I'm still learning, reading and asking about solar myself. The wiring has a lot to do with the amount of gain or loss, panels you select and battery bank you are depositing the solar into. There are a few YouTubers who have put in some killer systems and it gives a breakdown of what products they used, etc.
Hebard's travels and Pau Hana are two that come to mind.
I have been in contact with Brian Boone, who is an RVer traveling the country doing solar installs. People rave about his knowledge and installs. From what I read and understand, 70% is about right. Keep in mind that with the panels laying flat, any shade from the air conditioner, satellite dish, etc. affects those panels as well. I'm planning on 5 200 watt panels for my system. We already have a 5500 generator and have the Auto Generator Start system to work in conjunction with the battery voltage. Just my thoughts on the subject.
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