MutliSolar RS6000 Phasenübergreifendes Laden

Has anyone successfully got cross-phase charging working with a MultiSolar RS setup in a UK context?

I'm running a fairly modest system in my shepherd's hut — Victron MultiSolar RS 6000 on single phase (L1), paired with a Cerbo GX and a VM-3P75CT energy meter. The meter's picking up all three phases fine, but I'm struggling to get the RS to properly account for loads on L2 and L3 when calculating how much surplus to push into the batteries.

Background: the hut itself only draws from L1, but the supply coming in is three-phase from a nearby outbuilding. I'd like the system to see the total grid draw across all phases and offset accordingly, rather than just reacting to L1 in isolation.

Firmware-wise I'm on 1.31 for the MultiSolar RS and 1.06 on the energy meter. Cerbo is up to date as of last week.

A few specific questions:

• Is cross-phase compensation actually supported on the RS series, or is that a Multi/Quattro-only feature?
• Do I need to configure anything specific in VRM or is it purely a Venus OS setting?
• Anyone had issues with the VM-3P75CT reporting correctly when the RS is only connected to one phase?

I had a look through the Victron community forums but a lot of the discussion seems to be in German and focused on grid-tied setups, which isn't quite my situation. Would really appreciate hearing from anyone who's got something similar dialled in.

@DodgyHermit the thread title's in German which is throwing me slightly — are you working from a translated manual? Worth grabbing the English firmware release notes directly from Victron's site, as some localisation oddities creep in.

That said, cross-phase is largely a non-issue on a shepherd's hut single-phase setup. The RS 6000 is genuinely designed around single-phase UK installs — it's not a three-phase unit pretending otherwise.

What's your actual symptom? Because I ran mine for three months thinking the charge profile was wrong, turned out to be a VE.Configure parameter I'd misread after using a German-language walkthrough someone posted on a Dutch forum.

The specific setting to check: ESS > AC Input Current Limit — easy to get confused with grid-assist thresholds if you're working from translated documentation.

What does your VRM dashboard show during the charging cycle?

@DodgyHermit yeah the German thread title is a red flag — you're almost certainly working from a machine-translated manual or a continental forum post that doesn't map cleanly to UK single-phase setups.

Cross-phase charging isn't really a concept that applies here the way it does in 3-phase European domestic installs. The RS 6000 can do 3-phase but you'd need three units configured as a stack.

What's your actual problem though? Are you seeing something weird in VRM or is this purely theoretical? Because "fairly modest shepherd's hut" and "RS 6000" is already an interesting combination — that's a serious bit of kit for a hut 😄

Worth posting your VRM screenshot and your battery config. Also which firmware are you on — some of the older RS firmware had genuinely baffling behaviour that got quietly fixed.

@DodgyHermit the MultiSolar RS is a single-phase inverter-charger — there's no cross-phase (phasenübergreifend) functionality in the product at all. That's a three-phase concept that simply doesn't apply here.

Sounds like you've got a German forum thread mixed up with your setup, probably from a multi-unit three-phase ESS installation.

For a shepherd's hut on single-phase you don't need any of that. Just configure your charge sources correctly in VictronConnect — solar priority, then grid/generator assist if you have it. That's it.

Worth downloading the English manual direct from Victron's website rather than relying on whatever translated doc you're working from. The Victron RS documentation is actually pretty solid once you're reading the right version.

What's your battery setup? That might be more relevant to whatever issue you're actually trying to solve.

@Wez1961 has nailed it on the hardware side. I'd just add — I went down a very similar rabbit hole last winter with my narrowboat setup, spending a whole afternoon convinced I was missing something in VictronConnect, all because I'd been reading a translated German forum thread that didn't quite map onto the actual product I had in front of me.

The Victron documentation on victronenergy.com is genuinely excellent and available in proper English — worth going back to that as your baseline rather than any translated source. The RS 6000 product page and associated CCGX integration guides will tell you exactly what the unit can and can't do, no ambiguity.

What's your actual goal here? There might be a perfectly achievable solution once we know what you're trying to accomplish in the shepherd's hut.