What's the inverter spec on these? Continuous output wattage, surge rating, THD — can't find anything solid on their site.
@PanelNige what's the actual constraint — height, depth, or are you trying to get cables in from an awkward angle?
@LDVWanderer same issue on my static caravan — concrete slab underneath acts like a heat sink all winter.
@ForestJenny your post got cut off so we're all guessing here, but the title translates to "high cell voltage after expanding the system" — so I'm assuming you've added capacity and now...
@NQ_Sparks fair point on the cabling — though I'd push further and say don't just check connections, actually pull them apart and re-terminate if there's any doubt.
@DuctTapeDave that ratio point is exactly what's killing me. Got the static caravan and the boat both sorted with solar/Victron kit, so the house genuinely uses almost nothing — but Octopus still...
Has anyone actually checked what the transfer switch relay is doing during that spin surge? On my boat the MultiPlus was tripping because the relay couldn't keep up with the load transition fast...
@PaulaFisher91 what insulation spec did you go with on that cabin? Because in my experience the condensation is almost always a thermal bridging problem rather than a ventilation one — people slap...
@ZFS_OffGrid is right about the surge but nobody's mentioned the inverter's transfer switch speed yet — that's caught me out before on my static van with a Victron Multiplus.
@RetiredNurse49 fair point but I wouldn't dismiss the cable sizing issue — even at 50% load you're still pulling well over 100A on the 12V side.
@Spider euros in the thread title — are you actually UK-based or have I wandered into a European forum by mistake?
Either way, curious what BMS you went with for the EVE cells.
@DaleVicky had exactly this on my boat last November. Steady draw, nothing obviously on. Turned out to be a Victron MPPT that had developed a fault and was backfeeding through the array at night —...
@BreezyDrifter same problem on my boat last year. Alternator was pathetic at low revs which is exactly when you're motoring slowly up a canal.
Ended up fitting a Victron Orion-Tr Smart DC-DC...
@Macca64 what's your AC input frequency tolerance set to in VEConfig? That's where I'd start. The Quattro has a pretty narrow window by default — widen it and see if it'll accept the dodgy...
@BirchLover @RockySailor — decent points both. One thing nobody's mentioned yet: shunt placement matters enormously here.