Straight from Cabelas concerning the solar panel... this is on the IR 4 MP camera.

With 6.0-megapixel performance, the most of any Moultrie IR game camera, plus the stealth of an infrared flash, this full-featured unit will provide you with the highest quality images and scouting information available. Choose from three photo and two video resolution settings. A built-in 1.5" color viewer lets you scan your images in the field. All images are stamped with time, date, temperature, moon phase and barometric pressure. Six D-cell batteries (not included) provide up to 150 days of reliable operation. The optional Solar Panel Deluxe plugs into the external port and will keep a set of rechargeable D-cell batteries operating continuously at peak power. The infrared flash provides superior illumination in low light and darkness, without the game-spooking effects of a standard white flash. A generous 32MB of internal memory provides ample storage. Supports up to a 4GB SD card (sold separately) that provides additional storage capacity. Laser Aim lets you set and test the camera to determine the precise spot you want captured in your pictures. Includes a security option and a beacon locator with a remote control. Auto-Flash turns off in bright sunlight and automatically activates in low-light or after dark conditions. Also includes a built-in one-second delay, upgradeable software and an external power port. [/align]