I am having trouble with the UPS function. When disconnecting from 50Amp shore power the inverters work seamless. But when the generator is running and it shuts off the inverters shut down for about 20 seconds before restoring power. Why is the the UPS function causing this to happen only with the generator.
Setup
2 quattro II 12/3000 2x120 only using one leg in and out of each inverter
Shore power wired to AC in 1
Generator power wired to AC in 2