[MrForbes]

Huh....tell us about how long the robot has to get power, and how long it can sit in the sun in standby mode recharging.

A solar panel that size will give you about 5 amps to charge a 12v battery, or about 2.5 amps to charge a 24v battery pack.

This is based on my experience with a solar powered underwater robot, which operates on 48v (four 12v 7ah batteries in series) at a max of 5 amps. We spend a couple hours charging it, then we can run it for about an hour. We have the battery box set up with switches to parallel the batteries for charging, and connect them in series to run the robot. Charging and running do not happen at the same time (since the robot was built for a night competition)