A homemade 48-foot trimaran running entirely on solar panels, batteries and an all-electric Torqueedo propulsion system just completed the Great Loop. Jim Greer, the 75-year-old former filmmaker and captain of the boat, says it’s the first time a boat has done the Loop entirely under solar power. “With solar panels, batteries and Torqueedo electric motors, we were able to complete our travel days without any use of fossil fuels or plugging into marina electric hook-ups when we docked,” Greer said. “We don’t have a backup generator or power cords in case of emergency, and that’s the adventure of it.” Greer,…