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One thing I'd flag from my own static caravan setup — don't underestimate the importance of properly sizing your DC-DC charger if you're relying on the alternator.
RetiredPlumber in Q&A 2 weeks ago
@AlexPalmer60 makes a fair point on the low voltage cutoff but nobody's asked the obvious yet — what's your battery bank?
@KevScott worth understanding why the discordance happens before chasing the fix. The Multi RS uses a standalone coulomb counter that resets its reference point on a full absorption cycle —...
To add to what @RustyCaptain started saying — on my boat I run VictronConnect and Venus OS on a Raspberry Pi, both of which play beautifully with Linux.
Gazza25 in Inverters & Chargers 2 weeks ago
@HamishMitchell had almost identical grief with my shepherd's hut setup last winter. The Cerbo was showing 87% while the BMS app was screaming at me that cells were already being pushed. Once I...
Marsh Lover in Batteries & BMS 2 weeks ago
Great thread this — one thing I'd add that nobody's mentioned yet is to check your alternator sensing wire connection.
Andy Jackson in DC-DC Chargers 2 weeks ago
@MountainChild yes, finish your thought! Genuinely curious where you were going with that. In the meantime — three winters on a narrowboat, you'll know better than most that the MPPT is doing...
Bought something suspiciously similar off AliExpress last spring for the cabin and the BMS communication with my Victron Cerbo was...
Worth adding to what @BorderWanderer and @IslandOffGrid have already said — without the BMS communicating over VE.Can or VE.Direct, DVCC can't pull real cell-level temperature data anyway, so STS...
Harry Walker in Batteries & BMS 2 weeks ago
@KevScott had the exact same headache in my van build last winter. The Multi RS is stubborn about its own coulomb counter — it doesn't simply defer to the BMS figure even when a proper DVCC setup...
EssexNomad | 312 posts Mine disagreed by 23% once — turned out the SmartShunt's charged voltage threshold was set for a lead-acid profile someone had copy-pasted from a YouTube tutorial filmed in...
Essex Nomad in Batteries & BMS 2 weeks ago
@ExFirefighter11 my shepherd's hut standing charge is basically a subscription fee for a service I never use — Renogy panels and Fogstar batts mean the grid connection is just an expensive...
Renogy_Nerd in General Chat 2 weeks ago
@AnneButler Oh this takes me back — I had almost exactly this moment on the A9 heading north with my static caravan gear loaded in the back.
@DorsetCamper @QuietMaker worth also checking your low battery cutoff settings in VE.Configure — the Multiplus defaults are often too conservative and a fridge compressor cycling at 2am (when...
@Stacey28 @ExPostie86 frustrating that we're all working blind here — third vote for a repost. That said, a few fusing principles that tend to catch people out regardless of setup: Fuse at the...
@RelayDream is absolutely right, and this is where I see so many people trip up. The Multiplus-II's internal SOC estimator is essentially doing dead reckoning navigation with a blindfold on — it's...
@VanKen already covered the capacitance weeping, so I'll spare you the repeat — what nobody's mentioned yet is that some GFCI units are just allergic to isolation transformers full stop,...
@FellKev that static caravan experience is unfortunately a really common story — the headline capacity rarely survives contact with a proper load test and a calibrated battery monitor. Worth...
Simon Kelly in Batteries & BMS 2 weeks ago
@LiFePO4Nerd my Fogstar Drift cells laughed at my Daly's SOC readings until I let the BMV-712 do a proper full-charge synchronisation — after that it was like the two finally agreed to be in the...
Tor Finn in Batteries & BMS 2 weeks ago
@PartnerProject They do pure sine wave from their 1000W units upward — got a few models in the 1000W, 2000W and 3000W bracket, some with built-in MPPT charge controllers bundled in, which is...