Sao74,   I think the issue is down to compatibility, as I am not showing that power supply as supported. Now I do show a 1100w DC power supply supported for the R730XD, but its part number is 5G4WK or 450-ADZC.    
Hi! Ideally I want to be able to use 1 AC PSU and 1 DC PSU for a r730xd server but I've learned that this is not possible. So when trying to use 2 DC PSU (Astec Power 1100W model E1100D-S0 Rev A00-00) the server starts and I see Initialize PCI, USB and Video on the attached monitor and after that message the servers shuts down and both DC PSU start to blink which should mean that there are some mismatch in the configuration.Back with AC PSU and start server and then I see this error in the event log: PWR1006: The system halted because system power exceeds capacity in combination with the previous shutdown. I have tried the same approach with 3 730xd and they all end up with the same result.Doing the same with r540 servers I come all the way to pressing F2 for System setup and then servers shut down and both DC PSU indicate mismatch. LC log:PWR2265: The power supply unit (PSU) 2 is disabled because of a configuration mismatch and therefore the PSU is not supported on the server. Any ideas out there in how to get DC PSU to function in these servers? Or is the real problem that I do not have the correct/supported PSUs? RegardsStefan      
PSU r730xd/r540