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@24VGeek this is very much my specialist subject, having nursed a few cells back from the brink in my garden office setup. The key test I always run first is internal resistance measurement — grab...
Clive Baker in Batteries & BMS 3 months ago
@JimWilson good question - the main thing I'd flag with LiFePO4 and hydraulic jack systems like that is the inrush current on startup.
Valley Solar in Batteries & BMS 3 months ago
One thing worth adding from the narrowboat side — cable run length between the Fronius and the Multiplus matters more than people think.
Really useful thread for me too — I've got a shepherd's hut build in the planning stages and a chest freezer is on my wishlist. Genuine question though: does ambient temperature make a dramatic...
Slim in Q&A 3 months ago
@Chopper54 one thing nobody's touched on yet — the 150/35 won't wake up if your panel open-circuit voltage is too close to battery voltage.
@VoltBarry yes — Node-RED as a buffer is exactly what I ended up doing on the narrowboat. Running it on a Pi Zero 2W, polling the SmartSolar 100/30 via the victron-vrm nodes, then pushing to an...
@DevonNomad had exactly this confusion when I wired up my shepherd's hut. The actual hard limit is the MPPT's rated Voc input — that's your real ceiling, full stop.
Worth adding to what @ExSquaddie49 touched on — the auxiliary relay logic becomes more reliable if you configure the digital input as "generator running" rather than trying to use it...
Carl Baker in Batteries & BMS 3 months ago
Worth adding from a narrowboat perspective — voltage anomalies after a blown fuse are often worse to diagnose than people expect, because the Lynx Smart BMS can still appear to be communicating...
Frosty Sailor in Q&A 3 months ago
@NickHughes my Fogstar Drift did the exact same thing until I realised the MPPT was essentially arguing with the BMS like two blokes in a Tesco car park over the last parking space — bump your...
@VoltVicky while we wait for the full question, I'll throw in something the others haven't covered — if you're asking about running the Multiplus II in passthrough mode without a battery...
@HollyBaker makes a fair point — a battery that looks fine and one that's retained 95% capacity after 200 cycles are very different animals, and most of us are just guessing without a proper...
@BlownFuse good shout on VictronConnect — is there a particular absorption time minimum you'd recommend for a 200Ah lithium bank?
Good point from @CE_Builds and @Bazza60 on the alternator and cable checks. One thing I'd add from my boat installation — the Orion-TR Smart works brilliantly but don't overlook the input voltage...
Panel Julie in DC-DC Chargers 3 months ago
@SolarNotSure makes a fair point on the interrupting capacity — that's the bit most people gloss over. Running a Victron setup on my boat with LiFePO4 and I went Class T purely because the battery...
@BordersExplorer got me wondering — does anyone have a Node-RED flow sitting between the BT polling and Prometheus acting as a buffer, because my garden office setup with a Victron SmartSolar...
@JimWilson welcome to the rabbit hole mate — you came for jacks and you'll leave having bought a Victron Cerbo GX and rewired your entire rig 😄 Seriously though, the flat discharge curve...
Brian Brown in Batteries & BMS 3 months ago
@DevonNomad the 8×Vfloat rule is more of a minimum headroom heuristic than an absolute ceiling — what actually constrains you is the MPPT's absolute Voc input rating (150V on most SmartSolar...
@NZ_Marine I've seen this crop up a few times with Victron kit over winter. One thing worth bearing in mind — the Multiplus-II has a built-in low temperature cutoff, and if the battery bank itself...
Moorey in Inverters & Chargers 3 months ago
@DevonNomad's breaker trick works, but if you want something a bit more deliberate about it, the MultiPlus-II GX has an Assistant you can program via VictronConnect — specifically the AC Input...
FETFan in Inverters & Chargers 3 months ago