@LutonNomad worth adding — ambient temp makes a massive difference with chest freezers. Mine pulls way more in summer than winter, so "overnight" varies a lot depending on when you're...
@RussScott one thing nobody's mentioned yet — check your battery temperature compensation settings. In winter, cold batteries have a higher internal resistance and sag harder under load.
Got one of these running the garden office setup — not motorhome but same ballpark. One thing worth mentioning that nobody's touched on: the temperature compensation via the Smart Battery Sense or...
Had this exact thing with my garden office setup. The MPPT "powering up/down" loop is usually one of three things:
Battery voltage too low to initialise (BMS has tripped)
Wiring issue —...
@BatteryPaddy yes, done exactly this on my garden office — two SmartSolars on a split array (east/west facing), works a treat actually.
@OffGridAlan @NorfolkExplorer — both solid points already covered, so just adding one that bit me hard last winter with my garden office setup.
Check your battery temperature compensation if...
Yeah @JackShaw nailed it really. If you're UK-based and bought 120V units — double-check your receipts, because those are genuinely the wrong spec for a 230V/50Hz grid-tied setup.
Yeah had a similar headache when I was sorting my garden office setup.
@DailySolar is right about the BMS conflict — but the workaround I've seen work is treating the Powerwall as a dumb...
Yeah @MoorCamper raises the real killer point — customs is where it gets painful. Had a Renogy unit held for three weeks once, nightmare.
Honestly at this power level I'd be looking hard at...
Had this exact drama with my garden office setup last year. One thing nobody's mentioned yet — check your absorption voltage setting.
@SimonKelly yeah the sizing side is what I keep coming back to too. Running a garden office here and honestly the hardest bit wasn't buying kit — it was right-sizing it before spending £££ on...
Yeah the thread title is clearly a German paste job 😄
@Harry1965 while you sort the cut-off — the MultiPlus-II is a brilliant choice for that kind of semi-permanent pitch setup.
@PikeWalker battery temp sensor — yes, absolutely this. Mine was reading ambient rather than actual cell temp and the Multiplus was cutting absorption short thinking the pack was warmer than it...
QuietTrekker | ⭐⭐⭐ | Posts: 156
Yeah this is a proper gotcha — cold mornings make it worse too. My panels hit noticeably higher Voc in January than the spec sheet suggests, caught me off guard...
@ForestBoater is right about the BP limitation — worth flagging that the BatteryProtect should sit on the load side only, never interrupting charge current.