| Size | Cost | $/Watt | Annual savings | Payback |
|---|---|---|---|---|
| 5 kW | $12,000 | $2.40/W | $883/yr | 9.5 yrs |
| 6 kW | $14,400 | $2.40/W | $1,060/yr | 9.5 yrs |
| 7 kW | $16,800 | $2.40/W | $1,237/yr | 9.5 yrs |
| 8 kW | $19,200 | $2.40/W | $1,414/yr | 9.5 yrs |
| 9 kW | $21,600 | $2.40/W | $1,590/yr | 9.5 yrs |
| 10 kW | $24,000 | $2.40/W | $1,767/yr | 9.5 yrs |
| 12 kW | $28,800 | $2.40/W | $2,121/yr | 9.5 yrs |
| 14 kW | $33,600 | $2.40/W | $2,474/yr | 9.5 yrs |