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Solar can make sense under some conditions. One example is boon-docking while parked in sun, and where generator use is limited to a couple of hours a day. Some national parks limit generator use to one hour in morning and another hour in evening. Unless you have a lot of battery capacity and a high-capacity converter (battery charger), it may be difficult to get enough Amp-hours into batteries during that 2 hours to power what you want the other 22 hours a day.
Air conditioning is mostly out of the question, so solar can add extra Amp-hours to battery bank that may assist in powering residential refrigerators, microwave, coffee maker, or hair dryers.
Another option under these conditions (for when generator run time is limited) is upgrading converter and battery bank to increase charging rates in order to get more energy stored in shorter time.
We mostly stay in campgrounds with full hook-ups and usually boon-dock after driving all day, so solar would have not added value to us. Having said that, a friend is adding 670 Watts on trailer which should deliver between 2,000 and 3,500 Watt-hours on good days along Gulf Coast depending on time of year. On cloudy days he may not get much juice at all, so must rough it.
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