Energy Production Calculators/Software
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PVWatts:

http://www.nrel.gov/rredc/pvwatts/



In My Backyard:

http://maps.nrel.gov/imby



Solar Estimate:

http://www.solar-estimate.org/index.php



Sizing Workbook by Lloyd Dinkelspiel:
http://www.lwd.com/solar/



SMA Design Tools:
http://www.sma-america.com/en_US/services/solar-design-tools.html

Sunny Design
http://www.sma-america.com/en_US/products/software/sunny-design.html

Voltage Drop Calculator
http://america.sma.de/vdropcalculator.html



CA State Rebates:

http://www.gosolarcalifornia.org/csi/rebates.php

http://www.csi-trigger.com/

http://www.csi-epbb.com/default.aspx



Incentives:

http://dsireusa.org/