i'm guessing it's 115V, not sure exactly which terminals to test using the multimeter, there are 4 (2 line, 2 load) see picture:
elecpanel.jpg - Google Drive
also, any thoughts on these cheap pumps:
1.5HP IN GROUND Swimming POOL PUMP MOTOR w/ Strainer, High-Flo, Hi-Rate Inground | eBay
1 HP...