I agree with dstubb about the solar panel being close to the spinner, I went to this style with the externally mounted solar panelabout 9 years ago and they have proven to work well..
I would also agree with njbuck22 that you want a feeder that will spin the feed out as far as possible, I personally use 12 vilt systems with special spinner plates that throw the feed in a 60' circle. Deer don't like to go under the feeder but if you can get one that will throw the feed out farther you will have a lot more deer coming to it...Good luck