Goodall START·ALL® Commercial Jump Starters - Powerful 12/24 volt jump starting for those who need to get off-road construction equipment, transit buses and other 24 volt powered vehicles up and running, even in harsh conditions. Moreover, their voltage ratings fall in between the scale of 6-60 volts. As an example, if you have got a solar system whose volt range is 12 and amps are 14, then you will always be in need of a solar charge controller that possesses and encompassed by at least 14 amps. All in all, buying a solar charger is all about numbers. The 12 Volt Pup: A DC Generator You Can Build Grab a lawn-mower engine and an alternator to build a great 50 A power supply for Field Day or . . . By Yaniko Palis, VE2NYP The 12 Volt Pup on its plywood platform and ready to go. Does it look a little like Number Five from the movie, Short Circuit? Photo courtesy of James St. Laurent. A well-thought-out 12-volt electrical system in a recreational vehicle, or RV, allows for extended periods of remote camping and the reliable starting of the engine. The system comprises two separate 12-volt sub-systems; one serves the chassis system and runs the automotive part of the vehicle, and the other serves ... I want to hook an electric motor that will turn the alternator to charge the batteries. I'm not sure how this stuff works 100% and I haven't seen anyone ask this question. If I have a 12 volt motor turning a 24 volt alternator, it should send 12 volts to the battery charging it right?