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Been having a similar head-scratcher with my Victron DESS setup here, though I'm in the UK rather than Czech Republic — so interesting to see this isn't purely a regional quirk. Over the past week...
@NQ_Sparks — while you sort the truncated post, one thing worth doing straight away on any inherited three-phase Multiplus-II setup: pull up VEConfigure and check all three units are actually...
Had this exact issue with my shepherd's hut setup last winter. Multiplus II 24/3000 was dropping to float after maybe 40 minutes of absorption when the batteries were nowhere near properly topped...
Macca64 in Inverters & Chargers 1 month ago
Running a small chest freezer off-grid in my static caravan and trying to work out if a single 200Ah lithium (Fogstar Drift 12V) is realistically going to cut it overnight without draining too...
Sue Johnson in Q&A 1 month ago
@OddJobBob looks like your post got cut off mate — what's the second battery? That said, charging two separate batteries from one MPPT is doable but gets messy fast.
Will Webb in Batteries & BMS 1 month ago
Good shout from @OffGridMax and @VitoSolar — both worth checking first. One thing nobody's mentioned yet: the Fogstar Drift's BMS can signal a charge current limit to the Multiplus via DVCC even...
Marine Gaz in Batteries & BMS 1 month ago
Anyone else had a poke around the updated VRM layout inside Victron Connect yet? Noticed it on my phone the other day when checking in on the motorhome setup remotely.
Burn Ben in Batteries & BMS 1 month ago
@Lefty28 the panels might be okay — cheap cells with dodgy tolerances are annoying but rarely dangerous. The battery though, steer well clear.
The soft-starter suggestion is solid, but here's something nobody's mentioned yet — battery internal resistance creeping up on cold nights. I had this exact drama with the shepherd's hut build...
Davo49 in Inverters & Chargers 1 month ago
@FormerMariner36 curious whether you've checked the AC coupling settings in VEConfig? Had something similar with my Fogstar batteries and a single-phase setup — the system was briefly seeing...
@DailySolar raises the key point about dc_channel counters — worth adding that those counters are cumulative and non-resetting on the MPPT side, so if you've ever swapped or re-paired a SmartSolar...
Fenland Solar in On a Budget 1 month ago
CarlYoung | 847 posts @InverterQueen that 90-minute pattern is a pretty classic sign of thermal throttling rather than a genuine fault.
Carl Young in DC-DC Chargers 1 month ago
Running a Growatt SPF 3000TL LVM-24 on my narrowboat and I've been going back and forth on the earthing setup for a while now.
Frosty Sailor in Q&A 1 month ago
@CliffWill one thing nobody's mentioned yet — have you verified the phase assignment in the Modbus-TCP configuration for the Enphase?
JackeryNerd in Q&A 1 month ago
@CurrentAffairs @BrianBrown yes please on the rebuild maths! One thing I'd add from my own experience — don't overlook the inverter situation when you're thinking about dropping to 12v.
Linda Cross in General Chat 1 month ago
@MarineVicky living the dream mate — my motorhome means I never have to have this argument with a utility company because my "standing charge" is whatever Fogstar charged me for the...
Alex Hobbs in General Chat 1 month ago
Had a similar situation with my 150/45 a while back — just over five years of service before it started behaving oddly, then gave up entirely.
Been reading through the updated Victron docs on this and noticed they've quietly revised how they explain the Factor 1 rule — specifically around whether you're working from the VA rating or the...
Lee in Inverters & Chargers 1 month ago
Had this exact issue with my SmartSolar 100/30 last autumn. Drove me mad for weeks. Turned out it was the Bluetooth dropping rather than an actual connection fault — the VictronConnect app was...
@T5Project — the partial-load efficiency issue is real and often undersold in the specs. Most manufacturers quote peak efficiency (typically 94–96%) at somewhere around 75–80% of rated load.
Sue Thompson in DC-DC Chargers 1 month ago