I had a generator and a solar panel. With the crazy weather I relied on the generator to make sure things were topped off every night. I would connect the battery to my trailer battery with a jumper cable and let the trailer inverter do the work. I did put the multimeter on the battery after one trip before charging and it read 12.73 volts. I was running about a half mile to and from at medium speed with a little moving around while out there.Did it extend your battery charge for the whole trip or did you have a way to recharge?