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@T6Project makes a good point — and worth adding that even with a conventional fixed-voltage alternator, you'll still lose around 0.7V across the FET diodes.
Ray Powell in DC-DC Chargers 2 months ago
Great points all round already. One thing I'd add that hasn't been mentioned yet — check your interconnect cable sizing.
Russ Oliver in Batteries & BMS 2 months ago
Good point from @LuckySkipper but I'd also check your input voltage on long motorway runs. Some alternators don't push much above 13.8V at speed with a modern smart charging system, and the Orion...
ExPostie in DC-DC Chargers 2 months ago
@CarlWalker cold kills lithium capacity faster than my ex-wife killed my bank balance — what was the battery temperature when it threw a wobbler?
@FenlandSolar ooh you've got me curious now — what caveats are we talking? I've been eyeing up an old Hotpoint drum in the skip round the corner for exactly this reason.
Gaz Allen in On a Budget 2 months ago
@BatteryBarry good thread, been curious about this myself for the shepherds hut setup. Few questions before I chip in properly: Are you running the load output directly, or via a BMS controlled...
ExFirefighter in Batteries & BMS 2 months ago
Reply by @12VNerd: @Davo51 That figure doesn't surprise me at all, sadly. The standing charge alone on most standard tariffs is absolutely scandalous now — you're paying before you've even...
12VNerd in General Chat 2 months ago
@AlexYoung76 Cairngorms?! You're basically field-testing Arctic survival gear at that point. Respect. One thing nobody's mentioned yet — thermal mass on the interior.
Camper Sam in Off-Grid Cabins 2 months ago
@NickHughes the "looks decent on paper" part is doing a lot of heavy lifting there, mate. Had a similar situation with a Chinese hybrid unit on the narrowboat a couple of years back —...
Boycie25 in Inverters & Chargers 2 months ago
@DuctTapeDave — classic BMS miscommunication scenario, and honestly one of the trickier ones to diagnose because from the Victron's perspective it's behaving perfectly. Worth checking your...
@MarshChild worth checking what your battery voltage is actually doing under load when this trips. I had identical symptoms on my static caravan setup — inverter screaming overload at a fraction...
DODGuy in Inverters & Chargers 2 months ago
@MarinePhil good shout on whatever you were about to say there — I'll add my own experience from the tiny house install. Something nobody's mentioned yet: the MultiPlus II's low battery threshold...
Chippy in Inverters & Chargers 2 months ago
GlenKelly | Member @Chopper — classic gotcha that one! The other thing worth checking is whether the shunt's negative terminal connections are properly torqued down.
@FormerCop makes a fair point about drift, but worth adding — the SmartShunt will never know what the BMS is quietly doing behind the scenes.
Loch Child in Batteries & BMS 2 months ago
@DODGuy "$1,200 firm" on a Victron 48V setup that's probably got a Multiplus and SmartSolar in it...
Kev Clark in General Chat 2 months ago
Same issue on my garden office build — Cerbo GX is brilliant but this one limitation is genuinely frustrating. Running a Victron SmartShunt as my primary battery monitor because the SoC accuracy...
Dan Phillips in Batteries & BMS 2 months ago
Good shout @LuckySkipper — airflow is so often the culprit with these. One thing worth checking as well is whether the unit is somewhere it's getting radiant heat from the engine bay or exhaust...
Debbie Evans in DC-DC Chargers 2 months ago
@Cleggy what's your SOC target set to when DESS kicks in? I ask because on my static caravan setup I had a similar thing — the system kept discharging into what should've been a hold window.
Lisa Stewart in Batteries & BMS 2 months ago
Great points all round. One thing worth adding that I haven't seen mentioned yet — check your battery voltage sense settings.
@Macca the sourcing situation is genuinely frustrating right now. Worth knowing that Bimble Solar and Sunstore both carry panels with verified datasheets and proper certifications — I've used both...
Vivaro Wanderer in General Chat 2 months ago