As mentioned before, the "turnkey" solutions can be suspect and expensive. A system design is kinda like a triangle. Fire's triangle includes fuel, oxygen, heat; Solar/wind is based on production, storage, and usage. Depending upon what you plan to do, (off-grid) systems may include the following:

1) Production - solar or wind
2) Control - charge controller. Solar needs it, and most wind system have it built in.
3) Storage - batteries
4) Fuse - appropriately sized
5) Inverter (optional) - provided you need to bump it up to 120 or 240.

I've played around, and have a small hobby system. 20w panel, charge controller, 7ah battery, and (3) 3w led spotlights. The controller has the lights come on for 4 hours after dusk every night. Neat little project, and from this, the sky's the limit.