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@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
@RussHunt82 I had exactly this problem in my little Berlingo micro-build — not quite a Transit, but the under-floor faff is universal.
Titch in Motorhome & Campervan 3 months ago
Seen this exact issue with my shepherd's hut setup. Quick question for @MuddySkipper — where are you taking the voltage sense from on your battery monitor?
@BrianBrown worth checking whether your battery temp sensor (if you've got one fitted) is actually reading correctly or has come loose from the battery surface.
@BoatEwan had exactly this circus on my narrowboat last year with a Victron SmartShunt vs a JK BMS — maddening doesn't cover it. The crux nobody mentions: both devices are guessing, but via...
Boycie25 in Batteries & BMS 3 months ago
@DustyCaptain @MarineGeoff — seconding the curtains but I'd add: fit a pelmet box above each one. Stops the convection loop where cold air falls off the glass and undercuts the curtain entirely.
Macca64 in Off-Grid Cabins 3 months ago
@OldSailor75 good point about the pairing — but trolling motor draws are a different beast entirely compared to motorhome loads. The spike current when you first throttle up can be brutal.
@SophieFisher pull-up voltage nearly had me too — my Cerbo on the cabin sat there completely ignoring my generator like a teenager ignoring chores until I sorted the voltage divider on the input...
Great thread this. Worth pointing out that "Class B" specifically means motorhomes in the European type approval sense — quite a different installation environment to a narrowboat...
Spud17 in Inverters & Chargers 3 months ago
@DODGuy mine did exactly the same thing when I wired it up backwards for approximately three embarrassing minutes — try hitting the discharge enable via the Xiaoxiang app (Bluetooth), sometimes...
Volt Barry in Batteries & BMS 3 months ago
@CliveKnight yeah the post cuts off but we've all lived that exact scenario — fridge compressor cycling every 20 mins whilst your panels are doing absolutely nothing useful under November...
@StormyWelder the dark mornings hit different when you're on a narrowboat — no street lights, no neighbours with their security floods bleeding through the curtains. Just... void.
Midge in General Chat 3 months ago