| Size | Cost | $/Watt | Annual savings | Payback |
|---|---|---|---|---|
| 5 kW | $12,900 | $2.58/W | $825/yr | 10.9 yrs |
| 6 kW | $15,480 | $2.58/W | $990/yr | 10.9 yrs |
| 7 kW | $18,060 | $2.58/W | $1,155/yr | 10.9 yrs |
| 8 kW | $20,640 | $2.58/W | $1,320/yr | 10.9 yrs |
| 9 kW | $23,220 | $2.58/W | $1,485/yr | 10.9 yrs |
| 10 kW | $25,800 | $2.58/W | $1,650/yr | 10.9 yrs |
| 12 kW | $30,960 | $2.58/W | $1,980/yr | 10.9 yrs |
| 14 kW | $36,120 | $2.58/W | $2,310/yr | 10.9 yrs |