I just sharing my experiences. I have spoken to well over 100 State of California state licensed professionals. They had to pass some test to be a licensed professional.
You know what all of these solar professionals are connng customers to buy? Battery packs. These things are $10k. I think they are making a nice chunk of change from the sales of these things becaus they are all pushing them. They know nothing about the things such as they are only 60% efficient. The other 40% is lost as heat energy in charging and discharging the batteries.