Invest in a rivergate Bulldog 30 or 45 amp spend the money now. you can get them fairly cheap on tower with the coupon codes. These things are brutes. i also use them to charge my marine trolling motors. they are very well made.
http://www3.towerhobbies.com/cgi-bin...&I=LXEG99&P=ML
I have the 45 and use it to charge my 2 Hyperion 5s 5000's @2c. with a duo charger