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You'll have to give some more information about your system to be able to help you.
I think I'd just use a 'generator start/stop' assistant to engage AC-in for such a system, but that shouldn't be the reason it doesnt work.
Can you measure at the battery terminals of the Multi what the actual voltage is there? My first suspicion would be a voltage drop somewhere.
You didn't post pictures of the cabling. checked all fuses in system?
did you set battery monitor in the CCGX to BMV?
Here are some photos of the system. Charger not enabled, virtual switch not enabled. grid feeding not permitted.
I've identified the problem. The batteries are cactus. I'm considering investing in NiFe to replace them. Not much info on them in this forum.... ..
Thanks for the update.
Out of curiosity I looked up your batteries, they're designed for 'floating' applications, like UPS systems / telecom power supplies.
Using these for cyclic applications you're lucky if you get 200 cycles out of them.
https://www.cyb.co.nz/content/industrial/telecommunications/batteries/uxl-specs/uxl220-2.pdf
I got them five years ago for five hundred dollars and they have done a reasonable job in that time. They were discharged to 22.5 v every day.
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