Probably a few different definitions out there but boondocking is no hookups usually in remote location. Though I have been in state parks with no hookups.
Dry camping often means electric only, no water but even that varies.
As I mentioned, if you are camping with no hookups, rather than using the system as a battery maintainer between trips; then chances are you will want every last watt you can get.
The next question is how much power do you need. How many watts per hour do you use? 160 watts time the number of sunny hours give you the number of watt/hours you have, minus losses. Cloudy skies will reduce the output.
