What's wrong with something like this?
It seems reasonably priced and a large majority of the reviews of the individual components are 5 star.
Free shipping and no sales tax. $3250 federal tax break. $500 a year for 7 years SC state tax break. Making a real cost of $4000 before any grid savings. With an average monthly electric bill of $150 this package would pay for itself in 2 years.