Quick Sanity Check-- Datouboss 5500, ecoworthy 100ah 48v battery, Eaton Br816L125Fdp

Has anyone actually run a Datouboss 5500 with a lithium pack long-term? I'm curious whether the communication between the inverter and that ecoworthy battery is stable or whether you end up essentially running it "dumb" with no proper BMS handshake.

The Eaton panel is a solid choice for the distribution side — I've got something similar on my narrowboat setup and it's been rock solid — but I'm wondering about the weak link being the battery/inverter relationship rather than anything upstream of it.

A few questions I can't quite get my head around:

• Is the ecoworthy 100ah 48v actually pushing its BMS data to the Datouboss via CAN or RS485, or is it just relying on voltage cutoffs?
• What's the discharge rate limit on that battery under sustained load? The 5500W inverter could theoretically hammer it quite hard
• Has anyone seen the Eaton panel cause any earthing or neutral issues when paired with an off-grid inverter like this? I've had some odd behaviour on my own setup when the neutral bonding wasn't quite right

I ask because I'm speccing something vaguely similar for a tiny house project and I keep going back and forth between a budget stack like this versus just biting the bullet on Victron + Fogstar. The price difference is significant but so potentially is the reliability gap.

Would love to hear from anyone who's actually got this combination running rather than just the theoretical side of things — real-world data always beats spec sheets!

Ran a similar setup for about eight months — the short answer is: don't expect proper comms between that inverter and a budget BMS battery. The Datouboss doesn't speak CAN or RS485 in a way that plays nicely with most own-brand lithium packs.

What actually works better is setting the inverter to user-defined battery mode and manually dialling in your charge/discharge voltage limits to match whatever the ecoworthy BMS will tolerate. No fancy handshaking, but it's stable.

Bigger concern with that Eaton panel — make sure your breaker ratings match your actual load. 48V lithium can dump current fast if the BMS lets a fault through.

Honestly, if you're going long-term, a Fogstar Drift or something with a decent JK BMS would save you headaches. The ecoworthy pack is a bit of a gamble.

@MarineGaz curious what protocol the Datouboss is actually expecting — is it CAN or RS485? Because the ecoworthy 48v packs I've seen tend to use a proprietary BMS comms that doesn't map cleanly onto either standard.

Specifically wondering:

• Does the inverter fall back gracefully to dumb charging if comms fail, or does it fault out?
• What charge voltage limits are you setting manually if you're bypassing comms entirely?
• Is the Eaton panel in the OP just there for AC distribution, or is it doing anything active in the loop?

Running a Victron setup myself on the motorhome so comms reliability is something I've had to think carefully about. Victron's DVCC at least handles comms dropout sensibly. Not sure the Datouboss has equivalent logic — anyone seen the manual's fault behaviour section?

@BevJackson64 it's RS485 on the Datouboss from what I can tell — but the Dumb/Pylontech protocol thing is a bit of a lottery with budget kit. I had a similar headache trying to get my Fogstar Drift to talk to a cheap inverter properly. Ended up just running it in "dumb" mode with voltage-based charge control instead. Not ideal but rock solid for 18 months now.

With that Eaton panel in the mix too — are you tying this into a proper sub-panel or just emergency backup circuits? Makes a difference to how fussy you need to be about comms vs just nailing your charge/discharge voltage params manually.

Victron kit would sort this properly but obviously that's a different budget conversation entirely 😅

Been down this road myself — not with the Datouboss specifically, but a comparable Chinese inverter paired with a budget 48V pack on my boat. The comms "worked" in the sense that nothing caught fire, but the BMS and inverter were essentially ignoring each other's charge parameters entirely.

What actually saved me was ditching the comms cable altogether and manually programming the inverter's charge voltages to match the battery's spec sheet. Crude, but reliable.

If you want proper closed-loop communication long-term, honestly the Victron ecosystem is where you end up eventually — painful lesson that cost me a season of frustration. The ecoworthy batteries aren't bad cells, but their BMS firmware rarely speaks anything a non-Pylontech inverter actually trusts.

@DownsExplorer is right about the protocol confusion — that "Pylontech mode" on generic inverters is often more of a prayer than a protocol.