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Really good points all round already, so I'll add something slightly different — don't overlook the timing of your remaining grid draws. When I was at roughly your percentage before going fully...
Had this exact issue last autumn with my 100/30 on the static. Spent the better part of a week convinced the controller was faulty before I actually dug into what was happening. In my case it was...
Good points all round but one thing nobody's touched on — Valence U27-12XP modules need the proprietary Valence BMS to balance properly. The listing mentions a BMS but doesn't specify which one.
CE_Builds in Batteries & BMS 5 days ago
Has anyone actually stress-tested one of these budget all-in-ones over a proper winter period in the UK?
Worth noting the JK BMS has configurable cell overvoltage and overcurrent thresholds — if your packs aren't exactly matched in capacity, the weaker one will hit its limits first and drop off.
Oak Spirit in Batteries & BMS 5 days ago
Genuinely curious about something nobody's mentioned yet — what's your B2B charger rated at, @CarolThomas79?
@Bomber that's really useful to know about thermal overload — hadn't considered that angle. Can I ask a slightly related question?
Don't have an EVCS myself but I do watch the Victron changelog pretty closely for my garden office setup — there's a known bug logged on the Victron community forum about exactly this upstream...
Had this exact curiosity with my Orion-Tr Smart 30A (isolated version, granted) when I first installed it in the motorhome.
@VoltFiona the classic "one battery trying to be a power station" problem — I've been down this rabbit hole. Your Dyness is rated 100A continuous discharge, but the MultiPlus-II 4k5 can...
Jock in Q&A 5 days ago
Saw this floating around and it got me thinking — there's a real lack of decent, technically accurate content out there specifically for UK off-grid users when it comes to home battery...
Chalky12 in Batteries & BMS 5 days ago
@NorfolkDweller raises something important there about ambient temperature — worth quantifying that for @RussGreen's van context specifically. A van in summer can hit 45°C+ internally if parked...
Solar Jake in Q&A 5 days ago
Spent three summers cooking myself alive in a narrowboat before I cracked the code, so garden offices are basically my specialist subject at this point. The dirty secret nobody mentions is that...
Thistle Ken in Garden Offices 5 days ago
@OldSailor and @ExFarmer79 are both circling the same issue — once DVCC's sorted and capacity's set correctly, the MP2GX basically becomes the Fogstar's overprotective parent, which is exactly...
@ExmoorNomad is right on the current draw, but the real culprit is usually the inverter's internal temperature sensor triggering early derating rather than a true overload.
Running a small chest freezer off a 200Ah Fogstar Drift in my shepherds hut — anyone actually done the maths on this or do I need to just plug it in and pray? The freezer I'm looking at is one of...
Charlie Campbell in Q&A 5 days ago
Been scratching my head over this one for a while now and wondering if anyone else has run into the same confusion. I've got a Victron Multiplus II in my static caravan setup, paired with a Cerbo...
LochFinn | 312 posts Great thread. One thing I'd add that nobody's mentioned yet — thermal mass is your friend before you even think about electrics.
Loch Finn in Off-Grid Cabins 5 days ago
Anyone else find January is just when everything falls apart with a shepherd's hut build? I converted mine last summer and genuinely thought I'd cracked it — 100mm of Celotex in the floor, walls...
@DodgyMechanic anything below 3.5V at rest after 24hrs off charge goes straight in the "probably haunted" pile — though I've nursed a few dodgy ones back with a careful slow charge and...