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resources home
net metering
solar info.
electrical rates
tax information
quick estimate
solar products
net metering
solar info.
electrical rates
tax information
quick estimate
solar products
Note: the quick estimator is currently only functional for Maui Residential Customers. Commercial clients and other
Islands should call for a quick estimate over the phone: 808-575-2202
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Step 1
While people like to think of their electric bill as a dollar amount, it is based on energy usage, or kilowatt hours.
Reference a recent energy bill, and refer to the column showing average kWh/day as seen in the diagram. You can fill out one
month or all months for greater accuracy.
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If you don’t have a bill but you know approximately what you pay, you can divide your monthly charge by 31 and then divide
by $.29 (utility kWh rate as of April, 2010) then enter the number of daily kWh consumed in one of the months in the table above.
Example: $200/month bill ÷ 31 ÷ $.29 = 22 kWh/day.
Example: $200/month bill ÷ 31 ÷ $.29 = 22 kWh/day.
Step 2
Choose your zip code. This is important because each area has an estimated number of sun hours. It should be noted that zip
codes don’t always yield accurate sun hours and your system could produce more or less energy once installed.
zip code
Your results are as follows:
average kWh / day
target daily use
AC system size
DC system size
upfront cost
federal tax credit
state tax credit
net system cost
Avoided energy cost per month
Avoided energy cost per year
Total tax incentive for the project
% project covered by tax incentives
Estimated payback period (years)
Total positive cash flow after 10 years