Hey there, @Paul_B! Our Spotlight Camera Solar will indeed connect via the included barrel connection cable. If you have the Spotlight Cam Battery, this is the same connection and will certainly work with our Solar Panel accessory. Keep in mind, the Spotlight Camera Battery comes uses a quick release battery, which is intended to be taken out and charged with the included, usb cable.
Using a power outlet to power the Spotlight Camera is only intended for our Spotlight Camera Wired model. I hope this helps! 