We love to exchange ideas and knowledge - here are some of our favorite free tools that we use on a daily basis
Estimate PV production with this tool from the NREL
Utility-approved production estimation for most California utilities
Free design, proposal, and estimation software
Find the wind speed, snow load, and seismic design data for most US locations
ASHRAE weather data used to calculate heat derates for wire sizing, and maximum voltage for string sizing
Calculate the tilt and azimuth of reverse-tilted and compound-tilted modules on a sloped plane with this free software from Solmetric
Free tool from Eaton to calculate fault current - requires creating a free login
A lightweight, open-source image viewer that flips through site photos more quickly than most built-in image viewers
Merge PDF's, extract pages, and delete pages - free with a max daily usage
Choose the "View Free Access" link - create a free account to access the viewer
Free access from ICC Digital Codes
Choose the "Free Access" link under the "California" heading - create a free account to access the viewer
Free access from UpCodes
Solar Energy International is an esteemed provider of live & online green energy courses - they offer this 6-hour intro course for free
A free webinar from Solar Energy International on utility-connected PV design
PG&E utility company offers intro and continuing education courses for free - create a free login to access
