I see you guys run battery chargers in your pump boxes, unfortunately I don't have the luxury of 110v at my sugarbush, so I just use the battery itself. I work In the marine industry and I just use group 24 deep cycle marine batteries. Mine will run for close to 10 days without a charge. The pumps are only cycling and building vacuum, it's when they have a head pressure that they start to work hard. I ran mine for three 8 hour days and checked my voltage and they where still at 12.6 v. So you guys who want to set up shurflo systems I wouldn't worry to much about having electricity at the pump box.