I have the old 1900-DC with the PEM-DC modules and I want to upgrade them to the PWR-2700-DC. I do not want to have an outage for my customer. Can I have mixed power supplies active? This is what I want to do. I will shutdown one 1900, remove/install the 2700, power that backup and do the same for the other 1900. I know they load balance between.
I have this problem too.