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Proposed Commercial Solar Electric Water Heater
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ItemPrice Per UnitQuantityTotalNotesSource
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Electric Water Heater$280.001$280.00Sears
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Heating Element$10.001$10.00Amazon
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Thermostat$14.491$14.49Missouri Wind and Solar
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Solar Panels (340W)$217.602$435.20Extra fee charged for <4. Shipping rates better with moreecodirect
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Solar shipping$98.801$98.80Shipping for 4 panels divided by 2
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Schneider C40 charge controller$132.001$132.00C40 Charge controllerWholesale Solar
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8-2 Wire per foot$1.49/ft20 feet$29.80priced per foot, cost can change based on needHome Depot
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Total$1,000.29
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Current Propane Water Heater System
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ItemPrice Per UnitQuantityTotalNotesSource
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Water heater$244.991$244.99Water HeaterMAREY
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vent wall thimble$46.501$46.50Amazon
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vent elbow$56.231$56.234"Amazon
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vent termination$62.251$62.25
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2 propane tanks$29.972$59.94Says locally sourced. listed from home depotHome Depot
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CO & propane gas alarm$75.641$75.64Camping World
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150W panel$194.451$194.45Amazon
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D-cell batteries$18.671$18.67
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Charge controller$12.091$12.09Ebay
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Total$770.76
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Annual Cost$114.20
*Annual cost to heat 10 gal water per day with propane fill up cost assumed to be $4.25/ gal
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Analysis
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Capital Cost Difference$229.53
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Annual Cost difference$114.20
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Rate of Retern49.8%
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Payback Period (Years)2.01
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