PAIR OF 4 X 8 SOLAR PANELS. THESE ARE HEAVY DUTY QUALITY UNITS THAT WERE USED TO POWER A DOMESTIC HOT WATER HEATER SYSTEM. FULLY IN TACT AND READY FOR THEIR NEXT ASSIGNMENT. LOADED WCOPPER INSIDE BUILT TO LAST BY NORTHROP GRUMMAN. The solar panel expert has estimated that these will provide 31,700 BTUs per panel, per day, or, 9.28 kwh. Hope that helps with your usage plans.