I've not had as good luck with the Lifetime Solar Elite models as I have with just the Lifetime Elite (non-solar) AA battery powered version. I currently have 1 Solar Elite and 3 standard Elites. The solar panel just isn't large enough and gets coated with corn dust so it doesn't quite keep the (tiny) gel cell battery charged very well. Then, if you need to replace the battery, it is a tiny size gel cell that's hard to find unless you go to a Batteries Plus store. If you use lithium batteries, I've found the standard Lifetime Elite will run for over a year before needing battery replacement. Since they both use the same funnel, all you have to do to replace yours is loosen the set screws holding the unit to the funnel post, slide it off and slide the new unit in its place.
I like the On Time Elite very well!