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Fields with blue text are user-inputs. Other fields should not be changed.
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Electricity rate, system cost, and tax credit assumptions are input below.Input your monthly usage here (from your bills or GVEA web portal):NREL PVwatts model is used to predict energy produced by PV system. The monthly output from PVwatts for a south facing array tilted at 50degrees and with 14% losses and 96% inverter efficiency is in the "PVwatts Output" tab. User may model their own system parameters at https://pvwatts.nrel.gov/pvwatts.php and copy and paste the monthly .csv output into the "PVwatts Output" tab.
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UnitsValueSourceMonthHousehold Electricity Usage [kWh]
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Residential Electricity Rate$/kWh$0.237
http://www.gvea.com/rates/rates
January447
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Avoided Fuel Cost$/kWh$0.110
http://www.gvea.com/rates/rates
February481
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Tax Credit Rate%26%https://www.irs.gov/newsroom/energy-incentives-for-individuals-residential-property-updated-questions-and-answersMarch441
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System Lifeyears20April412
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May494
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"Behind the meter" SystemJune463
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"Behind the meter" System Size
kW_DC2.9This is calculated for you. It assumes a system that meets but does not exceed your load in any given month.July384
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Estimated System Cost$/W$3.00 August372
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Expected System Cost$$8,654 September378
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Expected Tax Credit$$2,250 October445
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Expected Net System Cost$$6,404 November444
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Expected Annual Energy Cost Savings
$/yr$698 December550
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Simple Paybackyears9.2
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Annualized ROI%/yr4.0%
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Reduction in Grid Energy Usage
%55.5%
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User Selected System
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User Selected System Size
kW_DC
5.12This is changed by you. It can be bigger or smaller than the "Behind the Meter" system size. Net metering is calculated if applicable. Keep in mind that $/W may change with system size.
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Estimated System Cost$/W$2.75
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Expected System Cost$$14,080
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Expected Tax Credit$$3,661
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Expected Net System Cost$$10,419
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Expected Annual Energy Cost Savings
$/yr$1,059
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Simple Paybackyears9.8
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Annualized ROI%/yr3.6%
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Reduction in Grid Energy Usage
%98.5%
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