Multiplus II 48/3000/35-50 in North America grid connected system

Saw some chat about split-phase 240v setups in North America using a pair of Multiplus IIs and it got me thinking about our own grid-tie situation here in the UK.

Running a single Multiplus II 48/3000/35-50 myself at the moment — grid connected, modest loads, nothing mental. Works a treat for what I need. But curious whether anyone's gone down the route of stacking two units for UK domestic use, even if we don't have the split-phase faff to deal with.

The Americans are pairing them to get 240v split-phase across two legs. We obviously don't have that headache, but there's still a case for stacking if you want more output capacity or redundancy, right?

A few things I'm mulling over:

• Is it worth the complexity vs just stepping up to a larger single unit?
• Anyone running parallel Victron units on a UK grid-tie setup with a G98/G99 DNO notification done properly?
• Battery bank sizing — currently on a Fogstar 48v 200Ah LiFePO4, which copes fine for my place but parallel inverters would chew through that faster

Feels like the Victron ecosystem handles the configuration well enough through VE.Configure, but I'd rather hear from someone who's actually done it rather than just trusting the manual.

Anyone here running stacked Multiplus IIs on a UK setup? What's your experience been like — worth it or overkill for a modest home?

@JimKelly interesting thread — though worth flagging that the North American split-phase setup is quite different to what we're working with here. Their 120/240V split-phase isn't the same as our single-phase 230V, so I'd be cautious about applying those configs directly.

On the Multiplus II 48/3000 specifically — are you running yours in ESS mode or purely as an inverter/charger? I've been weighing up whether to add one to my narrowboat setup as emergency backup when on shore power, and I'm not sure whether ESS is even relevant outside of a fixed property connected to the DNO.

Also, has anyone had experience getting G98/G99 approval sorted for a Multiplus II in a UK residential setup? That bit always seems to trip people up.

Yeah the North American stuff is a different world tbh. Single phase 230v here makes life simpler at least.

Running a Multiplus II 48/3000 in my shepherd's hut — no grid connection obviously, but the Victron ecosystem is solid regardless. What's your current ESS config looking like @JimKelly?

One thing worth checking if you're grid-tied is your DNO's G98/G99 requirements. Victron are pretty good with compliance there but paperwork can be a headache depending on your network operator.

@FormerMechanic15 single phase 230V and a shepherd's hut means my Multiplus II setup has the footprint of a wardrobe and the complexity of a PostIt note compared to those poor North American lads bolting two units together just to run a tumble dryer.

@SilverHiker haha a wardrobe-sized setup in a shepherd's hut sounds like a nightmare for space.

I run mine in a garden office and even there the Multiplus II 48/3000 takes up more wall than I'd like. Worth thinking about cable runs too — my DC cabling from the Fogstar lithium bank had to be kept seriously short to avoid voltage drop issues. Spent ages getting that right.

On the original point about North American comparisons — the single phase 230V setup here really does simplify the inverter config side of things. My Victron installer said the ESS assistant setup is fairly straightforward once you've got your grid codes sorted for G98/G99 compliance. That bit caused me more headaches than the wiring tbh.

Anyone else had to go through a DNO application for grid export? Mine took about six weeks.