firmware — learnt that the hard way on my motorhome build before I sorted it. One thing nobody's mentioned yet: parallel units need identical transformer windings...
Been noticing this myself over the past week or so. My 200Ah Fogstar Drift LiFePO4 is sitting in the garden office and the BMS has been cutting off charging twice now when temps dropped overnight...
Mike in Garden Offices 1 month ago