So sorry for not replying here completely distracted on non cbus issue. @DarylMc no it failed while 3 units were disconnected and voltage was sitting at 26.5 before it failed. I didn't get to go onsite anytime it was failing. I did however add a din rail supply and we thought that was it however it has failed now twice in 3 weeks but at least frequency is greatly reduced. Before I added that supply it was failing typically 4-5 times per week. Next step I think is to add a UPS.
