There are a few different ways to solar charge an electric bicycle but this is probably my favourite system; I can use one 48V panel through a custom regulator to go straight to a lithium ion battery or else I can use the same panel to charge a battery bank to store the energy and then use an inverter and the normal battery charger for the bike battery. I've made a short video to show how to do this and put it on youtube. You can also access it through my Solar Bike website - solarbike.com.au http://www.youtube.com/watch?v=Z5j9VyuWNzU