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Schneider Conext XW Pro won’t power on

golden

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Joined
Dec 10, 2022
Messages
11
Summary: I was able to get the Conext XW Pro to boot up and invert on first try. Today, it won’t turn on under similar conditions.

The long story: I purchased the complete hybrid kit from Signature Solar and spent a ton of time trying to make sure things are wired correctly.

First try
  • turned on all 4 EG4-LL 48V 100 AH Lithium Batteries V2 (circuit breaker + on/off).
  • turned on circuit breaker
  • powered up Conext XW Pro
  • immediately went into standby
  • when I turned it on, measured ~118/240V on the output loads

Today
  • turned on all 4 EG4-LL 48V 100 AH Lithium Batteries V2 (circuit breaker + on/off). turned on circuit breaker. powered up Conext XW Pro
  • unit won’t power up
  • batteries are at 52.61V, 52.60V, 52.59V, 59.59V
  • measured 52.2V before and after the battery breaker

Thoughts on what to try next?
 
Last edited:
Quick update: I heated the electrical shed another 10F degrees, and the system powered on. It was about 25-30F when I first tried this morning.
 
Hi,
Do you have the insight home to create a closed loop communication with those batteries? If so, please, post your feedback on the process. I am struggling to connect them.

You can find my post here: https://diysolarforum.com/threads/eg4-ll-v2-integration-with-schneider-insight-home.52819/
I won’t have my Insight Home connected until my longer cat 5e cables come in. I don’t think I’ll be able to set up the closed loop communication until I order the right cables to update the EG4 firmware (which will be months from now).
 
The EG4-LL's should have a pre-charge resistor. (I followed their process on YouTube without luck.) In the middle of nowhere, so also tried with a pencil + cables.
 
I think you're doing it backwards.
But, are the batteries displaying fault codes?

You should have the battery breaker at the XW on first. Battery breaker on. Then turn on the batteries (BMS) as the last step.
 
No fault code on the battery unless it’s too cold (happens in the early morning). Working on insulation and warmer for them.

I’ve tried the steps in the following orders, but no luck:

Battery on/off
Pre-charge resistor*
Battery Breaker @ XW
BMS

Pre-charge resistor*
Battery Breaker @ XW
Battery on/off
BMS

Battery on/off
Pre-charge resistor*
BMS
Battery Breaker @ XW

*off grid, so no resistor handy. Used 25ft of 14 gauge wire for ~ minute
 
In rereading your OP, you measured 52.2 volts after the battery breaker. Is that right at the XW?

Does the little display on the XW show anything when there is 50ish volts on the battery connection?
 
It's right at the XW's terminals. Every once in a while, when I flip the breaker, it will flash something illegible, but nothing permanent.
 
The XW should just need voltage at the DC terminals to power up and put something on th display. If you've got the DC polarity correct, I'd say it's time to get with the vendor and discuss warranty options.

If DC voltage is present at the XW, it isn't a precharge issue.
 
I just found this thread...

Have you figured this out yet? Is the XW-Pro powering up properly yet?
This is an odd problem. I never had an issue with the display on the XW coming on when I connect the battery. My first thought is the low battery cutoff setting is higher than the battery voltage. But even then, I would expect to have the "---" in the led display.

For the 120 volt generator to work, the XW-Pro would need to be converted to 120 volt only mode. Without doing that, the neutral will be open and it can't pull power from a single leg while in standby or bypass modes. Do you have any access to a 240 volt power source? Or do you have a 120 volt charger to try and get one of the batteries up to 54 volts from the generator? If you can get one battery charged up higher, that might be enough to get the system to power up if the low battery cut is the problem. Then you should be able to get into settings and dial it down. But don't connect the batteries together until the voltages are close again. AS those are LFP batteries, the resting voltage should stay in the flat area over a wide range of state of charge. 52.6 volts is 3.2875 per cell which is in the flat area and should be fine in normal operation. Pulling one up to 54 volts would be 3.375 per cell. That is just starting to get into the full charged knee area, probably about 80% state of charge or so. Still safe for the cells as long as they are well balanced.
 

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