| 年份 | 投资支出 (初投资 + 电池更换) | 其他支出 (安装费 + 年管理费) | 收入 (产热水 + 发电) | 净现金流量 | 折现值 | 累积折现值 |
| 0 | 5978.0 | 269.0 |
| −6247.0 | −6247.0 | −6247.0 |
| 1 |
| 30.0 | 981.7 | 951.7 | 865.2 | −5381.8 |
| 2 |
| 30.0 | 1011.2 | 981.2 | 810.9 | −4570.9 |
| 3 |
| 30.0 | 1041.5 | 1011.5 | 760.0 | −3811.0 |
| 4 |
| 30.0 | 1072.7 | 1042.7 | 712.2 | −3098.8 |
| 5 | 800.0 | 30.0 | 1104.9 | 274.9 | 170.7 | −2928.1 |
| 6 |
| 30.0 | 1138.1 | 1108.1 | 625.5 | −2302.6 |
| 7 |
| 30.0 | 1172.2 | 1142.2 | 586.1 | −1716.5 |
| 8 |
| 30.0 | 1207.4 | 1177.4 | 549.3 | −1167.2 |
| 9 |
| 30.0 | 1243.6 | 1213.6 | 514.7 | −652.5 |
| 10 | 800.0 | 30.0 | 1280.9 | 450.9 | 173.8 | −478.7 |
| 11 |
| 30.0 | 1319.3 | 1289.3 | 451.9 | −26.8 |
| 12 |
| 30.0 | 1358.9 | 1328.9 | 423.4 | 396.7 |
| 13 |
| 30.0 | 1399.7 | 1369.7 | 396.7 | 793.4 |
| 14 |
| 30.0 | 1441.7 | 1411.7 | 371.7 | 1165.2 |
| 15 | 800.0 | 30.0 | 1484.9 | 654.9 | 156.8 | 1321.9 |
| 16 |
| 30.0 | 1529.5 | 1499.5 | 326.3 | 1648.3 |
| 17 |
| 30.0 | 1575.4 | 1545.4 | 305.7 | 1954.0 |
| 18 |
| 30.0 | 1622.6 | 1592.6 | 286.4 | 2240.5 |
| 19 |
| 30.0 | 1671.3 | 1641.3 | 268.4 | 2508.8 |
| 20 |
| 30.0 | 1721.4 | 1691.4 | 251.4 | 2760.3 |