I can give a few tips:
For solar panels and the like, check out Goal Zero (http://www.goalzero.com/
). Their products aren't cheap, but they ARE worth it. I used of the Sherpa rigs every day for over a year without fail. You can definitely find cheaper solar gear, but it will be just that; cheap.
Electronics-wise, bring a laptop. It doesn't really matter what kind, just so long as it has USB ports and can access the internet via WIFI. Peace Corps says they don't require you to have one, but you will find you need one. ALSO, do bring a few flash drives and an external harddrive. If you feel really proactive, you might want to look up on the internets how to rip your and your friends' DVD collections to your new external HDD. You're new friends will love you.
Also, as far as getting gear goes, do look at The Clymb (you'll need a member invite ---> http://vnlink.co/SHoWlBC
). The gear they have is all discounted and varies by day, although a lot of it is last year's styles. I saved a bunch of money using the Clymb.
SmithNB21 is right about pro deals. There are tons of companies that do deals of PCVs, and even if you don't know if a company does, just contact them and ask. Many of them will be open to the idea, and the worst they could do is say no...