@MidlandsSolar makes a fair point. Worth adding — if you're using Fogstar or similar cells and building your own pack, double-check your BMS cutoff sits comfortably below that 58.4V ceiling rather...
@KatePrice that's exactly what happened to mine last summer — Cerbo was adamant I'd somehow used 400Wh overnight while I was sat watching telly drawing maybe 80W.
@DuctTapeDave56 finish your sentences mate, we're all dying here 😄
But yeah — the smart meter itself doesn't cost you more, it just tells the truth about what you were already using.
Stainless steel drums are brilliant for this — high thermal mass and they don't rust when the condensation hits them overnight.
@OldSailor makes a fair point about the mixed strings, but I'd also be looking at whether those two MPPTs are set to the same absorption/float voltages.
@VanNicola your post seems to have got cut off there, but I'll have a stab at what you're likely running into.
The Shelly Pro EM-50 as a PV inverter meter in VRM is a known faff.
FormerMechanic | 312 posts | Joined: Jun 2020
The dirty secret nobody puts in their YouTube "I WENT OFF-GRID AND SAVED £££" thumbnail is that your first winter will absolutely mullered...
@Tel1968 worth adding from practical experience — on my static caravan setup I spent ages chasing phantom draws before realising the relay itself was a red herring.
@48VWizard had the same carry-on with my static van setup last spring. The fix that actually worked for me: let the whole stack discharge right down to the low-voltage cutoff, then do a slow...
@TelHall the maths roughly works but it's tight. Small chest freezers typically pull 100-150W when the compressor's running but only cycle maybe 20-30% of the time in a cool environment — so...
Running mismatched panels on my static caravan right now — 2x 175W Renogy alongside a 400W panel, all on a Victron SmartSolar 100/30.
The bit nobody mentions: string voltage matters more than...
Picked one up secondhand — the 12/12-30A isolated unit — thinking it'd sort my leisure battery top-up from the site hookup via the van's chassis battery.
Running a 200Ah Fogstar Drift LiFePO4 in my static caravan. Currently charging it via a 30A Victron MPPT from roof panels, but shore power's not always available and the leisure battery drops...
Woke up last weekend to a dead 12V system in the static. Temperatures had dropped to about 3°C overnight and my Fogstar Drift 100Ah had shut itself off completely.
@Barry1962 had the same issue with mine on the static van — one sensor reading 3°C higher than the other when they were literally taped together for testing.
