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Really glad this thread came up — been dealing with this exact issue in my 6x4m timber cabin up in the Cairngorms. One thing nobody's mentioned yet: reflective foil behind your radiators or heat...
Alex Young in Off-Grid Cabins 3 months ago
@RussHunt82 three weekends and you didn't once consider just... sleeping somewhere else and giving the battery the bed?
@FellLover already did the maths so I won't bore you, but nobody ever actually runs these at full whack anyway — my 12/3000 lives on a Fogstar 200Ah and the laziest solar setup in the Northern...
@Spud17 fair point on the Class B clarification — worth keeping that distinction tight. For a motorhome context specifically, the Multiplus II wins on integration if you're running a Victron...
Done this exact dance with a temperamental micro-hydro feed in my motorhome setup — the magic checkbox everyone skips is "Accept wide input frequency range" in VEConfigure under the AC...
Good shout from @RetiredEngineer86 — worth expanding on why this happens technically. The Lynx Smart BMS derives its voltage reading from the sense wires, not the main busbars.
Borders Explorer in Q&A 3 months ago
@Renogy_Nerd makes a solid point re: BMS dictating the run. Worth adding — keep those cell-to-cell interconnects as short and equal length as possible too.
Dizzy70 in Batteries & BMS 3 months ago
Really interesting thread this. Worth adding that the SmartShunt's accuracy lives or dies by how well you've configured the charged voltage threshold and tail current settings — if those are even...
Rhys Thompson in Batteries & BMS 3 months ago
@LH_Marine the culprit is almost certainly the tail current setting — Victron defaults this to 4% of battery capacity, which on a 200Ah bank means it exits absorption the moment charge current...
Something similar happened to me last winter parked up in the Cairngorms — woke up to the Renogy showing all sorts of nonsense despite the batteries being absolutely fine when I checked them with...
@Tommo quick question on this — when you say no power showing in GX/VRM, is the VM-3P75CT appearing at all in the device list, or is it completely invisible?
@PaulaFisher91 @Spider — oh, this thread is pulling up some memories. When my narrowboat BMS threw a wobbler last autumn, I scrambled to throw in a pair of AGMs as a stopgap, and the MPPT...
Midge in Batteries & BMS 3 months ago
If the MOSFETs are stuck in protection mode, a 3.6V lithium cell briefly touched across the output terminals (positive to positive) sometimes gives it the "kick" it needs to wake the...
ExPostie86 in Batteries & BMS 3 months ago
@HazelDawn the Caledonian Canal corridor is genuinely brutal — I've parked the motorhome near Loch Ness in October and watched my Victron MPPT log barely 150Wh across an entire day despite...
@LisaStewart71 worth noting the JK's CAN protocol doesn't always play nicely out of the box with Luxpower — you'll likely need to set the BMS protocol in the Luxpower settings to...
BMS_Geek in Inverters & Chargers 3 months ago
Good points from @OldSailor75 and @MountainHermit. One thing worth clarifying for the OP — trolling motor peak draw can be brutal.
BlownFuse in Batteries & BMS 3 months ago
@DustyCaptain covered the theory but forgot to mention that your BMS rating dictates everything — no point running 95mm² cable to a 100A BMS that'll throttle you anyway, which is exactly the...
Renogy_Nerd in Batteries & BMS 3 months ago
@VoltVicky this is actually pretty common with lithium and not necessarily a fault. The voltage curve on LiFePO4 is incredibly flat through the mid-range, so your BMS is essentially guessing at...
Mark in Batteries & BMS 3 months ago
@Midge absolutely this — I'm on the cut too and by 7am in November you're basically operating by headtorch unless you've got decent 12V lighting sorted throughout.
Pennine Nomad in General Chat 3 months ago
Had this exact issue with my static van setup last summer. Worth checking if the BMS needs a charge source connected first to wake the discharge FETs — some of the Xiaoxiang units won't enable the...
HY_OffGrid in Batteries & BMS 3 months ago