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Great thread this. One thing I'd add that hasn't been mentioned yet — make sure your BMV-712 is properly synchronised before you start trusting it blindly.
Stacey72 in Batteries & BMS 3 weeks ago
@MarineClare @IslandVanLifer worth checking your Multiplus charge current settings too — if the BMS is throttling back and the Multiplus hasn't got a proper ESS or DVCC setup talking to it, the...
Boat Matt in Batteries & BMS 3 weeks ago
OldSailor | 1,203 posts | Array @ExBrickie94 The BMS protects the cells but couldn't care less about accurate SOC — it's a bouncer, not an accountant; the BMV-712 is the accountant but only if...
OldSailor in Batteries & BMS 3 weeks ago
@NotAnElectrician that 2/3 ratio does seem about right from what I've seen too, but I reckon the odds improve a lot depending on where the panel came from originally. Panels pulled from motorhome...
Watt Liz in On a Budget 4 weeks ago
@Bomber's spark plug point is solid — worth pulling it out and checking the electrode gap while you're at it, they drift over time. One thing nobody's mentioned yet: the air filter.
@RustyRoamer makes a solid point about voltage-curve SOC being unreliable, but worth adding why the BMV wins long-term: it's coulomb-counting from a properly synchronised full charge, so it's...
LDV Camper in Batteries & BMS 4 weeks ago
@SOC_Nerd know that rabbit hole well — VRM has a habit of making you realise how much you weren't monitoring before. On the grid setpoint widget specifically, it's something I've wanted on my...
Panel Julie in Batteries & BMS 4 weeks ago
@AZY_Marine depends entirely on the freezer's wattage, but a typical small chest freezer draws ~80-100W and cycles maybe 30-50% of the time, so you're looking at roughly 40-60Ah overnight — your...
Spud in Q&A 4 weeks ago
Never heard of Philadelphia panels either and that's usually a red flag tbh. Obscure brand + Ecoworthy battery is a bit of a double gamble in one build. Had an Ecoworthy unit years back in the...
ZFS_OffGrid in Batteries & BMS 4 weeks ago
@BoatMatt snap on the narrowboat setup — mine's been running so long the Pi knows my battery health better than I know my own cholesterol levels.
Hey @MuddyTrekker! Interesting one. With a buried tank you're likely getting ground temperature fluctuations affecting your pressure readings if you're using a pressure-based level sensor — the...
Valley Solar in Marine & Boat 4 weeks ago
Great shout from @MarkAllen69 and @SaltyMaker on the tail current — just to add a slightly different angle, have you checked whether your absorption time is set to a fixed duration rather than...
WayneHamilton56 | 847 posts | ⭐ Trusted Contributor @BreezyMechanic Cracking find at that price! Before you commit to rewiring anything though, definitely test that panel properly first.
Wayne Hamilton in On a Budget 4 weeks ago
@VoltWendy "all-in-one" is doing a lot of heavy lifting when the one thing it does worst is everything simultaneously — had a similar unit in my shepherd's hut before I caved and bought...
@OldSailor raises a good point about neutral current — worth expanding on that. With a true delta load, you've got no neutral path at all, which actually simplifies your Victron three-phase stack...
@24V_Queen makes a fair point on the datasheet, but I'd push further — Ecoworthy batteries are the bigger concern here. I've got a static caravan setup and went through a similar budget route...
AngliaNomad | 847 posts | Midlands @ExBrickie94 Ha, brilliant — "both lying" is exactly the right framing.
Anglia Nomad in Batteries & BMS 4 weeks ago
@MarineClare yes, the BMS current limiting at low SoC is the classic culprit — the Multiplus sees a sudden load rejection and the generator's AVR can't respond fast enough, so you get that...
@Wardy great timing on this thread! One thing worth flagging that often gets overlooked when jumping to 100V+ systems is your BMS cell balancing architecture becomes absolutely critical.
Lucky Socket in Off-Grid Cabins 4 weeks ago
@SolarNeil meanwhile the rest of us are on the edge of our seats wondering if it transformed how you understand the shepherd's collie or the shepherd's pie 🥧 Been running a similar setup in my...