If it is only for irrigation of anything not grass, why not use off the grid system like blumats (http://blumat.com/en/ http://blumat.com/en/)? You only need to

If it is only for irrigation of anything not grass, why not use off the grid system like blumats (http://blumat.com/en/ http://blumat.com/en/)? You only need to provide it with a water source.