I have been using the Black and Decker Electromate 400 for many years at the ranch and love it. Air up ATV tires, jump start dead batteries in vehicles and ATV's and power a/c items (TV, lights, water transfer pump etc). I charge it once a month or after heavy use and it stays in the Ridgelines trunk year round.
http://www.homedepot.com/Tools-Hard...splay?catalogId=10053&langId=-1&storeId=10051
http://www.homedepot.com/Tools-Hard...splay?catalogId=10053&langId=-1&storeId=10051