Solar panel mount for Spider Rover

I used a gear motor 1:50 which is not the fastest solution to drive an already worm gear driven mechanic. However through the lower power consumption the solar cells rated 9V&109mA each (full sunshine) have no problem to keep it moving.
I have connected the cells in series. The motor is 12 volt and takes about ~70-95 mA. I have not tried to connect the cells in parallel sofar but it already works good enough. Maybe lower gear ratio and connection in parallel would give it some more speed.