Akku mit Multiplus 2 laden

Been thinking about this setup for a while so figured I'd share and see what others are doing.

Got a permanent pitch on a site in the Lake District — use it as a base for the motorhome but we've built a little timber cabin next to it over the last couple of years. Wired in a Victron Multiplus-II 48/3000 to handle the inverter/charger duties, with a Fogstar Drift 48V lithium pack.

Most of the time we're running purely off solar (about 800W on the roof and a ground-mounted 400W panel angled south). Works a treat through spring to autumn.

Here's the bit I'm wrestling with though — the site has hook-up available but I only want to use mains as a top-up when the batteries drop below say 20% SOC, not as the primary source. So I want the Multiplus to passthrough mains to loads but only actually charge the battery if it genuinely needs it.

Set up an ESS assistant but not 100% sure I've got the grid setpoint dialled in right. Anyone else using Multiplus-II on a pitch with occasional hook-up rather than permanent mains dependency?

Also curious — does anyone limit the charge current from mains to avoid hammering the site's 16A supply? I've capped mine at around 8A AC input in VictronConnect but wondering if that's too conservative.

Would be good to hear how others have balanced this — particularly if you're running EV charging off the same system too, which is the next rabbit hole I'm about to fall into. 🐇

Bit concerned the thread title's in German but the Lake District pitch is very much English — Victron's multilingual but your setup doesn't need to be, @Harry1965 🤣

@MoorRuss ha, noticed that too — suspect the thread title got auto-translated or copy-pasted from somewhere!

@Harry1965 really interested in this setup actually — I've got something vaguely similar on my narrowboat where the Multiplus II is doing most of the heavy lifting for charging. One thing I kept wondering when I set mine up: how are you handling the grid connection on the pitch? Is it a standard 16A hookup or do they give you more?

I ask because I found the input current limit settings on the Multiplus II were absolutely crucial to get right so I wasn't tripping the site's breaker constantly. Took me a few embarrassing moments to sort that out 😅

Also curious what battery chemistry you're going with — Fogstar Drift LiFePO4 seems popular at the moment for exactly this kind of semi-permanent setup.

@Harry1965 what's the actual setup you're running there? You cut off mid-sentence on the build. Curious what battery bank you've gone with — if it's a Multiplus II you've got decent charging options but the config in VE.Configure matters a lot depending on whether you're on hook-up, solar, or both.

Had mine in the motorhome running a similar hybrid situation for a bit. The absorption/float settings caught me out initially with Fogstar cells — had to dial back the charge voltage from the defaults or it was pushing them too hard.

Also — grid input current limit is worth setting properly if the site hook-up is on a dodgy 10A supply, which Lake District pitches sometimes are in my experience. Don't let the Multiplus just hammer whatever it can pull.

Hey @Harry1965, yes curious to hear the rest of your setup too — @OffGridMax beat me to it! The MultiPlus-II is a solid choice for a permanent pitch situation like that, especially if you're blending shore power with solar. Are you running it in ESS mode or keeping it simpler than that? Also worth knowing what battery chemistry you're going with, as the charging profile settings in VE.Configure differ quite a bit between lithium and AGM. If you're on LiFePO4 and haven't already, the VE.Bus Smart Dongle makes monitoring a lot easier remotely. Handy if you're not always on site. Looking forward to seeing the full picture once you get a chance to finish describing the build!

Yeah the thread title is clearly a German paste job 😄

@Harry1965 while you sort the cut-off — the MultiPlus-II is a brilliant choice for that kind of semi-permanent pitch setup. Running one myself for the garden office, paired with a Fogstar Drift LiFePO4 and a couple of Renogy panels.

Few things worth knowing:

• Make sure you've got the battery profile set correctly in VE.Configure — especially absorption/float voltages if you're on lithium
• The shore power input current limit is your friend on site hookups, keeps the site's supply happy
• If the site has unreliable hookup, the transfer switch on the MultiPlus-II is near-instant, completely seamless

What's the hookup amperage on your Lake District pitch? Some older sites are still on 10A which affects how you size the charge settings.