I am getting the error 28 quite often with my 2 6000XP. The lights will flicker and when I check on the inverters the power has switched to grid even though I may have over 80% battery. I have checked the com cables and they are secure.
Any ideas??
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November 9, 2024 9:17 pm
7 Replies
November 12, 2024 4:01 pm
I am getting the error 28 quite often with my 2 6000XP. The lights will flicker and when I check on the inverters the power has switched to grid even though I may have over 80% battery. I have checked the com cables and they are secure.
Any ideas??
What is the discharge current limit set to? Also, what size is the battery bank?
With two inverters, the minimum this should be set to prevent EPS overload would be 234A with the max allowed 280A.
November 10, 2024 3:30 am
Have you tried re-routing the comm cable, or maybe even a shielded cable (maybe it is getting some signal bleed from the power cables)?
Also, if the slack in the cable is looped, try routing around the perimeter of the conduit box instead, or try vice versa.
Do you have any fluorescent lights nearby? Have you noticed if they are on when the errors occur?
If you are crossing a 110AC or 220AC line with the comm cable, try to do perpendicular.
Is the comm cable in the same conduit as the AC lines? Try putting it in its own conduit.
Just some ideas from my networking days.
Best of luck and keep us posted please,
JB
November 10, 2024 3:02 pm
Thank you for the suggestions. It is looped inside a chase with a lot of energized wires. I hope I can get the cable outside of the chase as the inverters are both sitting on top of the chase.
I have noticed that it usually happens when there is a large demand/draw. If EG4 is around, would punching a hole in the side of the inverters to run conduit void the warranty?
November 12, 2024 2:49 pm
@edo222 Nice looking setup!
The wiring of the comms looks good. I have attached an image with an area circled. It appears that the comm wire has a pretty tight loop. Try straightening that out and see if helps any. Otherwise, the com cables look good to me. I sometime see them zip tied to the AC lines and that can cause some issues but yours look as well separated as you can in the box and tend to cross perpendicular so I guessing that it is not interference. If you want to really test it, you could pull the covers and drape them external just to make sure?
Just an idea.
Thanks,
JB
November 12, 2024 12:46 am
I think my real problem may have been EPS overload and not merely loss of parallel communications. I try to set the discharge current limit to 280 instead of the 140 default. The monitoring program will indicate that the change is set, but every time I come back to it is indicates that the discharge current limit is 140.
November 12, 2024 2:39 pm
Is that your battery discharge current?
If so, and this is just a guess, if you are using closed loop to talk to the batteries, then I am guessing that the battery discharge current is being handled by the BMS's not by the monitor. The only reason I think that is because if you mouse over the questions mark it indicates that that value is related to lead acid batteries. ???
JB
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