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. 11641. VM collector (average) efficiency of 70% (based on Florida Solar Energy Center, Solar Collector Test Report No. 97005) is used for this chart.
Latitude: 18.43 N Degrees
Longitude: 66.00 W Degrees
Elevation: 19 Meters
System Tilt: 21 Degrees
Annual Total BTU's per square meter (10 tubes): 4,811,467
Please read the Collector Tube Efficiency and System Sizing
sections before using this chart.