| Size | Cost | $/Watt | Annual savings | Payback |
|---|---|---|---|---|
| 5 kW | $13,000 | $2.60/W | $874/yr | 10.4 yrs |
| 6 kW | $15,600 | $2.60/W | $1,049/yr | 10.4 yrs |
| 7 kW | $18,200 | $2.60/W | $1,224/yr | 10.4 yrs |
| 8 kW | $20,800 | $2.60/W | $1,398/yr | 10.4 yrs |
| 9 kW | $23,400 | $2.60/W | $1,573/yr | 10.4 yrs |
| 10 kW | $26,000 | $2.60/W | $1,748/yr | 10.4 yrs |
| 12 kW | $31,200 | $2.60/W | $2,098/yr | 10.4 yrs |
| 14 kW | $36,400 | $2.60/W | $2,447/yr | 10.4 yrs |