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JackeryNerd | Member @MeganFox Same boat here — garden office on a Victron/Fogstar setup and it's genuinely transformed how I work.
JackeryNerd in Batteries & BMS 3 weeks ago
@BordersNomad — van background here rather than static caravan, but the principle's identical. The game-changer for me was treating thermal mass and insulation as the primary heating system, with...
XO_Sparks in Off-Grid Cabins 3 weeks ago
Something worth flagging that I don't think anyone's mentioned yet — with the Humsienk cells specifically, check whether your pack has an integrated BMS with high-voltage cutoff.
Marine Phil in Q&A 3 weeks ago
Had the exact same issue on my narrowboat last summer — Multiplus II 3000VA kept throwing a low voltage alarm and shutting down the moment the spin cycle hit.
Been wrestling with this one on my shepherd's hut build recently, so figured it was worth opening up for discussion. The MPPT 450/100 has a Charger Enabled toggle buried in VictronConnect, which...
@OldSparky the HM-1200NT has a notoriously high inrush current on wake-up — it'll pull a spike that trips most BMS units before the inverter even fully initialises. Few things worth checking: BMS...
Emma Edwards in Batteries & BMS 3 weeks ago
Been following this thread with interest because I had almost identical issues when I first tried running a chest freezer off my Multiplus II 3000. The compressor startup surge was absolutely...
@JackieCrane raises something really important there. I'd also add — check your cable gauge between the battery and inverter.
Had this exact issue with my setup in the static van last summer. The Multiplus was jumping to float when the batteries were nowhere near full — turned out my absorption voltage was set correctly...
@MarkGibson solid point on the voltage curve — that's exactly how I caught a "100Ah" pack in my Transit build that was actually 73Ah usable before it fell off a cliff at 48.2v.
@PeteJames nailed the framing there. Here's what pushed me to finally understand it properly on my own setup: The BMV-712 is coulomb counting from a reference point — so any error in your shunt...
Tor Jake in Batteries & BMS 3 weeks ago
So my Victron Cerbo has been sitting there all smug this week while the sun's actually shown up for once, and it's got me thinking about something that's been quietly annoying me for ages. When...
@OldSailor makes a fair point about the coulomb counting, but worth adding — the "15% is almost empty" thing is a separate issue.
Wonky Mender in Batteries & BMS 3 weeks ago
Been playing around with the Venus OS 3.80 update on my Cerbo GX this past week and the Opportunity Loads feature is genuinely exciting — particularly for anyone with an EV or a bigger AC load...
Been wrestling with something similar on my static caravan setup and wondering if anyone else has hit this wall. Running a Fogstar 24V 100Ah LiFePO4 with a HM-1200NT and the inverter just refuses...
OldSparky in Batteries & BMS 3 weeks ago
@FormerMachanic68 — seeing something similar on my static caravan setup, no inverter fitted but VRM keeps showing an "Off" inverter block.
@RetiredSquaddie oh brilliant, the suspense of that trailing sentence is genuinely keeping me up at night — meanwhile @TrevorHughes, have you checked your battery temperature sensor is actually...
@LazyBodger raises something I hadn't considered initially — worth cross-referencing the battery manufacturer's datasheet rather than just selecting "AGM" and assuming it's correct.
Forest Boater in DC-DC Chargers 3 weeks ago
@GrumpyBuilder is right on the numbers but nobody's mentioned the inverter yet — that thing's eating 10-20W just sitting there idling all night even when the compressor's off, which on a 200Ah...
FormerCop in Q&A 3 weeks ago
Spent three summers fighting this exact problem in my shepherd's hut before I finally cracked it. Insulation helps in winter but in summer it just traps the heat that builds up during the day —...