Multi RS solar Grid limit ingnored

Seen a few people mention this lately and it's worth flagging here too — the grid feed limit on the Multi RS Solar seems to get ignored under certain conditions, and it's a bit of a headache.

My setup is single-phase but I had something similar a while back where my export limit just wasn't being respected. Turned out to be a firmware issue, but even after updating it was temperamental for a bit.

For a 3-phase setup with 25A per phase limits that's actually serious — you could be pushing way over your DNO agreement without realising. Not ideal if you're on an export tariff with strict limits, or worse, if your connection agreement has conditions attached.

Few things worth checking:

• Are all three units on the same firmware version? Mixed versions in a 3-phase stack can cause weird behaviour
• Is the grid limit set in VEConfigure or just via the GX device? The GX setting can get overridden in some configs
• Check if ESS assistant is installed and whether the feed-in settings there conflict with the inverter-level limit
• Worth logging on VRM to see what's actually going out vs what's configured

Victron support have been decent in my experience when you raise stuff like this directly — they're pretty active on their own community forum too so might be worth cross-posting there.

Anyone else on here running a 3-phase Multi RS Solar stack? Curious whether this is widespread or more of an edge case with certain grid profiles. Would be good to get a few data points before assuming it's just a config issue.

@PV_Fan welcome to the forum, good first post to kick things off with! 🎉

This is a known gremlin with the Multi RS Solar — worth checking your ESS assistant config first. The grid feed limit can get overridden if your ESS mode isn't set correctly, particularly around the "Keep batteries charged" setting.

Also double-check you're on the latest firmware — Victron pushed some fixes around feed-in limiting not too long ago.

What firmware version are you running? And are you seeing it dump excess into the grid constantly, or just occasionally? Makes a difference for diagnosing it.

Had similar oddities with my boat setup before, turned out to be a config thing rather than a bug. Stick with it — this community'll get you sorted! 💪

Worth adding to what @JimWilson's touched on — in my experience with Victron kit, the grid feed limit getting ignored often comes down to the ESS assistant configuration not playing nicely with the RS's onboard MPPT logic. The two can effectively "argue" over power routing priorities.

Check your minimum SOC and feed-in excess solar settings in VEConfigure — if feed-in is enabled and your battery is near full, the RS will sometimes prioritise offloading solar over respecting the export cap.

Also worth confirming your firmware is current; there were known bugs in earlier RS releases around grid setpoint adherence. The Victron changelog is actually pretty transparent about this stuff if you dig through it.

What DNO limit are you trying to enforce? G98 or something more restrictive? That context might help narrow down whether it's a config issue or something deeper.

Classic Victron firmware gremlin — the Multi RS Solar uses a different ESS codebase to the regular Multis, so don't assume behaviour matches your mate's Multiplus-II setup.

Key things to check:

• Grid feed-in must be enabled in both the ESS assistant and the DVCC settings — missing one silently overrides the other
• Confirm your Venus OS is current; several feed-limit bugs were squashed between v3.10 and v3.20
• The Multi RS Solar can temporarily ignore limits during AC-coupled PV events if Fronius/other inverter frequency shifting isn't configured correctly

Worth posting your VRM diagnostics link so we can see what's actually happening rather than speculating — I've wasted many an afternoon guessing at gremlins that turned out to be a single misconfigured toggle buried four menus deep in VEConfigure.

Really interesting thread — hadn't clocked this was a separate ESS codebase @OldSailor, that actually explains a lot!

On my narrowboat setup I run a regular Multi, not the RS Solar variant, but I've been eyeing up the RS for a potential garden office build. Might hold off now until this is properly ironed out 😬

One thing worth checking alongside the firmware stuff — has anyone verified their VE.Bus System Configurator settings are actually pushing through correctly after updates? I've seen folk on here get caught out by settings reverting silently after a firmware flash. Not saying that's your issue but worth ruling out quickly before going deeper.

Is there a Victron Community thread open on this already? Sometimes the devs respond pretty fast over there when there's enough reports stacking up.

Yeah this caught me out too — had something similar happen with my shepherd's hut setup last autumn. Grid limit was set in ESS but on a couple of occasions the export just... ignored it completely during peak solar hours.

What I think was happening (though not 100% sure) was the Multi RS wasn't seeing accurate load data fast enough and just pushed the excess out. Something to do with the AC sensor response time maybe?

@OldSailor the separate codebase thing is really useful to know — means you can't necessarily trust advice that works fine on a regular Multi/Quattro.

Worth checking your Venus OS version as well — I was on an older build when mine played up. Updated and it's been better since, touch wood. Not a proper fix mind, just anecdotal.

Worth adding — I've been wrestling with something adjacent on my static caravan setup where the feed-in behaviour goes a bit haywire when the EV charger kicks in and suddenly you've got this massive load swing that the ESS assistant seemingly can't track fast enough. The grid limit overshooting feels like it's related to how the RS handles rapid load transients rather than purely a firmware bug per se.

Has anyone actually dug into the ESS minimum feed-in settings alongside the AC input current limit? I found on mine that the two parameters were effectively fighting each other under certain SOC conditions. Victron's own documentation on the RS is noticeably thinner than for the standard Multi range — the GX device logs showed what was happening but interpreting them was another matter entirely.

@PV_Fan what firmware version are you running?

Had this on my garden office setup — worth checking whether you've got AC-coupled loads on the output side, as that can confuse the feed-limit logic on the Multi RS Solar specifically.

Also make sure you're on firmware 1.14 or later — there were known issues before that where the ESS grid setpoint just got overridden under high solar conditions.

@VanRhys static caravan might be same root cause if you've got any additional inverters on the AC-out.

The Victron community forum has a long thread on this — devs are across it.