A useful conversion for (solar) energy:
1 kWh/m2/day = 317.1 Btu/ft2/day
Using this to determine solar energy production feasibility, based on data from:
- http://rredc.nrel.gov/solar/calculators/PVWATTS/version2/readmefirst.html
- http://www.nrel.gov/docs/legosti/old/7904.pdf