Multiplus 2 + Pylon charge voltage

Been mulling this one over for a while and thought I'd throw it out here.

Running a Victron setup myself — Multiplus-II 5000 with a Cerbo GX and a SmartSolar MPPT — and I've been looking seriously at Pylontech batteries for the next phase of my build. The DVCC integration with Victron is obviously a big selling point, the idea that the BMS talks directly to the system and handles charge voltage automatically sounds brilliant in theory.

But here's what I keep wondering: how much do you actually trust it in practice?

From what I've read, when you've got multiple Pylontechs on the CANbus, the system is supposed to negotiate charge parameters across the whole bank. What I can't get my head around is whether the Multiplus-II honours those charge voltage limits consistently, especially when AC input drops out and the inverter's doing something unexpected.

Has anyone here had issues where the charge voltage crept above what the Pylontechs were actually requesting? I've seen vague mentions of this on other forums but nothing concrete.

Also curious whether anyone's running this kind of setup fully off-grid (no grid tie, no generator backup) rather than as a hybrid — wondering if that changes the behaviour at all since the Multiplus isn't constantly switching between charge sources.

Would love to hear from people who've had theirs running long enough to really stress-test it. What should I actually be checking in VRM to confirm everything's behaving?

Hey @NotAnElectrician, looks like your post got cut off there, mate! Finish your thought and we can properly dig in. 😄

That said, I'm running a very similar setup with Pylontech US3000Cs, so happy to help when you complete the question. One thing worth mentioning preemptively — if you're going the DVCC route with the Cerbo managing charge parameters, Victron's compatibility list and Pylontech's own recommended settings don't always tell the same story. The CVL figures in particular can catch people out. Worth checking your firmware versions on both ends before changing anything.

Yeah @NotAnElectrician looks like you lost the rest of your message there. Finish the thought and we can help properly.

That said, if you're heading where I think you are with Pylon + Multiplus-II charge voltage — it's a common rabbit hole. My setup runs Fogstar Drift cells with a Cerbo and the DVCC settings are crucial to get right before touching anything else. Pylon units generally want the Cerbo handling charge control via CAN rather than setting voltages manually on the Multiplus itself.

Worth knowing your exact Pylon model too — the US2000 and UP2500 have slightly different recommended parameters.

@NotAnElectrician welcome to the forum — good to have another Victron user on here, there's plenty of us who can help once you finish your thought.

Pylon + Multiplus-II is a well-trodden path so whatever your question is, chances are someone here has already made the exact mistake you're trying to avoid.

Post the rest when you're ready — worth including your battery model (Tech, Force, US2000 etc.) and whether you're on DVCC, as that changes the answer considerably.

@NotAnElectrician looks like the gremlins got your post mid-sentence — three of us waiting on the edge of our seats here.

That said, I'll take a guess based on the thread title: if you're asking about charge voltage settings for Pylontech batteries on a Multiplus-II, the short answer is don't override the BMS-defined values. With DVCC enabled on the Cerbo, the Pylontechs will handle charge voltage and current limits via CAN bus automatically. A lot of people get burned trying to manually set absorption/float voltages on top of that — you end up fighting the BMS.

Finish your original thought though — there's enough detail missing that I might be barking up entirely the wrong tree. Are you looking at US2000s, US3000s, or the newer Pylontech Force units? Makes a difference to the conversation.

@NotAnElectrician my Pylontech literally finished your sentence for you — it just didn't bother telling the forum.