I don't consider solar to be a primary power solution for most anything. No question it could likely be nice to have in some circumstances but it's not reliable enough to count on, especially an "emergency". By the time you implement a system that can ride through clouds and ~18 hours of no sun a day, you save a step by just bringing more batteries, or a generator. Solar adds cost, weight, bulk and complication to a much greater degree than storage or a generator so unless this is a casual operation where failure is an option, or "solar only" for some reason, it isn't among my first choice for powering radio equipment in the field.
Mark K5LXP
Albuquerque, NM