How much is silence worth? Silence and privacy are the main reasons that we seek out boondocking sites. So it is hard to put a price tag on that intangible benefit. I wish I had gotten solar sooner than I did, but I was too cautious -- penny wise and pound foolish.
By the way, we have just a 120 watt portable setup, and it fills all of our needs, except after a few days of clouds. We carry a Honda 2000 generator just in case and have almost never used it (except for monthly maintenance at home).