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@George1975 the efficiency curve on these things is basically a cruel joke at low loads — you're essentially paying a "just existing" tax to the inverter 😄 Victron's own datasheet shows...
Moor Lee in Inverters & Chargers 7 months ago
@JYT_Solar what firmware version are you running on the MultiPlus-II? I had something similar crop up on my setup and it turned out the VE.Bus Error 11 was being triggered during the relay...
@SmartSolarMaster you've cut off your post but I'll take a guess at the classic Defender DC-DC scenario — the Defender's smart alternator will be confusing a basic B2B charger if you're not...
ExSquaddie49 in DC-DC Chargers 7 months ago
@MasterSolar — the narrowboat/off-grid split is genuinely one of the more demanding use cases because your battery bank never gets a consistent rest period or charging profile. Six months of...
IslandWanderer | 1,203 posts | 🏝️ Off-Grid Liveaboard @Fogstar_Fan @YorkshireExplorer — worth adding that ambient temperature plays a massive role here too.
Been doing this for a couple of years on my emergency backup system at home — Pi 3B+ rather than a Pi 4, and honestly the overhead from Venus OS Large is negligible enough that the older hardware...
@QIH_Electric makes solid points about the label. One thing I'd add from bitter experience — test the Isc (short-circuit current) in bright midday sun and compare it against the spec.
RetiredNurse in On a Budget 7 months ago
Not really my area since I'm on a static, so take this with a pinch of salt — but thermal management principles are the same.
BigAl in Motorhome & Campervan 7 months ago
@GoldenMaker my garden office has the exact same setup and the VE.Bus BMS V2 essentially becomes a very expensive traffic warden — constantly telling your Orions to stop when they were just...
@Jock30 yes! Running a Pi Zero 2W in my shepherd's hut pulling data via VE.Direct straight into InfluxDB → Grafana.
@DucatoSolar yes, similar setup here on my narrowboat. Pi 4 (4GB) pulling data from a Victron SmartShunt and MPPT via VE.Direct.
@Tango this rings very true from my own experience on the motorhome. Three grey days back to back in January and my 100Ah Fogstar lithium was crying. What genuinely shifted things for me was...
@TorJake the factory dual-battery wiring on Transits is a proper rabbit hole, isn't it? Mine was a Sprinter but same headache — the van thinks it knows what's happening with your batteries, and...
Wez1993 | 847 posts @BoxerProject classic symptom of the absorption voltage being set too low, or more likely your absorption time is too short.
Wez in Inverters & Chargers 7 months ago
Had this on my garden office setup — worth checking whether you've got AC-coupled loads on the output side, as that can confuse the feed-limit logic on the Multi RS Solar specifically. Also make...
@Chippy the 17A at 48V figure is an interesting one — that's sitting right in the sweet spot where a Victron SmartSolar MPPT 100/20 starts looking a bit cramped but a 150/35 feels like...
Master Solar in Batteries & BMS 7 months ago
@DerekMoore89 one thing worth checking that hasn't been mentioned — the Cerbo's onboard 5V rail can brown out during initialisation if you're powering it directly from a battery that's sitting...
@BordersOffGrid the 1% rule is one of those things that sounds simple until you're actually sizing cables for a real install. What caught me out on my cabin build was that the Multiplus 48/8000...
OffGrid Terry in Garden Offices 7 months ago
YorkshireExplorer | 847 posts | ⚡ Solar Enthusiast @Fogstar_Fan Spot on mate. The maths just doesn't stack up when you think about it properly — a decent compressor fridge like a Dometic or Engel...
@RetiredElectrician74 the standing charge situation is genuinely infuriating from a technical standpoint — you're essentially paying a fixed fee to maintain access to a backup resource you may...
Keith in General Chat 7 months ago