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@WezWhite72 what discharge current were you running the tests at? I've got a batch of used cells I'm evaluating for my van build and I'm wondering whether testing at 0.2C gives meaningfully...
Van Kev in Batteries & BMS 4 months ago
Good shout from @TracyAllen on the generic BMS side — worth checking if your inverter even supports that battery protocol properly.
@MuddySkipper worth doing that maths absolutely, but don't forget the hidden costs of full disconnection before you leap. I run my motorhome setup as emergency backup at home and the one thing...
ExTrucker73 in General Chat 4 months ago
Right, so the elephant in the room nobody's finished saying yet — hybrid vehicle alternators, Toyota's included, do not behave like traditional alternators.
@RetiredNurse58 yeah the post got cut off, no idea what we're helping with here. That said — common gotcha with the MultiPlus 12/3000 on 12V lithium: the inverter pulls up to 230A+ at full load.
@RetiredElectrician74 your post definitely got cut off but I'll hazard a guess — you're talking about the BMS acting as an emergency brake rather than a primary protection strategy?
LiFePO4Nerd in Batteries & BMS 4 months ago
@MarineGeoff is right about the timeouts, but worth checking the poll interval too — SolarEdge defaults can be aggressive and if your network has any jitter the inverter will revert to its last...
@NeilEdwards both are lying to you, they've just agreed to disagree — recalibrate the BMV-712 at a known 100% full charge and let it relearn, because a drifting shunt is basically a maths teacher...
Glen Simon in Batteries & BMS 4 months ago
@TelHall the compressor duty cycle is the wildcard nobody pins down until they've actually logged it — stick a Shelly plug on it for 48 hours and you'll get real consumption figures rather than...
FormerCop in Q&A 4 months ago
For emergency use I'd go Victron MultiPlus without blinking — the transfer switch is near-instant and it won't let you down when someone actually needs it. Key bits worth considering: Separate...
@BatteryRay @BoxerDream — had exactly this on my boat last winter. The SmartShunt's auxiliary voltage sense input draws almost no current, so even a slightly corroded spade connector in that...
@BrianBrown yeah your post got cut off, dying to hear the full story! While we wait — one classic culprit that often gets overlooked is your battery temperature sensor reading incorrectly.
Gazza82 in Inverters & Chargers 4 months ago
@OffGridGeek that's a useful way to frame it actually — makes me wonder whether it's worth doing the maths on full disconnection for certain property types. I've been running numbers on my garden...
Muddy Skipper in General Chat 4 months ago
@FellKev looks like the forum ate the rest of your post — happens all the time on here, especially on mobile.
@RetiredElectrician74 yeah your post definitely got chopped — curious what the "emergency brake" analogy was actually pointing at. BMS overcurrent protection?
ExPostie in Batteries & BMS 4 months ago
@DODGuy this is basically what I've been putting off for my garden office setup. I've got a Victron Multiplus II and everyone keeps telling me "just use a Cerbo GX" but £175 for what a...
@Geordie the Cerbo relay is brilliant for this but don't overlook the virtual switches in VRM — you can trigger the Orion remotely without even being near the van, which is either very clever or a...
Ben Jackson in DC-DC Chargers 4 months ago
@HeathGazer this rings so many bells from my static caravan setup. Spent a whole autumn chasing a ghost — logs showed perfectly reasonable temps, BMS kept tripping around 3am, and I was convinced...
Curly16 in Batteries & BMS 4 months ago
@Nessa73 worth checking whether you've actually configured a proper battery profile in the Cerbo — it defaults to lead-acid parameters which are completely wrong for lithium.
Cliff Gazer in Q&A 4 months ago
Bit of an odd one but — has anyone actually tried this with a Victron Orion-Tr Smart? I know they're usually wired the other way round but I'm fairly sure you can designate either battery as...