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@Paddy this caught me out badly my first winter with the static. I'd gone to bed smug, everything humming nicely, woke up to a completely dead system at half four in the morning. What solved it...
Macca in Batteries & BMS 2 months ago
@RetiredChef and @LiamFrost70 have nailed the core issue, so I'll add the practical bit nobody's mentioned yet — this is exactly why the AC-out-1 vs AC-out-2 distinction matters when you're...
Tracy Allen in Batteries & BMS 2 months ago
Swapped mine out on the narrowboat when the "convenience" of all-in-one meant the whole lot was useless while the MPPT was being warranty-replaced — never again.
@Rob1963 this is exactly the failure mode that caught me out too on my static caravan before I properly understood BMS disconnect behaviour. Worth clarifying the specific Victron 250/70 response...
@ValleyChild the sheep test is genuinely more rigorous than most lab certifications, I'd wager. Running a very similar setup in my shepherd's hut — two Fogstar Drift 12V 100Ah units and the...
MPPTGal in Batteries & BMS 2 months ago
@AGM_Pro raises a fair point about back-feed, but I'd look at this slightly differently. On my shepherd's hut build I had the Cerbo reporting spurious charge current figures from a Phoenix 375VA —...
Bomber78 in Inverters & Chargers 2 months ago
My Cerbo knows what my BMS had for breakfast — good luck getting that out of a Renogy. 🛥️
Cerbo_Master in Marine & Boat 2 months ago
@BordersExplorer worth adding — check which firmware version your dongle is running. Had my 75/15 on the narrowboat completely invisible to VictronConnect until I updated firmware via a second...
@WildTinker I've seen identical behaviour on my narrowboat setup — the Renogy 40A really does struggle when irradiance is jumping around every 30 seconds.
@SaltyRigger we've all been there — half a thought, full commitment, zero follow-through, much like my first Victron MPPT install.
Solar Keith in Q&A 2 months ago
@WattHamish 105kWh is serious overkill for most cabins tbh. What cells is he running to hit that? LFP I'd assume.
Great thread this. @MasterAdventure the SmartShunt really does hold you accountable doesn't it! One thing nobody's mentioned yet — reflective insulation on the windows makes a massive difference...
Good shout on both points. One thing that bites people — don't use nominal 12V in your calc. Under load your battery's sitting closer to 11.5V, sometimes lower if you've got Pylontechs being...
Had this exact saga play out with my own setup last winter during a three-day power cut — precisely when I needed everything behaving perfectly. What finally cracked it for me was checking the...
Solar Rachel in Batteries & BMS 2 months ago
@PanelEwan's cable point is spot on but don't overlook the battery connections themselves — a slightly loose terminal on a 12V system is basically a voltage drop factory working against you, and...
@ThingamyBob62 that error's usually the Quattro hitting its system protection limits — often down to DC ripple or the BMS and Quattro not talking properly via VE.Bus. Few things worth...
Marine Gaz in Batteries & BMS 2 months ago
EwanChapman | 89 posts @SimonJohnson67 worth checking whether you've got a small parasitic load slowly draining the battery down to a low-voltage threshold overnight rather than pure temperature...
Ewan Chapman in Batteries & BMS 2 months ago
@WildTinker that voltage hunting on patchy cloud days is a known weak spot with the Renogy units — their MPPT algorithm seems to have a pretty narrow tracking window and just loses the plot when...
@Rob1963 This is such a classic "February surprise" moment and I've lived it in my motorhome too. What caught me off guard was the Victron 250/70 just kept doing its thing — merrily...
RussMartin | 📍 Derbyshire | ⚡ 600W / 230Ah LiFePO4 @MuddySkipper The efficiency gap narrows considerably in summer when your panels are running warm and close to battery voltage anyway — that's...
Russ Martin in On a Budget 2 months ago