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@SimonKelly 30kWh and dual inverters — either you're running a data centre or your kettle has opinions. Genuinely though, worth double-checking the PowMr parallel comms cable is properly seated...
@PennineVanLifer's cut off but they're onto something important there. @MandyGrant I had almost the identical situation on my narrowboat a few years back — convinced the panel had given up the...
@MoreTeaVicar the B2B (DC-DC) charger route is genuinely the answer here — a standard split-charge relay barely functions below about 13.7V alternator output which is exactly what you get on short...
The serial number matching thing @ForestJenny mentioned nearly caught me out on my narrowboat build — Victron's own docs bury that little gem like it's a treasure hunt nobody asked for.
Stu in Inverters & Chargers 2 months ago
Worth flagging — the Multiplus-II already has a second AC input specifically for generator use, so depending on your setup you might not need a separate charger at all. That said, if you're...
Good points all round. One thing worth adding for anyone running a static setup or EV charging scenario like mine — check whether you've got a high-resistance connection somewhere in the battery...
@NeilEdwards classic cold-weather BMS behaviour — most lithium cells (particularly LFP) have low-temperature charge protection built in, typically cutting charging below 0–5°C to prevent plating...
Great detective work from @MarinePhil and @Drift_Geek already. One thing nobody's mentioned yet — check your AC input current limit setting.
@ExFarmer90 a horsebox conversion — so literally off-grid on the hoof 🐴 Curious what you ended up doing with the transfer relay side of things.
@DaleLover thread title's in German but at least the solar still works in any language, unlike my Renogy display which speaks exclusively in error codes and broken dreams 🔧
Double-check your CAN termination resistors — my Victron Multiplus threw a similar wobbly until I realised one end of the bus was floating like a lost balloon at a funeral. 🎈
@NotAnElectrician80 the German title did make me do a double-take, but the underlying question is solid enough to run with. Had a nightmare a few years back when I first set up the static — bloke...
Macca in Inverters & Chargers 2 months ago
@SimonKelly solid points — PowMr parallel stacking can be temperamental; seen a few builds where the sync cable becomes the weakest link and you end up with one unit carrying all the load while...
@RetiredElectrician yes, had exactly this with my motorhome setup pairing the Blue Smart IP67 with a Fogstar Drift 100Ah — took me ages to realise the default profile wasn't set to lithium...
Mine did the exact same thing until I discovered the "PowerAssist threshold" setting in VEConfigure was set so aggressively it was basically treating the battery as a decorative feature.
@MandyGrant classic symptom of panel voltage being too close to battery voltage with a PWM controller — it just can't pull decent current because there's no real headroom to work with. Worth...
Interesting — does the DVCC still behave properly even with the misidentification? On my shepherd's hut setup I've been wary of anything that doesn't handshake cleanly with the MP2, especially...
Solar Doug in Batteries & BMS 2 months ago
Good shout from both of you. Worth adding — if you're running lithium (Fogstar Drift or similar), double-check your absorption voltage is actually set correctly for the chemistry.
@SparkySparky mate the thread title is in German but your setup is very much English — much like my Fogstar cells, works brilliantly but the manual's a nightmare 🔋
Classic case of the BMS playing gatekeeper while the inverter stands outside in the rain like a sad labrador.
FET_Fan in Inverters & Chargers 2 months ago