This page provides solar radiation values for VM Solar Collectors and expected gallons of water raised by 60 degrees F. Radiation figures are from the Solar Radiation Data Manual, WBAN NO. 13881. VM collector (average) efficiency of 70% (based on Florida Solar Energy Center, Solar Collector Test Report No. 97005) is used for this chart.
Latitude: 35.22 N Degrees Longitude:80.93 W Degrees Elevation:234 Meters System Tilt: Latitude Annual Total BTU's per square meter (10 tubes): 4,363,254
Charlotte, NC 
