7/30/01
summer 2001
33
Is It Worth It?
nAnnual kW-hour in Portland:
n 2144 h • 1.2kW = 2573kWh
nAt 5.87¢ per kWh = $151.02
n
n$5233/151.02= 34.4 years (batt)
n$4130/151.02= 27.2 years (no batt)
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