Instructables
Picture of Solar Electric Bike Charger
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I found these solar panels a few years back, but I was too excited to set them in motion to document all of the steps involved. They were most likey from a higher quality landscape lighting set, and when I find stuff like this at a yard sale it really makes my tail wag!
The basic idea is relatively simple. I used stainless steel screws with locking nuts (the kind with the nylon inserts) and mounted the panels to a metal shelving rail. I then wired them in series, with a nice sized diode between each one. These insure that the current flows in only one direction.  My bike uses a PRODECO 38.4V 9Ah battery, total charger output in full sunlight is 38 volts. PERFECT!

Looks like a great setup :)

Lectric Wizard10 months ago

"My bike uses a PRODECO 38.4V 9Ah battery, total charger output in full sunlight is 38 volts. PERFECT!" If your charging voltage is not higher than your battery voltage it will not fully charge.

you only need one diode in the output to prevent the battery discharging thru the solar cells, removing the rest may give you enough voltage for a full charge depending on the type of battery your charging.