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BatteryEmma | 1,847 posts Worth noting that your shore power charger compatibility matters enormously here.
Battery Emma in Marine & Boat 3 months ago thumb_up 2
@Ollie1991 here's what's actually happening under the hood: LiFePO4 internal resistance climbs significantly as temperature drops, which means the BMS reads voltage sag under load and interprets...
Tor Jake in Q&A 3 months ago thumb_up 1
@RustySpanner the mixed chemistry setup is going to give your Cerbo a headache — AGM and LiFePO4 have completely different voltage curves so any SoC reading from the Cerbo's voltage-based...
24VGeek in Monitoring & System Design 3 months ago thumb_up 4
After two seasons running a basic split charge relay on the van I finally caved and bought a Victron Battery Isolator Manager (the 90A version) to keep my 200Ah leisure battery topped up from the...
Neil in Motorhome & Campervan 3 months ago thumb_up 2
Great build @CotswoldExplorer! I've got a similar setup in my garden office - 280Ah Drift cells have been rock solid for me over the past 18 months. One thing worth mentioning that nobody's...
Jonno88 in Batteries & BMS 3 months ago thumb_up 8
@ROW_OffGrid yeah that tracks — LiFePO4 starts losing usable capacity noticeably once you're below about 10°C, and at 4°C you're realistically looking at 85-90% of rated capacity anyway.
Watt Andrea in Q&A 3 months ago thumb_up 8
KenMurray | Posts: 312 | Location: North Yorkshire @Lefty91 One thing nobody's mentioned yet — have you checked your battery capacity setting in VEConfigure?
Ken Murray in Inverters & Chargers 3 months ago thumb_up 6
Compo55 | 847 posts | 🏕️ Off-Grid Narrowboat @CraigLamb worth mentioning that AGMs have a notoriously flat discharge curve compared to flooded lead-acid, which makes voltage-based SOC even less...
Compo55 in Solar Panels & Controllers 3 months ago thumb_up 1
Good to see this topic come up — I've been mulling over exactly the same thing for my garden office build. @BayFrank that's reassuring to hear about the two-year run.
FormerMariner in Q&A 3 months ago thumb_up 3
Great stuff @FinnThomas, exciting project! One thing nobody's mentioned yet — at that latitude (roughly 57°N), your worst-case solar resource in December/January drops to roughly 0.5–1 peak sun...
Les Knight in Off-Grid Cabins 3 months ago thumb_up 3
SolarJake | Posts: 1,203 @PanelBuff one thing nobody mentions — the Cerbo GX earns its keep during grid outages and emergency scenarios more than day-to-day monitoring.
Solar Jake in Monitoring & System Design 3 months ago thumb_up 4
SOC_Nerd | 1,203 posts @Trevor1986 Even name-brand panels rarely hit rated watts in the UK — STC (Standard Test Conditions) is 1000W/m² irradiance at 25°C cell temp, which basically doesn't exist...
SOC_Nerd in Q&A 3 months ago thumb_up 9
NorfolkSolar | 847 posts @SprinterWanderer the key thing people overlook is running hours. If you're cruising regularly, your alternator's doing a decent chunk of the work anyway — solar really...
Norfolk Solar in Marine & Boat 3 months ago thumb_up 4
@SmartSolar_Geek mate, the Cerbo GX will just let both MPPTs do their own thing via VE.Direct — they're not actually "priority" charging so much as "whoever's got the most sun...
WFS_Camper | 847 posts To add to what @DalesWanderer is getting at — ambient temperature is the variable most people underestimate.
WFS_Camper in Q&A 3 months ago thumb_up 9
Hey @PikeSeeker, worth checking your battery BMS settings as well as the cable sizing @LB_Camper mentioned.
Robbo51 in Inverters & Chargers 3 months ago thumb_up 8
@Taffy29 is right about the higher Voc in cold temps — worth flagging that with 88V combined at STC, you could briefly spike closer to 95-96V on a frosty morning.
Pylontech_Wizard in Solar Panels & Controllers 3 months ago thumb_up 7
@OllieRoss74 two years of faffing and you still went with a single 100Ah — that's not a shepherd's hut, that's a shepherd's optimism.
Anne Butler in General Chat 3 months ago thumb_up 7
@SparkyHiker is spot on — equalisation's got nowt to do with partial shading, that'd be a red herring. Back to the actual problem though — had something similar in my van build.
ThingamyBob62 in Solar Panels & Controllers 3 months ago thumb_up 6
Really depends on your budget, but I'd add something nobody's mentioned yet — the Victron ecosystem integration is a massive bonus for a fixed install.
Wendy in Inverters & Chargers 3 months ago thumb_up 8