The boat AC system shown in this posting was designed by a highly experienced, qualified Victron designer. The highly qualified, local Victron supplier and the very experienced ABYC electrician who will install the system do not agree with the design. As can be seen below on Sheets 1 and 2, there are two 120/240v shore power feeds with each one supplying Input #1 of a Quattro. The 48/8000 Quattros are to be set for parallel operation, 60Hz, and 240v Out. On Sheet 3, the Output #1’s of each Quattro are interconnected and feed a 100a autotransformer. That autotransformer supplies all 120v and 240v to the boat.
The supplier and electrician are concerned that this design is not safe. If the two shore power outlets are not wired the same, they contend it would result in a short circuit, major failure, or other serious problems. They say that 2 shore power supplies should not be interconnected in any way. They contend that 2 shore power supplies must only feed 2 independent load center. The system designer designer contends that the system is safe since any unsafe connections are prevented by the Quattros.
Which position is correct? Is the design safe, as shown? Should it be modified? Does this design conform to accepted standards, such as ABYC?
