Some advice please. My Hatteras has the US electrical system, 110v mains 60 Hertz. While I was in the US finalising the purchase of the boat, I had an Acme Transformer installed which allows me to plug in the 230 volt power in Australia and it operates the 110v appliances on the boat. Australia has 230volt 50 Hertz. Whenever I moored at a marina the fridges and appliances worked fine but not all the Aircon units, which I assume is due to the single phase feed. I have been on a swing mooring for 18 months and only occasionally have used shore power. Finally I have been able to install a large mooring pontoon at my home and will have permanent shore power. Here is the problem I discovered: I found that when I use the shore power to charge the batteries, the charger runs up to about 25 amps for a short time and then automatically shuts down. The batteries are not getting charged. When using the generator, the batteries are getting a full charge. Also, this could be co-incidence, but the galley fridge compressor has seized and I am about to replace it with a new one from the US, it was very old (1978). The freezer works fine. 1. Is it a problem with the charger or is it the Hertz and if so, is there a remedy? 2. Does the difference in Hertz shorten the lifespan of appliances even when only used occasionally with shore power? On my previous boat, I had a similar set up with no problems. Thanks for your time.