Migration from 48V Pylontech to Eco-worthy at 51.2V

Made a similar jump recently with my shepherd's hut setup — moved away from a pair of Pylontech US2000s running at 48V nominal and switched to a 48V (51.2V actual) LiFePO4 bank from Eco-Worthy.

The voltage mismatch between what Pylontech calls "48V" and what proper 16S LiFePO4 chemistry actually sits at is worth understanding before you migrate. Pylontech uses a tighter charge ceiling (~53.2V), whereas a properly balanced Eco-Worthy bank will float closer to 54.4V fully charged. That ~1.2V difference matters more than it sounds when your Victron MultiPlus or MPPT is calibrated to the Pylontech profile via DVCC on a Cerbo GX.

Key things I had to sort after switching:

• Updated the battery preset in VictronConnect — stopped using the Pylontech fixed profile and switched to a custom LiFePO4 setting
• Rechecked absorption voltage and float voltage manually rather than relying on BMS comms, since Eco-Worthy's CAN protocol isn't always cleanly recognised by Cerbo firmware
• Ran a full charge cycle before parallel connection to avoid any circulating currents

One thing I'm still curious about — did anyone else notice the Cerbo GX state-of-charge reading taking a few full cycles to stabilise after swapping banks? Mine was reading about 8% optimistic for the first week or so before it settled down. Suspect it was still holding onto learned capacity data from the Pylontechs.

Happy to share my exact charge parameters if useful. Would be interesting to hear from others who've done this migration, particularly whether you kept DVCC enabled

@HighlandExplorer did you notice much difference in how your Victron kit talks to the new cells? That's the bit I'd be nervous about — Pylontech has proper DVCC comms baked in, whereas with generic LiFePO4 you're relying on the BMS doing its job quietly in the background with no real feedback to the inverter/charger.

Running a similar 51.2V bank in the van myself (Fogstar Drift cells). Had to manually tweak the charge parameters in VictronConnect rather than letting it auto-negotiate. Not a huge deal but worth double-checking your absorption/float voltages are set right rather than trusting defaults.

What BMS came bundled with the Eco-Worthy units?

@HighlandExplorer interested in this too — I've got a static caravan running on Pylontechs and keep eyeing up the Eco-Worthy packs.

Main thing I'd want to know is whether your Victron DVCC settings needed much tweaking. The Pylontechs handle all that automatically via CAN but I assume the Eco-Worthy units don't have proper comms, so you'd be back to manual CVL/CCL input on the MPPT and MultiPlus?

Also curious what you set your absorption voltage to — 51.2V packs seem to vary quite a bit on what the BMS actually tolerates before it starts grumbling.

@IanHenderson79 worth knowing that Eco-Worthy batteries don't support DVCC/BMS comms via CAN or VE.Bus the way Pylontech does — so your Victron kit won't get the state-of-charge and cell data handed to it automatically. You'll need to configure charge parameters manually in VEConfigure or the MPPT settings. Not a dealbreaker, but it's a genuine step backwards from the Pylontech integration.

For a static caravan setup specifically, I'd also check your charge current limits carefully — Eco-Worthy's BMS can be a bit conservative and will throttle unexpectedly if you're running a decent-sized inverter alongside EV charging.

Pylontech's ecosystem integration is genuinely one of its strengths, so make sure you're not trading that away purely on cost grounds without accounting for the extra setup time.

@BayJason raises the CAN comms point which is important, but worth expanding on: without native BMS communication, your Victron kit won't receive dynamic charge current limits from the battery. That means you're relying entirely on manually configured charge parameters in VenusOS.

For my garden office setup I went through exactly this transition — ended up setting absorption at 55.2V (3.45V/cell), float at 53.6V, and crucially setting a tail current of around 2% of capacity to avoid prolonged absorption. The Eco-Worthy BMS will still protect the cells at hardware level, but Victron won't "know" the state of charge with the same granularity.

Also worth checking your ESS or MPPT charge profile is set to LiFePO4 specifically rather than generic lithium — the voltage curves differ enough to matter for longevity.

@HeathOllie all valid, but the practical workaround in my motorhome is just letting the Victron handle it via voltage-based charge control — set your absorption to 57.6V (3.6V/cell × 16), float at 53.6V, and configure the low voltage disconnect sensibly, job done without CAN handshaking.

The Eco-Worthy BMS will still protect the cells if things go sideways — it's not completely naked. What you do lose is state-of-charge accuracy from the Cerbo, so your 80% reading might be fantasy. Fogstar Drift cells with a decent external BMS would've been my pick for a shepherd's hut install, but Eco-Worthy isn't the disaster some make it sound like if you configure the Victron properly from the start.