I know that most aplliances designed for 60herts will work just fine on a 50herts system--well, maybe just a little slower, but they still work. I have been using U.S. 120v-60herts appliances on 120v-50herts European system for about a year now. I am worried that eventually, the difference in herts might have damaging effects on my aplliances. I am especially worried about battery chargers. I have a battery charger (designed for 60herts only) that charges a battery for an expensive piece of equipment. Once the battery is charged, it should hold the charge for about 4 days before it needs charging again. Well, lately I have been having to charge the battery just about every day. I am wondering if the difference in herts might have damaged my battery/battery charger? What about other aplliances such as: Refrigerators, microwave ovens, irons, toasters, stereos, etc. Can these aplliances be seriously damaged if I continue to use them on 50herts even though they are rated for 60herts? Help! Sparky74