When using the adapters you will at some time pop a breaker due to overload, but it's not an issue, just turn off the extra power (hair dryer, heater, or whatever) and turn the breaker back on and your off and running again. We've used adapter from 50 to 30 to 20 and while making coffee with some lights on, the wife turned on the hair dryer and everything shut down.... turn off one of the appliances, flip the breaker and back in business. - (coffee had to wait 'til hair was dry)