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Lithi2-16 Breaker Trips - Trying to use CANBUS and RS485 Simultaneously

I'm having an issue with my batteries tripping the built-in breakers when I try to use both the CANBUS and RS485 communications at the same time - but ONLY if the PC running Ruixu Tools is plugged into AC power.

This is my scenario:

(2) Lithi2-16 batteries connected via standard Ethernet cable, operating for a couple of months without any issue, everything as expected.
The Master battery is connected to a Sol-Ark 12k, state of charge, current flow, etc., is displayed as expected on the inverter.
If I connect an Ethernet splitter (i.e. Deye/SunSunk/Sol-Ark RJ45 splitter from Solar Assistant), plugging the CANBUS into the Sol-Ark and the RS485 into the Ruixu-supplied USB adapter allows communication with both the inverter and Ruixu Tools on a laptop.
BUT if I plug the laptop into AC power via the standard power brick, both batteries immediately trip the built-in breaker and the logo flashes red. I have to then manually power them off, reset the breakers, and power them back on, after which everything runs as expected (I've also disconnected the RS485 at this point).
I've even tried creating CANBUS-only cables (i.e. pins 4+5) and RS485-only cables (pins 1+2+3) for the connection to the invertor / PC, but as soon as the PC is grounded the batteries trip.

Are the built-in breakers of the Lithi2-16 likely tripping due to a ground fault of some kind? Is there a way I could try to measure something to track down the problem? Note that I have no errors that have been logged by the batteries, and do not see anything indicated in Ruixu Tools noting an installation issue. Thanks for any help or ideas on this topic!

3 comments

Comments (3)

ruixu

Mar 01

I'm having a similar problem, except kind of the opposite.

I have two lithi2-16's paralleled together with a 6000xp as the documentation indicates.

Everything works fine until I disconnect grid power, then both batteries go into emergency stop.

When I say "disconnected grid power', I mean physically remove the wiring (I have it wired to a NEMA L14-30). Turning the breaker off does not cause a fault.

Candy_ruixu

Jan 22

Hi,it is highly likely that the circuit breaker was triggered. The communication lines between the circuit breaker, inverter, and battery are related to pins 3 and 6. When doing DIY wiring, make sure to cut off pins 3 and 6 on the battery side of the network cable.

NoWayMan

Jan 23

Replying to

Hello, thanks for the reply. However, I'm still having the issue. I've reduced the setup as follows:

Sol-Ark combo port connected to a standard Ethernet 1-3 combiner (all 8 pins on all four ports).
Ruixu output connected to combiner with a cable that has only pins 4-5 on both ends. This is confirmed to work for CANBUS communication to the inverter.
RTDI Ethernet to USB connected to combiner with a cable that has only pins 1-2 on both ends.

As soon as I plug the USB into a PC that is on a standard grounded circuit breakers on both batteries trip. I've also intentionally used non-body-grounded Ethernet connectors for the two custom cables mentioned above. How can there be any connection back to the batteries when they have only pins 4-5 connected and I've made sure to remove any pin 3 or 6 from all interconnect cables?

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Lithi2-16 Breaker Trips - Trying to use CANBUS and RS485 Simultaneously

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