I started down the road of building a home brew solar system for my Cuddelinks, but I couldn't really justify it because Cuddelink is selling solar panel kits with rechargeable batteries for $49.99. Making one myself would be pretty close to that, plus a giant case with a battery sitting on the ground at the base of my tree instead of the sleek panel-only system Cuddelink offers.
I'm also excited about the dual-power bank system they are releasing this summer as it will connect to their solar panel system for (hopefully) 9 months to a year of power. So far my solar panels have over a month on them and are hanging in there. I wanted to test them in the winter months to see how they will perform this coming season.
I have my home unit plugged into wall power and have a WiFi SD card in it setup and running as of today.
I also have two cameras in the field that are running off a home brew solar setup. Each camera has 12 AA energizer rechargeable batteries with the solar panel connected to it. Each solar panel has a 12v rechargeable battery in a plastic electrical box mounted to the back of the solar panel. I am also using a voltage regulator. I am using the same setup the handy hunter did a YouTube walkthrough on.
The solar panels have only been up for two weeks, but so far so good. One is in full sun and one is in partial sun. Time will tell how each one does.
Also have two more cameras that just have standard alkaline batteries.
That's the same system I've been running. It worked great until there was a good canopy of leaves. Cameras that were on the edges of fields getting good sunlight ran forever but anything in the woods wasn't getting enough charge from solar to make a difference so I unplugged and took off the panels and just used the external battery as a backup.
There's a great 86 page thread about Cuddelink cameras on Habitat Talk. Pretty much any question you would have has been answered.
http://habitat-talk.com/index.php?threads/cuddebacks-cuddelink.7859/