In my 15 years designing and installing solar and Storage systems, one of the most common questions I received was how can i compare multiple proposals to make them apples to apples.  This can be difficult to do when there are so many variables like:
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1) Product and Technology differences.
2) Vendor quality and viability
3) Product and Labor Warranties.
4) Vendor Support
5) Energy storage with solar vs Generators
6) Multiple PG&E Rate schedules
7) Best System size to meet your needs
8) Visual ascetics of system.
9) Selecting PG&E vs Sonoma Clean Power
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Our consulting focus is to provide the best long term value not the lowest upfront cost.  Having been involve in Sonoma County Solar organizations over the past 15 years, I can also provide a list of the vendors that  meet your needs, and that can provide you with the best support in the years to come.