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Make sure that your expectations are realistic. During the Texas freeze recently a number of people that expected to use solar panels for backup power reported they were only getting 10% from the rated capacity of their panels. It would be unfortunate to depend on 200 watts but then find that you only had 20 watts to work with.
Whatever you buy, test it before you have to use it. That way you will know how to use it and understand its limitations before you out and about with a dead phone.
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I mentioned in a different thread concerning "solar generators" about how deceptive these companies are and how they will imply anything to make a sale.
For instance, there are people that consider a generator the debil because it uses gas, so they get a "solar generator" because it's like free electricity. They think they can power an entire home for infinity on one charge. When it needs recharging some of them use their vehicle (it takes over 6 hrs for a full charge) and still consider themselves green and holy because they didn't use a generator.
I have 2 100 watt panels, they both input 125 watts on a fully sunny day, I'm told that to protect the battery.
The point is, these solar companies exaggerate if not outright lie. What works for an overlander living in a van doesn't necessarily work for a home during a prolonged outage.
The bottom line is we are sacrificing our infrastructure under the guise of being "green". The governments goal is to make it so expensive we have no choice.
What happened to those subsidized solar industries from the obama administration? They went bankrupt, took the money and ran, now most of the solar industry is made in china. It only lasts so long, then it goes in the trash and must be repurchased.
It's as far from "green" as can be.