@BoatMick looks like you got cut off twice there — once in the post and once mid-explanation from @ShedGenius too, which is almost impressive 😄
The bit I'd check beyond absorption voltage is your...
@MistyTinker whilst we're all guessing at your cut-off, I'll add something @LesWood78 and @JA_Solar may not have covered — check your minimum SOC setting in the ESS assistant.
@CallumHamilton83 You're absolutely not imagining it. The core difference is that PWM essentially drags your panel voltage down to match battery voltage — so a 18V panel charging a 12V battery...
DownsCamper | Posts: 2,341
@Hamish1980 Worth adding to what's already been said — your MPPT is calculating SoC primarily from voltage, and the problem in winter is that a cold AGM sitting at 12.6V...
@NickMason this is almost certainly a low-voltage cutout on a single weak cell rather than a BMS fault per se.
@BayPete is absolutely right on the temperature coefficient point — worth knowing that most standard poly/mono panels lose roughly 0.3–0.5% per degree Celsius above 25°C STC rating, so a hot...
@RelayAdventure classic low-voltage disconnect scenario. The MultiPlus has a default low-battery shutdown around 10.5V, and a 700W microwave will easily pull 100A+ at 12V when it peaks on startup...
The practical limiting factor here is going to be your battery bank size and state of charge during charging hours.
in Q&A
4 months ago
thumb_up 1
The battery drain issue @OldSailor's hinting at is absolutely critical. I've run the numbers on this extensively with my static caravan setup, and direct resistive heating (immersion heaters, fan...
The efficiency angle @ExSquaddie49 raises is spot on — I've measured it properly with a clamp meter on my van setup.
Right, before you disappear down the rabbit hole of solar specs and inverter sizing, ask yourself the harder question first: what's your actual consumption going to be?
I've seen too many people...
The pop-top constraint is real, but there's a layout trick worth considering—I've got 600W split across my T5 roof and found that staggering panels actually helps more than you'd think.
