I'm a little late to this thread...and nothing new to offer on the "safety" aspects. However I just replaced my GI with an IT. In part, since I'm going to be residing in a marina for the foreseeable future.
But what was not mentioned is the load balancing offered by the IT. I have 3 120V A/C units wired on one side of a 50A 240/120 service
connection. With all three units running, that pretty much saturates that side. It came that way, like some other all electric
boats since if the galley
stove is in full operation, it saturates the other side.
, a weak connection on the shore power
outlet pretty much welded my plug
to the pedestal
. While the ships end was just fine. The weak connection is the friction connections on the plug
. The IT balances the load, so that with just A/C, I'm pulling 1/2 the current
on the shore power
cable, with the 24/7 A/C loads. Obviously with the galley
going, there is little improvement. But that is usually transient, and overall the loads on the shore power connections are reduced significantly. This doesn't apply much for EU wired boats, or US boats with 240V A/C. But I have seen several 40-50 ft US powerboats wired this way...
It is more expensive, but does not have to be thousands. I found a used transformer for $300, but did someone mention heavy? The motor
freight Virginia to Florida
was another $200....