| Size | Cost | $/Watt | Annual savings | Payback |
|---|---|---|---|---|
| 5 kW | $13,750 | $2.75/W | $977/yr | 9.9 yrs |
| 6 kW | $16,500 | $2.75/W | $1,172/yr | 9.9 yrs |
| 7 kW | $19,250 | $2.75/W | $1,368/yr | 9.9 yrs |
| 8 kW | $22,000 | $2.75/W | $1,563/yr | 9.9 yrs |
| 9 kW | $24,750 | $2.75/W | $1,758/yr | 9.9 yrs |
| 10 kW | $27,500 | $2.75/W | $1,953/yr | 9.9 yrs |
| 12 kW | $33,000 | $2.75/W | $2,344/yr | 9.9 yrs |
| 14 kW | $38,500 | $2.75/W | $2,735/yr | 9.9 yrs |