Solar Basics

Solar Efficiency is determined by the Total Solar Resource Factor (TSRF) at a given location. Solar Collectors gain their maximum efficiency and power output under full direct sunlight. Maximum efficiency and return on investment (ROI) of a stationary PV system is achieved when solar panels are oriented between Southeast and Southwest at a 15º to 45º tilt, and experience no shading from trees, buildings or other objects throughout the day. A roof with an east-west peak and a south face makes an ideal and cost-effective location for a solar array.

Pole mount, ground mount and dual axis trackers are also popular solutions.

If you think you have a suitable site for solar power, Willpower Electric, LLC will be happy to make an accurate assessment for you. We will determine your anticipated annual solar power production from the available space, calculate the TSRF, and accurately predict the expected annual savings on your power bill.


Willpower Electric, LLC’s design process includes obtaining Electrical Permits, Energy Trust Incentive Reservation, and Oregon Department of Energy Residential or Business Energy Tax Credits when applicable. We also provide the necessary documentation to receive the 30% Federal Renewable Energy Tax Credit for businesses or individuals.

Installation and follow through include system commissioning, final inspections by local Building Department and Energy Trust, a complete and bound owner’s manual, training, and an unconditional 2 year warranty on materials and workmanship in addition to manufacturer’s warranties on inverters, solar panels and balance of system components.

Let us know your questions.




Oregon Electrical Contractor C681 
CCB# 191852
NABCEP Certified
Energy Trust of Oregon Trade Ally - Oregon Tax Credit Certified Technician


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