Yeah... before anyone gets too excited, this isn't for my food (I will continue PCT hanging well away from camp) but for my campsite.
I know the actual odds of a random attack on an immaculately-kept campsite are almost vanishingly low, but it does happen from time to time, and the basic purpose is to quench my otherwise-unshakable paranoia and just allow me to sleep without a care. Particularly when alone in potential grizzly habitat.
I have had a bear spend way too long circling and sniffing the perimeter of my tent in the middle of the night (read: poking his nose into the fabric inches from my face), and that is not a fun experience. I was younger then and didn't respond appropriately at all (I froze up and didn't make a sound for hours, instead of getting up and scaring him off), but even now, I'm pretty sure that I don't want to even have to make the decision to get up (or not) and open the tent door into the face of a bear at 1AM ever again.
Back to the food ideas. While this sounds like it might be good and effective in one-off scenarios, I wouldn't want to see it becoming common to replace other food storage techniques with small electric fencing. In habituated areas, I imagine the bears will fairly quickly learn that the fencing can be compromised by digging, or knocking down posts, or charging, etc. A setup this light is really quite ineffective against a determined and smart bear over a long period of time.
In my case, the intention is different: a deterrent for over-curiosity from a bear with no specific intent.