| Size | Cost | $/Watt | Annual savings | Payback |
|---|---|---|---|---|
| 5 kW | $13,000 | $2.60/W | $884/yr | 10.3 yrs |
| 6 kW | $15,600 | $2.60/W | $1,061/yr | 10.3 yrs |
| 7 kW | $18,200 | $2.60/W | $1,238/yr | 10.3 yrs |
| 8 kW | $20,800 | $2.60/W | $1,415/yr | 10.3 yrs |
| 9 kW | $23,400 | $2.60/W | $1,591/yr | 10.3 yrs |
| 10 kW | $26,000 | $2.60/W | $1,768/yr | 10.3 yrs |
| 12 kW | $31,200 | $2.60/W | $2,122/yr | 10.3 yrs |
| 14 kW | $36,400 | $2.60/W | $2,475/yr | 10.3 yrs |