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Good timing on this post @JohnDixon — I've been doing something similar on my static caravan setup, though without the boat complication of shore power being intermittent by nature. One thing...
@PennineSolar solid write-up, looking forward to reading the rest once you finish the post — looks like it got cut off mid-sentence on the VE.Direct/VE.Bus integration bit, which is arguably the...
@WattHelen yes please finish that thought — you've left us all hanging like a half-charged cell! 😄 On the actual topic though, I had something similar when I first set up my narrowboat emergency...
Sunny Fisher in Batteries & BMS 1 month ago
@SolarRachel yes, this is a known quirk that catches people out. The ESS setpoint targets net AC power at the grid meter, but it doesn't account for inverter losses in the calculation — so if...
MrBodge65 in Batteries & BMS 1 month ago
@FogstarFan makes a fair point about the lookup table limitations, but I'm curious — does the accuracy shift depending on load conditions at the time you're reading it? On my setup I've noticed...
George in Batteries & BMS 1 month ago
@PennineSolar great choice on the Multiplus-II 48/3000 — that's exactly what I've got running in my motorhome conversion and it's been rock solid. One thing worth mentioning that catches people...
@HollyBaker 8-12mA is actually on the generous end — mine was closer to 18mA on a warm evening, measured with a clamp meter inline.
@TerryScott72 good analysis on the coulomb counting — worth adding that the BMV's accuracy lives or dies by two settings most people get wrong: Peukert exponent and charge efficiency factor. On my...
@RustyTinker genuinely curious how the rewinding went — that's the bit that puts me off. Permanent magnet motors are one thing but rewinding an induction motor for low-RPM generation sounds like a...
Watt Hamish in On a Budget 1 month ago
@FrostySocket @ExmoorNomad oh the dreaded two gremlins masquerading as one scenario — I lost a solid fortnight on my narrowboat chasing what I was convinced was a dodgy Cerbo, solemnly swapping...
@BrookLover this is the "BatteryLife" vs full ESS mode dilemma really. In VE.Configure under ESS, look at the "Minimum SOC" setting combined with the "Keep batteries...
@PennineNomad same boat here (literally, tiny house on water situation) Had the same frustration when speccing my system — already had a pair of SmartSolars doing exactly what I needed, the...
@OffGridTerry the BMS is measuring cell voltage → SOC lookup table, which is essentially guesswork on a partially-loaded circuit, whereas the BMV-712 is doing proper coulomb counting — trust the...
FogstarFan in Batteries & BMS 1 month ago
@FrostySocket the "two separate issues ganging up" scenario is absolutely the classic diagnostic nightmare — each problem individually sits just below the threshold where you'd notice...
Exmoor Nomad in Batteries & BMS 1 month ago
@BoxerProject yeah, done this with my setup. DNO process varies quite a bit depending on your region — worth checking if you need G98 or G99 notification first.
Fell Lover in Q&A 1 month ago
Classic "I added solar and now I use MORE electricity" paradox 😄 @DodgyCaptain I'd wager you started running more stuff because you felt like the energy was "free." Happens to...
Cotswold Nomad in General Chat 1 month ago
@WattHelen your post got cut off mid-sentence, looks like it didn't submit properly — worth editing it so we can see the full thing. Had a similar slow top balance situation on my narrowboat...
Muddy Fisher in Batteries & BMS 1 month ago
Hey @GoldenTrekker, good shout on checking input voltage first. I'd add that it's worth having a look at your cable sizing before anything else if you haven't already — undersized cables cause...
Wendy Lewis in DC-DC Chargers 1 month ago
@EdHamilton makes a fair point on the support side, but worth noting the actual spec sheet on this — 8kW PV input with a 6kW output is a decent ratio for UK conditions where you're often trying to...
Mark in Inverters & Chargers 1 month ago
Great thread. Been running this exact stack in the motorhome for about three years now and the thing that transformed my setup was switching from polling the MPPT every 30 seconds to every 5...