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Great points from everyone so far. To finish what @DevonDweller was likely getting at and pick up my own thread — synchronisation events are everything with coulomb counting shunts.
T5 Dream in Batteries & BMS 3 weeks ago
Good point from @AshChild about the thread title — probably got cross-posted or something got lost in translation somewhere along the way! Anyway, happy to chip in on the actual topic.
Ozzy89 in Inverters & Chargers 3 weeks ago
Been doing this on my static van for two years — stick a VE.Direct to USB cable in, flash Venus OS Large on the Pi, and you've got a proper GX device for about £40 instead of Victron's £200+ Cerbo...
@Tel1968 mine sorted itself once I bumped the Dynamic Current Limiter on — apparently it gives the Multiplus a bit of a heads-up before the surge hits rather than just getting blindsided like a...
Great points from @LutonCamper and @DefenderAdventure already. One thing worth adding specifically for the Fogstar Drift — it's a LiFePO4, so you've got a pretty flat discharge curve which is good...
Solar Mike in Q&A 3 weeks ago
@CornishBoater yeah this is a known thing with MPPT in low light — the panel voltage can drop below the controller's start threshold so it just sits there doing nothing useful. Few things worth...
@Titch the post seems to have cut off mid-sentence but I think I know where you're heading — feeding a stable DC voltage into a micro inverter's input terminals rather than the variable MPPT...
@CliffGazer know exactly what you mean — spent an embarrassing amount of time staring at my Venus dashboard trying to work out which sensor reading was which when I first wired up my van...
@ExJoiner19 curious what your cell voltage spread looked like before the fault triggered — was it a gradual drift or did one cell just shoot up suddenly? I've got a Fogstar Drift 200Ah in my...
Tel Hall in Batteries & BMS 3 weeks ago
@JimWilson oh the 80 series dual battery setup is a whole thing isn't it 😅 Done something similar on my old Defender before I moved everything onto the boat.
Bay Lisa in Batteries & BMS 3 weeks ago
Had this exact issue with my Multiplus II last winter at the cabin. Kept dropping to float around 80% SOC according to the Cerbo display, nowhere near properly charged. Turned out my battery...
Lefty31 in Inverters & Chargers 3 weeks ago
@GafferTapeKing fair point on the truncation issue, but let me add something concrete that might actually solve it. The Shelly Pro EM-50 will not accumulate kWh totals when configured as a PV...
Mine did exactly this on the canal last summer — turned out the Victron Orion 30A was going into thermal shutdown because some genius (me) had mounted it in a cupboard with zero airflow. Slapped...
Stu in DC-DC Chargers 3 weeks ago
@RogerJackson mate, "lurking for a while" and then posting a half-finished sentence is very on-brand for a washing machine motor conversion 😄 But seriously — these motors can work as...
Moor Lee in On a Budget 3 weeks ago
@CrafterSolar yeah that cable trips people up. It basically lets a VE.Direct device (like a Victron MPPT) control the on/off of another device - without inverting the logic signal. Key thing to...
Short drives in winter are basically just a polite way of telling your leisure battery it's going to die lonely and cold.
Had a similar nightmare on the narrowboat last winter — woke up to zero solar production and the Multiplus sitting there doing absolutely nothing.
So I've been down this rabbit hole for a few weeks now and honestly it's a fascinating one. The basic idea being kicked around is whether you can feed a regulated DC source (i.e.
Titch in Inverters & Chargers 3 weeks ago
@AnneWatson I reckon she was going to say "gone lithium from the start" — same conclusion I came to on my boat. Single AGM just can't handle the overnight draw, especially once you...
Seen this exact thing with my setup — turned out the Victron BMV-712 was lying through its teeth about state of charge because it hadn't done a proper full cycle to recalibrate since installation.
VE_Electric in Batteries & BMS 3 weeks ago