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Had this exact issue last summer with my cabin setup. The MPPT will cut absorption short if it reckons the battery is already close to full — it's called adaptive absorption and it's on by...
Been there with this exact headache. Single leisure battery just doesn't cut it for a compressor fridge overnight — you're looking at roughly 30-50Ah consumed depending on ambient temp, and most...
Been through exactly this with my garden office build — ran a Victron IP65 12/15 alongside a 100/30 MPPT for about eight months before I finally got the settings dialled in properly. The thing...
ExFarmer90 in Batteries & BMS 1 month ago
@ZFS_OffGrid did you rule out temperature compensation being off? My Victron MPPT on the motorhome was doing exactly this — cracking sunny days but charge dropping off early.
Done this twice on my narrowboat — once with a Fogstar pack that spent eight months in a bilge sulking harder than my ex. Key thing nobody's mentioned: check your BMS supply voltage separately...
RetiredChef in Batteries & BMS 1 month ago
@Taffy62 that's a proper project that. I've been tempted myself — got an old Bosch drum motor sat in the garage doing nothing. Few questions if you don't mind: What pole count did you end up with...
Wonky Mender in On a Budget 1 month ago
Been down this rabbit hole recently with my garden office setup and figured others might be wrestling with the same thing. Got an EasySolar II running the office and I want to use Node-RED to...
Really interesting thread this! Got a static caravan setup with a Multiplus 2 and I've been curious about this exact thing but haven't got round to AC coupling yet — planning to add a grid-tie...
Been wrestling with a similar headache on my own setup — Multiplus-II 48V/5000, Cerbo GX, SmartShunt, and a bank of Fogstar Drift 100Ah LiFePO4 cells.
@DalesCruiser both sources need to see each other or you'll end up with the MPPT doing all the heavy lifting while the IP22 sits there thinking it's already finished — learned this the hard way on...
Been going back and forth on this one for a while, so figured I'd throw it out to the community. Running a Victron EasySolar-II GX 48/5000 paired with a Fogstar Drift 48V battery bank (two units...
Trigger in Batteries & BMS 1 month ago
@Fogstar_Fan worth also checking your alternator output voltage under load — if it's dropping below the Orion's input threshold (typically 13.2V for a 12V system), it'll shut down and look exactly...
Ducato Solar in DC-DC Chargers 1 month ago
Good sizing question — this catches a lot of people out. Start with your daily consumption in Wh. Pull your electricity bill and divide annual kWh by 365, or better yet, stick a plug-in energy...
CamperGeek in Batteries & BMS 1 month ago
Really useful thread this. One thing worth adding that I don't think has been mentioned yet — check your input voltage is staying stable during those long runs.
T6 Dream in DC-DC Chargers 1 month ago
Not a garden office specifically but I've dealt with the same nightmare in my tiny house build — even with 100mm PIR in the walls and roof it turns into a literal oven by mid-afternoon in July.
EcoFlowMaster in Garden Offices 1 month ago
Had this exact issue last winter with my Orion-Tr Smart 30A. Turned out my alternator voltage was dropping slightly under load on long runs — the Orion was seeing it as a "weak" source...
Crafter Solar in DC-DC Chargers 1 month ago
Great point from @CliveKnight on the surge — definitely worth knowing your inverter's peak handling capacity if you're running AC. One thing I'd add specifically for narrowboat use: ambient...
Tony Ross in Q&A 1 month ago
@OffGridTerry @SussexBoater has hit the nail on the head with that analogy! What you actually want for a fully islanded setup is the Multiplus-II in standalone inverter/charger mode rather than...
CamperRachel | 847 posts | ⚡ Solar Enthusiast @LiamFrost70 yes, absolutely had this with my converted garden office last year!
Camper Rachel in Garden Offices 1 month ago
Running this exact combo in my shepherd's hut — Victron SmartSolar 75/15 with a 100Ah Fogstar DIY LFP pack and JK BMS. One thing nobody's mentioned yet: absorption time.