solar power system design

Im looking for a design for a grid tie solar system, with a hybrid grid tie inverter (12+ kw output 60 hz split phase 230v, us power grid) with full off grid capability, that can use lithium or lead acid battery's, 15 kw of solar panels. A diesel generator will also be added at a later date, a auto transfer switch will be needed for the house as the system must be installed in the machine shed where the solar panels will be roof mounted, there is 2300 sqft of south facing roof on a 2/12 pitch, pro rib steel roof. With engineered wood trusses and 2x8 book shelf framed walls.