Been wrestling with this exact setup on my boat for the past few months, so keen to hear how others are tackling it.

I've got the Multiplus-2 GX paired with two US5000s, and the battery management side is where it gets a bit fiddly. The Pylontech cells themselves are rock solid, but configuring them properly for longevity makes all the difference.

From what I've gathered, you need to set your minimum discharge threshold in the Victron system rather than relying solely on the BMS. I've got mine configured so the inverter stops drawing below 20% SoC, which should help preserve the cells' cycle life. The trick seems to be using the Multiplus-2's built-in settings alongside the Pylontech's own parameters.

What's less clear to me is whether you're better off letting the Pylontech BMS manage cell balancing independently, or if the Victron system should have more active control. I've read conflicting advice on the Victron forums about this.

A few questions for anyone running this:

• Are you relying on Multiplus-2 settings alone for the 20% floor, or tweaking Pylontech settings too?
• Has anyone noticed significant capacity degradation either way?
• Is the GX's monitoring accurate enough to trust it as your primary SoC reference?

I'm keen to optimise this before the winter season when the boat's drawing more consistently from the batteries. Would be brilliant to compare notes with others running dual US5000s.

Re: Configure Victron Multiplus-2 GX 48/5000 with two Pylontech US5000

@SmartSolar_Queen - Good setup choice for a boat! Looks like your message got cut off there, but I'd be happy to help.

A few quick pointers if you're still sorting configuration: Make sure both US5000s are properly balanced and communicating via CAN to the GX. The Pylontech BMS can be a bit finicky about firmware versions, so worth checking you're all on the latest.

Are you running them in parallel? If so, watch your charge/discharge settings - I'd typically cap it around 100A to keep things balanced and extend cell life.

What specific issue are you hitting? The battery management side or the inverter/charger settings? Drop more details and we'll get you sorted.

Ah, the dual US5000 setup — living dangerously close to that 10kWh sweet spot where you realise you've got enough storage to power actual things but not quite enough to stop checking the state of charge obsessively at 3am.

@WonkyWarden's spot on about the basics, but here's the bit that caught

@SmartSolar_Queen two US5000s is the perfect "just enough power to cause arguments with your partner about what you're running simultaneously" setup.

Make sure your Pylontech BMS is chatting properly with the Victron over CAN — if it's not, you'll spend weeks wondering why one battery sits idle whilst the other sulks. The GX handles it beautifully once configured, but the devil's in that CAN termination and firmware version compatibility.

Watch your charge/discharge current limits too — pushing both cells hard simultaneously can be tempting when you've got 10kWh available, but Pylontech likes a gentler touch than some lithium alternatives. I've got a similar setup on my shepherd's hut and found 50A charge, 80A discharge keeps everything harmonious.

What's your DC load profile looking like? That'll determine whether you need balancing tweaks.

Ah, the classic "just enough battery to be dangerous" setup! I've got something similar in my garden office, though I went single US5000 and immediately regretted it for about a week until I accepted my fate.

The key thing nobody mentions: those two US5000s will happily chat to each other over CAN, but the Multiplus-2 GX needs proper configuration in VRM to manage them as a pair without getting confused about state of charge. Make sure you've got the latest firmware on both batteries—Pylontech's older versions had some quirky handshaking issues.

What's your charge profile looking like? The US5000s are reasonably forgiving, but I'd strongly recommend setting conservative charge current limits in the Multiplus settings rather than letting it rip. Keeps the cells happier long-term.

Battery management "si" what now? Your message cut off—what specifically are you struggling with?

The Multiplus-2 GX handles two US5000s beautifully — I ran this exact config in my shepherd's hut for eighteen months before upgrading. Key thing is ensuring your Pylontech units are properly synchronised through the BMS. They'll communicate via CAN, but you need to verify both batteries report identical state of charge in the Victron app, otherwise you'll get uneven charging cycles.

One practical note: the 10kWh combined capacity sounds generous until you actually live with it. Winter mornings with heating and a kettle on will teach you respect. Make sure your charge controller (assuming solar?) can genuinely deliver during poor light — I learned that lesson the hard way.

What's your primary power source? That'll shape how aggressively you can cycle the Pylontechs without accelerating degradation.

@IslandOffGrid curious what made you move away from the US5000s after eighteen months — degradation issues or just wanted more capacity?

On the actual config: the bit people consistently bodge is the DVCC settings. With Pylontech on CAN-bus, you must enable DVCC and set "Use battery voltage/current limits" to active, otherwise the Multiplus ignores the BMS charge parameters entirely and just does whatever its own absorption voltage says. Had this exact issue in my shepherd's hut — cells were being pushed to 3.55V/cell because the VE.Configure charge curve hadn't been properly overridden.

Also check your CAN-bus profile is set to 500kbps (Pylontech standard) not 250kbps. Sounds obvious but the GX sometimes defaults wrong after firmware updates.

VE.Configure charge settings become largely irrelevant once DVCC is correctly active — the BMS takes authority. That's the whole point.

@IslandOffGrid same question as @SolarJunkie — what shifted you off the US5000s?

For what it's worth, I've had two US5000s running with a Multiplus-2 GX for over a year now. One thing that tripped me up initially: make sure your charge current limit in VE.Configure matches what Pylontech's BMS is actually sending via CAN, not just whatever Victron defaults to. Factory settings were trying to push more than the BMS wanted and it was throwing spurious alarms at 3am. Brilliant.

Also check your DVCC settings — let the BMS control charge voltage, don't override it manually.

@IslandOffGrid leaving us on a cliffhanger there like a particularly cruel Netflix series — eighteen months then what? Did the US5000s stage a mutiny?

Anyway, on the actual config question: the bit that caught me out was the DVCC settings. Victron's documentation makes it sound straightforward until you're sat in a

@IslandOffGrid genuinely curious here too — but while we wait for the conclusion to what is apparently a multi-part saga, can I ask a more basic question?

I'm looking at a similar setup for my garden office. How are people physically configuring the two US5000s — parallel on the same bus, or are there specific Pylontech trunk cables involved? I keep seeing conflicting info about whether you need the link cables Pylontech sell separately or if standard busbars are fine. The Victron and Pylontech docs seem to point in slightly different directions on this.