I'm going to start stock-piling what I need to make my own solar panels. I know I can make 1 solar panel that is about 2'x4' in size that will make enough power for that easily.
The "make your own" panels usually use cells salvaged from other panels, and while yes, this works, those cells really ought to be electrically matched to get decent yield out of them.. otherwise the weakest cell limits the others. Same thing happens with strings of store bought panels - they need to be matched. Also, since this is a critical path difference between life/death project I wouldn't be placing those bets on used parts or connections humans made -- these things will be out in hard, dusty, wind, hot and cold environments, and your soldered connections and framing have to be up to that. Doesn't mean you can't make frames, seals and connections as good as any manufacturing plant, but you are literally betting a life on your work.
Chinese made panels are good and can be had for pretty cheap ( but you can't take the tax credit on them) but even an American panel will be running you $5 a watt - $500-600 a panel .
I should think for this project I would consider a manufactured panel, and a spare ( or two) so you know it can withstand the environmental issues. One 240W panel will produce about 1 Kw-Hr per day- enough to run a good sized freezer. . I would have a back up gen on hand as well, and maybe augment it with a 200 W wind generator. Battery bank should probably be sized to handle a 3-5 day outage.
Also, look at
converting a chest freezer to a fridge. Its probably more economical than going after a DC version if you need the storage space. Yes that does mean getting an inverter. Trust me, everything is AC and eventually you will want to plug other stuff in post Teotwaki.
I think the energy saving claimed in the link are over blown, but still substantial. Of course installing it in a basement/root cellar/crawlspace kept at 54 degrees helps a lot.