I need to use an electric mower for my very large yard because I can't start a gas mower and my nearest neighbor is about 5 miles away. Living on a limited budget, I can't find anyone to cut the grass for what I can afford to pay. My yard is about an acre with about 30 trees. It has heavy dense grass. The extension cord would need to be at least 250 feet long to reach to the edge of the yard. My question is what gauge wire would I need to use to make the extension cord? The mower that I'm thinking about buying is a 12 amp mower. The circuit breaker for the plug at the house is a 20 amp breaker. Are there other things that I need to take into consideration? And if you have suggestions for a mower that would work well for these conditions, I'm open to suggestions. Thanks for any suggestions you can make. Carole