Solar Calculations

• 1kW pv system - 1400 kWhr
  • 6 hr/day average - not! 3-4.5 kwhr/day [1]
• Fuel is about 35 kWhr/gal [2]. Let's say it's used for generating electricity - about 33% efficient - [3].
• To get electricity - 11 kWhr/gal equivalent. Gal is about 3 kg
• This gets us to 127 gallons of fuel displaced - 42 gal. Ie - each kW installed gets rid of 3 barrels of oil!
• Let's do PV roof on SEH - 7 kw - 21 barrels of oil displaced!