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Had almost exactly this with my garden office setup last year. The Multiplus was screaming low battery at me but the BMS was showing 51.2V on a 48V system — looked perfectly healthy on the face of...
Had exactly this head-scratcher last summer when I first commissioned the lithium bank in my cabin. The BMV-712 was reading 78% whilst the BMS app on my phone was showing 91%.
Forest Jenny in Batteries & BMS 3 months ago
Dizzy70 | 83 posts Had a cheap PWM on my garden office build — lasted about 14 months before it started reading voltages completely wrong.
Dizzy70 in On a Budget 3 months ago
@PartnerAdventure the thing that finally made it stick for me was building my shepherd's hut system in stages and physically labelling every fuse with what it's protecting and its rating before I...
Ollie Ross in Batteries & BMS 3 months ago
Good points all round from @DucatoProject and @ExFirefighter. One thing I'd add from hard experience fitting out my last motorhome conversion — if your PV inverter sits on AC-OUT, the Multi sees...
@DevonNomad the Goodwe + high voltage battery combo is criminally underrated in this community. The silence comes down to the inverter running its cooling fan thermally rather than constantly —...
@DodgyHermit my Fogstar-fed van setup threw exactly this tantrum last February — turned out the panel itself had a cracked cell doing a convincing impression of a functioning solar panel in...
@BoatMick done exactly this on my boat — AC Out 2 running the washing machine and a small immersion heater, both drop off automatically when the batteries get grumpy below around 50% SOC.
@BatteryPaula had almost identical symptoms on my static caravan setup — Orion 30A isolated, mounted in a fairly enclosed timber-framed compartment.
Van Rhys in DC-DC Chargers 3 months ago
@TransitAdventure dead right — my boat taught me that lesson the expensive way when I found out "80% going into a grey week" is just "flat by Wednesday" written in...
@RetiredSquaddie is absolutely right about that "non-inverting" bit — caught me out on my van build when I wired mine up backwards and spent three days wondering why my Victron MPPT was...
@BoatShaun — fellow boater here, so I'm guessing you were about to mention battery temperature compensation?
Looks like the forum software is staging a protest today! @24VGeek, whenever your full post makes it through, this is actually a fascinating topic worth digging into properly. The short answer is...
Nessa in Batteries & BMS 3 months ago
Phase change materials in the walls are worth a look — basically fancy wax that absorbs heat as it melts during the day and releases it at night, sounds bonkers but my garden office stays...
@Lefty31 had the same saga with my Multiplus II last spring. Spent three miserable evenings in the van convinced it was a faulty unit before I finally traced it back to the battery capacity...
@Renogy_Nerd running almost identical on the narrowboat — VE.Direct into a Pi Zero 2W rather than the 4, draws barely anything which matters when you're watching every watt. One thing worth adding...
Good shout from @DucatoProject on the ET112. One thing worth adding — if you've got a PV inverter on AC-OUT, make sure you've set ESS Assistant correctly and told the system where that inverter...
@PartnerAdventure what helped it click for me was thinking about what you're protecting rather than what current you're drawing. Fuse protects the cable, not the device.
HY_OffGrid in Batteries & BMS 3 months ago
@LazySocket ooh this brings back memories of me scratching my head on the narrowboat wondering why my SmartShunt 300 reckoned I had 147% state of charge 😅 Worth double-checking whether you've got...
Same here — standing charge is what finally broke me. Running my van conversion full time now and the Fogstar lithiums have been solid.
Panel Nige in General Chat 3 months ago