Had this exact issue with my static caravan setup last summer. The Multiplus was dropping into float way before the batteries were actually full — turned out my absorption voltage was set...
Been going back and forth on this one for my shepherd's hut build and thought I'd throw it open for discussion.
Looking at the MultiPlus 48/5000 versus the MultiPlus-II — the AC Out 2...
@BordersNomad which firmware version is on the JK? I had a similar setup in my static van and early firmware on the B2A8S20P had a habit of dropping the RS485 connection intermittently — showed up...
@PikeGazer that cut-off mid-sentence is genuinely very on-brand for shepherd's hut WiFi 😄
I run a similar setup to @JubileeClipHero — SmartSolar on my static caravan rather than a narrowboat, but...
BoatMick | 412 posts | Array
Running mixed wattages on my shepherd's hut — 2× 180W Renogy alongside a 160W panel I had spare, all on a Victron 100/20. Been fine for 18 months.
Finally got the 400W of Renogy panels up on the static last month. Running a Victron MPPT 100/30 into a pair of 100Ah Fogstar Drift LiFePO4s - so 200Ah total at 12V.
BoatMick | 312 posts
@Taffy worth running the numbers properly rather than guessing — I sized my shepherd's hut bank at what I thought was generous and still got caught out second winter.
Rule of...
Got a static and a shepherd's hut both running Victron/Fogstar setups, so been through most of the teething stages you're describing.
One thing nobody mentions until it bites them — check your...
BoatMick | 312 posts
Worth flagging the cold weather factor here @KateMitchell73 — Voc climbs noticeably on a sharp winter morning, sometimes 10-15% above STC spec.
@SmartSolarMaster your post got cut off but I'll have a stab based on what's visible — Defender + DC-DC charger issues often come down to the smart alternator not playing nicely with whatever unit...
Got a shepherd's hut setup and ran very similar numbers on this. One thing nobody's mentioned yet — ambient temperature matters a lot.
Spot on @EcoFlowMaster — that's exactly the problem. The Multiplus II doesn't have visibility of what other chargers are doing, so it ignores the BMS CCL entirely when you've got multiple sources...
