Originally Posted by Catalysis
You might try installing a Victron 3600 isolation transformer it apparently switches between 110 and 220 automatically and supports both 50/60 cycles.
I have been considering one - does anyone have experience with these?
Those Victron iso transformers are good for a European boat that comes to US-land but they are not good to take to Europe
a US boat with dual US-style 220-110 wiring
(as in a US house) because those transformers do not have the three taps that would be required.
That said, if your PDQ
44 is similar to the Antares
44s I am familiar with, then that caveat does not apply to you because your washer dryer uses 110V and your two 110V shore inlets are not "combined" to "make" 220V onboard, hence you should be fine with one of these.
I understand that s the little glitch that this transformer does not meet ABYC standard 188.8.131.52.2.3 on shield faults (only relevant if the transformer itself fails) but it will make sure the green wire does its job even if the shore wiring
Summarizing on the safety
side, this trafo helps on safety
even when connected to a US dock
where you do not need to change voltages, but IMHO you should consider that a better bang for the buck on safety comes from taking your boat to compliance with current
ABYC standards by adding a whole-boat ground fault device that I bet your boat does not have. This is cheaper than an iso transformer and there is a reason why it is mandatory on new boats, while the iso transformer is not mandatory.
Regarding frequency, this and most transformers will tolerate both 50 and 60 Hz, but they will not change it, hence if you take your boat to 50Hz land you should be aware that your washer dryer (if the same as newer boats) will not like 50Hz at all and the air con units will cope with 50Hz but may suffer.
If all you want is voltage stepdown to go to 220V land marinas
and use everything but dryer and watermaker
and probably air cons while connected to shorepower, then this piece of kit will do the job. Just note that this unit is designed to be mounted inside, hence you either need to make a box to leave it at the dock
both cords to that box) or buy one for each shore circuit and install them "permanently" replacing the existing galvanic isolators.
If you are interested in safety I think you should consider retrofitting ground fault devices first. If you send me a PM I can give you part numbers for a drop-in replacement of your shore breakers that will add ground fault devices that cover the whole boat.. This cheaper and more important than an iso transformer under most circumstances.
If you are interested in connecting to 220V-only docks ocassionaly then I would suggest you also look at chargers that can take both voltages such as the Victron Centaur that are installed inside the boat and can be used as an alternative to the shore connection while in 220V land (say Pacific 220V islands), while you run all AC loads (including air con) off the inverter
(assuming it is up to the job). There are also "no mounting required" step-down transformers such as the one used by the Antares
yard in Argentina