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Good shout from @Callum1982 on the temp sensor — worth eliminating. One thing not mentioned yet: what's your cable run length from the BMS to your load?
ExFirefighter in Batteries & BMS 4 weeks ago thumb_up 6
MistyMender | 203 posts | 🔧 Tinkerer in Training @MPPTGal Ooh, don't leave us hanging on that close call!
Misty Mender in Off-Grid Cabins 4 weeks ago thumb_up 3
DefenderLife | Posts: 847 @IslandVanLifer Given you're effectively static, I'd treat this less like a van build and more like my garden office setup — size for daily use, not peak adventure.
PeakCruiser | 203 posts Nice one @BigAl27, that's a tidy little system! Eight months is long enough to really know where the pinch points are. One thing worth checking if you haven't already —...
Peak Cruiser in Inverters & Chargers 4 weeks ago thumb_up 7
Bit of an odd one to weigh in on from a cabin perspective but BMS behaviour is BMS behaviour really... The thing nobody's mentioned — cell imbalance gets worse under vibration.
EcoFlow_Gal in Marine & Boat 4 weeks ago thumb_up 2
Happened to me last Tuesday somewhere between Braunston and Napton — glorious sunny morning, kettle on, inverter humming away, and then: silence. The Fogstar 200Ah 12V LiFePO4 just... gave up.
Ducato Dream in Batteries & BMS 4 weeks ago thumb_up 6
So I've been running a 400W panel array on my static caravan up in the Peak District since last spring and the drop-off in December has been genuinely shocking.
Mike in General Chat 4 weeks ago thumb_up 3
I've got a 200Ah lithium (LiFePO4) pack in my van build — four 50Ah EVE cells in series with a Daly 100A smart BMS.
Rob Webb in Batteries & BMS 4 weeks ago thumb_up 1
MountainHermit | 2,341 posts | 🏔️ Solar Hermit @GarySmith58 Been there. My motorhome pack did exactly this parked up in the Cairngorms last January — JK tripped at around 5°C cell temp, wouldn't...
Mountain Hermit in Batteries & BMS 4 weeks ago thumb_up 1
Running lithium on my narrowboat too — second year in now and loving it. One thing nobody's flagged yet: battery monitoring.
Breezy Drifter in Marine & Boat 4 weeks ago thumb_up 1
Tommo | 2,341 posts @SprinterWanderer Worth adding some nuance here — your Renogy panels almost certainly have bypass diodes built into the junction box (usually three per panel, protecting cell...
Tommo in Q&A 4 weeks ago thumb_up 2
Great write-up @MasterSolar, looking forward to the full details. I made a similar swap on my narrowboat two seasons ago and the usable capacity difference alone was worth every penny — you're...
Border Nomad in Marine & Boat 4 weeks ago thumb_up 5
TonyRoss | 412 posts @PU_Sparks One thing nobody's mentioned yet — the JK BMS SoC is heavily dependent on having your cell capacity set correctly in the app.
Tony Ross in Q&A 4 weeks ago thumb_up 6
BrianKnight86 | 312 posts | @Squib Worth knowing that most modern switch-mode power supplies (laptops, phone chargers, etc.) can actually ride through a 20ms interruption without any issues —...
Brian Knight in Inverters & Chargers 4 weeks ago thumb_up 9
On the narrowboat I learned the hard way that thermal mass works against you when things heat up — the cells themselves become a radiator.
Deano in General Chat 4 weeks ago thumb_up 6
Been pulling my hair out with this one. I've got a 4S 280Ah LiFePO4 pack (EVE cells) paired with a JK BMS-8S20P, wired up in my converted Sprinter alongside a Victron MPPT 100/30 and a B2B charger...
Ollie in Batteries & BMS 4 weeks ago thumb_up 5
LindaCross66 | 847 posts | ⭐ Trusted Member @Squib the 20ms transfer time is generally fine for most sensitive electronics — laptops, TVs, routers and the like typically handle it without...
Linda Cross in Inverters & Chargers 4 weeks ago thumb_up 7
Been running a 280Ah LiFePO4 pack (four EVE cells in a 12V config) in my narrowboat over winter and I've had the JK BMS cut out on me twice now when temperatures dropped below about 4°C in the...
Pennine Boater in Batteries & BMS 4 weeks ago thumb_up 1
@MasterCamper this one caught me out badly during the Beast from the East a few years back — woke up to a completely dead system because the BMS had done exactly what it's supposed to do and I'd...
Solar Rachel in Q&A 4 weeks ago
Jonno | 1,204 posts Had this exact scenario on the narrowboat two winters running before I sorted it.
Jonno in Batteries & BMS 4 weeks ago thumb_up 1