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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
@DalesOffGrid — adding to what the others have said about editing the post, but whilst you're sorting that out, one thing worth flagging early for a multi-building setup: voltage drop across long...
Curly in Q&A 2 months ago
@WattKaren the flashing "mains on" light usually means the Multiplus is detecting grid on AC-in but hasn't fully synchronised yet, or the grid quality is falling outside the accepted...
Dai Young in Q&A 2 months ago
Been down this rabbit hole extensively. The short answer is: yes, it works, but with significant caveats that most YouTube tutorials conveniently skip over. Washing machine motors (particularly...
Fenland Solar in On a Budget 2 months ago
Been meaning to write this up properly for ages after digging into this on my shepherd's hut build last winter. From what I've observed with my Victron MPPT 75|10, the load output turn-on sequence...
Battery Barry in Batteries & BMS 2 months ago
@NorfolkDweller had this on my garden office setup when I first commissioned it. Turned out my BMS Connection setting in VEConfigure was set to "None" instead of "VE.Bus BMS" —...
Golden Socket in Batteries & BMS 2 months ago
Had this exact saga with my 100/30 last summer — turned out my Fogstar 100Ah LiFePO4 had a dodgy BMS that was throttling charge current early, and the Victron was just doing what it was told, the...
My Victron MPPT did the exact same thing on the boat last August — turned out the temp sensor cable had worked loose and it was "protecting" itself based on phantom readings like a drama...
Boat Mark in Batteries & BMS 2 months ago
@OakSoul the £18 ones are basically a lottery aren't they. I ran one for about 8 months on my garden office setup before it started misreporting battery voltage — showing 13.8v when my Victron BMV...
Berlingo Solar in On a Budget 2 months ago
@GlenDoug this caught me out too when I first wired up my tiny house setup. The USB ports on that controller are independent of the load output — they draw directly from the battery regardless of...
Great thread, this one! I had almost identical drama when I first tried running a water pump from my MultiPlus in the van — the inverter would just throw its hands up and refuse. What nobody's...
What @Rob1963 said tracks with my experience. I've got a similar setup in my shepherd's hut — 200Ah LiFePO4 running a small chest freezer and it's genuinely fine overnight, but I'd say insulation...
Marsh Lover in Q&A 2 months ago
@ExFirefighter11 so your alternator is basically doing a convincing impression of me on a Monday morning — full of promise, then immediately underperforming when things heat up. Seriously though,...
Renogy_Nerd in DC-DC Chargers 2 months ago
Really glad someone else has raised this — it's something I've been wrestling with on my Vivaro build for a couple of months now. My setup uses a JK BMS on a DIY 280Ah LiFePO4 pack (Fogstar...
@HY_OffGrid the key thing I'd check first is whether your alternator is "smart" (variable voltage) or a conventional fixed-voltage unit.
T6 Project in DC-DC Chargers 2 months ago
@Taffy @DownsCruiser — couldn't agree more on the boat front. Three years on my narrowboat with a Victron Smart BMS talking directly to my Multiplus II, and it's saved my bacon more than once.
Had almost the identical thing happen on my boat last winter — woke up to the Victron BMV-712 screaming at me showing 18% state of charge, yet I'd only had the anchor light and bilge pump float...
Carl Walker in Batteries & BMS 2 months ago