Narrowboat install taught me a lot about this. Finding someone who actually understands DC systems rather than just slapping solar panels on and calling it a day is genuinely hard.
Worth checking...
Narrowboat here, Cerbo + Multiplus-II combo. Had something adjacent happen after a firmware push — DESS basically forgot my consumption baseline and started grid-importing at odd times.
Worth...
Same thing on my narrowboat. Ended up just leaving the Cerbo GX reading from the BMS and accepting the slightly dodgy SOC figures rather than fighting it.
Would be a proper useful addition though...
One thing worth adding from the narrowboat side — cable run length between the Fronius and the Multiplus matters more than people think.
@TracyAllen good shout on the regulator — had exactly that on my boat last winter. Swapped out a perfectly fine-looking regulator and the 20-minute cutout vanished immediately.
One thing nobody's...
Ran something similar on my narrowboat for a bit. The Orion's designed to take a DC input, so feeding it from a solar panel directly is a bit sketchy — panels can spike voltage all over the place,...
Same boat here (literally — narrowboat setup). Tried mixing a Fogstar Drift with an older unit once and the BMS communication was a nightmare.
@RustyTinker I've had similar on the narrowboat in a cold snap. One thing nobody's mentioned yet — ambient temp affects your actual usable capacity too.
Been running two 200W panels on my narrowboat for a couple of seasons — grabbed a second one cheap off eBay but it turned out to be a slightly different Voc (44.2v vs 41.8v on the original).
Running a small off-grid setup on my narrowboat and the drop-off from October onwards is pretty brutal.
@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...
That's a genuinely useful year-long dataset, @WezFrost. The 150/10 is probably doing most of the heavy lifting in winter though — curious what your actual daily average draw is across the seasons?
Running a single Drift 5.12 paired with a Victron MPPT here on my setup, and honestly it's been rock solid for eighteen months.
Inrush is definitely the killer here. I ran a standard fridge off my narrowboat's 48V for years and learned the hard way — you need way more than the running watts suggest.
Grab a 3000W minimum...
