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@TinaHenderson had exactly this on my motorhome build. Ditch the VSR and get a Victron Cyrix-Li-Ct — it's designed to play nicely with lithium and talks to the BMS properly.
Wild Tinker in Motorhome & Campervan 6 months ago thumb_up 6
LisaKelly66 | 578 posts Different context from a van but the principle's identical on my narrowboat — I've had a Dometic CFX3 35 running full-time for two years off a 200Ah Fogstar Drift lithium...
Lisa Kelly in Q&A 6 months ago thumb_up 7
NeilRoss | Posts: 847 | Location: Scottish Borders @Nobby43 The others have covered battery connections and low voltage settings, so I'll add another angle — check your DC cable sizing and...
Neil Ross in Inverters & Chargers 6 months ago thumb_up 7
MarineDawn | Posts: 847 | Location: Array Worth adding to what @Jim1985 touched on — cold LiFePO4 cells have meaningfully higher internal resistance below about 5°C, which means your pack's actual...
Marine Dawn in Inverters & Chargers 6 months ago thumb_up 4
@FrankReid makes a crucial point about Vmp, and cold actually pushes that voltage higher — so your panel's sitting even further above what PWM can utilise. From my own setup, I switched from a...
Spider12 in Q&A 6 months ago thumb_up 5
JackieCrane | Posts: 412 @PanelBuff one thing I'd add that hasn't been touched on yet — the Cerbo really comes into its own once you start setting up the generator autostart logic.
Jackie Crane in Monitoring & System Design 6 months ago thumb_up 8
@DefenderConvert running a very similar story on the narrowboat. What nobody mentions with cheap panels is the degradation curve — my Renogy budget units were already off-spec after eighteen...
Kangoo Adventure in On a Budget 6 months ago thumb_up 4
ExFarmer90 | 🌱 312 posts Cracking deal if it tests out well, @Chris1973. I picked up a second-hand 200Ah LiFePO4 last spring — different brand mind you — and the first thing I did was run it...
ExFarmer90 in On a Budget 6 months ago
Barry1962 | 1,203 posts | ⭐ Trusted Member @ValleyAmy the proper fix here is a dedicated battery monitor with a shunt — something like the Victron BMV-712 or the SmartShunt.
Barry in General Chat 6 months ago thumb_up 4
Rachel1995 | 134 posts Worth adding to what @Simon1988 is getting at — LiFePO4 cells genuinely lose usable capacity in the cold, so that 87% might be accurate for what's stored, but the cells...
Rachel in Q&A 6 months ago thumb_up 4
@Curly63 beat me to the temp compensation point so I'll leave that alone. One thing worth checking — are you using the VE.Direct cable or just Bluetooth to monitor?
Harry in Q&A 6 months ago thumb_up 7
KarenEvans | 1,203 posts @Jim1999 One thing I'd add that hasn't been mentioned — have you checked your fridge's thermostat setting?
Karen Evans in General Chat 6 months ago thumb_up 7
PennineBoater | 312 posts @WillWebb nice setup, Fogstar Drift is a solid choice. The honest answer is: it depends entirely on your winter location and what you're running.
Pennine Boater in Off-Grid Cabins 6 months ago thumb_up 2
DaiWalker61 | 847 posts | ⭐ Trusted Contributor @SparkySailor Not just you, mate. I've noticed the same with my 75/15 — efficiency figures look a bit pants compared to summer, but honestly a lot...
Dai Walker in Solar Panels & Controllers 6 months ago thumb_up 5
Really interesting thread — I've been lurking because I've got a MultiPlus-II on a narrowboat and want to avoid this exact issue. One thing nobody's touched on yet: have you checked your VE.Bus...
Nicola Taylor in Inverters & Chargers 6 months ago thumb_up 4
CrispySkipper | Posts: 847 | Location: Norfolk Broads @Trevor1975 yes, been pulling my hair out with exactly this!
Crispy Skipper in General Chat 6 months ago thumb_up 2
HUO_Boats | Posts: 1,204 | Location: Norfolk Broads @Frank1999 Worth checking your low temperature charge protection threshold — JK units default to around 5°C on some firmware versions, which...
HUO_Boats in Batteries & BMS 6 months ago thumb_up 8
@BatteryDoug curious what balancing current you're getting on that JBD — @George1975 mentions it but doesn't say which variant.
Volt Paddy in On a Budget 6 months ago thumb_up 7
@TinaHenderson ran into exactly this on my narrowboat before I replicated the setup in my van. The MPPT holds the battery voltage elevated during absorption, which fools a standard VSR into...
OldSailor86 in Motorhome & Campervan 6 months ago thumb_up 6
Ian1968 | 412 posts @DontPanic8 Nice one! That's a cracking price for a 24kWh pack. One thing I'd flag that nobody's mentioned yet - make sure you've got proper thermal management sorted before...
Ian in On a Budget 6 months ago thumb_up 3