| Cost item | values | Payback period/a |
| Investment per watt | 2.5 ¥/W | 10 |
| 1.5 ¥/W | 8 | |
| 0.5 ¥/W | 3 | |
| Percent of investment for O & M cost | 5% | 13 |
| 2.5% | 9 | |
| 1% | 8 | |
| Interest rate | 8% | 9 |
| 5% | 7 | |
| 2% | 7 | |
| Inflation rate | 6% | 7 |
| 3% | 8 | |
| 1% | 8 | |
| VAT and Additional tax | 0 | 7 |
| 6.89% | 8 | |
| 15% | 8 | |
| Income tax | 0 | 8 |
| 12.5% | 8 | |
| 25% | 8 | |
| Land price | 10 ¥/m2/a | 9 |
| 5 ¥/m2/a | 8 | |
| 1 ¥/m2/a | 8 |