We actually worked out a solar power arrangement as a project for Jeff Feddersen’s Sustainable Energy course when we were in graduate school. The documentation for Solar Botanicalls is on my blog. As for WiFi, it’s been considered of course but the hurdle is building in an interface for configuring the SSID and security information needed to join the network. It would also probably double the price of the kit, which wasn’t something we wanted to do on the first round. But yes, we’re still interested and discussing possible solutions.