I have a 24' piece of rope lighting and 2-12' pieces, are the 24' and the 12' connectable? The 2-12' pieces are.

If they are, it would be mentioned in the manufacturers instructions.

Is this what you have?

Can go up to 200 feet.

Buy a Hampton Bay 18 Ft. LED Rope Light Kit Specialty Lighting from The Home Depot (http://www.homedepot.com/buy/lighting-fans/specialty-lighting/hampton-bay/18-ft-led-rope-light-kit-76320.html)

You can link this type of rope up to 200' so you should be good to go.