Keeps both Ultima's charged even during a 16,000 lbs pull @ 1800 rpms from my "set throttle". My barn is solar/battery/inverter powered. W/a feed to my house. I have a huge battery bank in my barn using 29" tall utility Co batts and 15k watts of inverters. I set my throttle @ 1700 rpms & it will power the essentials, and them some, of my whole house.
Plus it's a hit jump starting "Soccer Moms" when out "Mall Wheeling"!