My thoughts on hydroponic gardening in a SHTF situation.
1. In my experience, the expensive outlay of hardware isn't worth any increase in yield. You can achieve the same result by intensive farming in containers with good soil as from hydroponics.
2. In a hydroponic setup, you have to regularly add nutrient solution during the growing seasons. With containers or raised beds, one good fertilizer when the seeds are sown and and one or two additional additions of potash to the soil each growing season is sufficient.
3. Container or bed soil can be rejuvenated each season with compost and manure. Hydroponics need commercially produced nutrient solutions to continue to produce. If you choose to make your own manure, you will need animals or a supply of soy, barley, or other green manure seeds to plant between seasons.
4. Hydroponics and containers both lend themselves well to artificial light for indoor growing BUT ... the amount of power required to make indoor growing worth doing is WAY beyond the capacity of home solar. Pot growers who grown commercially indoor have to bypass their meters because the 10 times power consumption above that of a normal home is a dead giveaway to police. Also, the massive amount of heat generated by all that lighting makes the house look like it's on fire for thermal imaging. The idea of SHTF farming is to not draw attention to your crops lest someone come and take them away.
5. A greenhouse is a more practical solution, the more ramshackle and disused it looks from the outside the better. It will extend the growing season and make the possibility of multicropping easier.
Any other thoughts?