Always invest in a kit that guarantees you with the ability to start generating electricity on installation
. Also investigate whether or not you are educated on the working of the solar cells and other fundamental components of this unit. The functions of the photons present in sunlight, electricity generation via electrons activated in the cells, power of a DC voltage, battery life, inversion and transformation of AC output and the amount of money that can be saved by using solar power in your home should all be explained in detail.
Depending on your budget you can either go in for the panel kits available in readymade versions or get one professionally installed by a technician. It does save you a lot when you can install the solar panel on your own. Overall the installation helps you not only save on electricity but also recover the initial cost of the kit the moment you supply the extra electric power at hand to the local grid!