It is often difficult to understand the complete financial working of solar thermal systems. Table below explains the same in great detail:
Size of System(Liters per day) |
100 LPD |
150 LPD |
200 LPD |
300 LPD |
500 LPD |
1000 LPD |
System price(Rs.) |
17,270 |
22,550 |
28,670 |
39,350 |
79,360 |
1,48,390 |
Expected savings(Units/year) |
1,000 |
1,500 |
2,000 |
3,000 |
5,000 |
10,000 |
Savings (Rs./year) |
10,000 |
15,000 |
20,000 |
30,000 |
50,000 |
1,00,000 |
Payback |
1.7 years |
1.5 years |
1.43 years |
1.3 Years |
1.58 years |
1.48 years |
Key Assumptions
- Electricity tariff: Rs. 10/kWh
- System lifetime of 10 years
- Sunny days in north Indian taken as 200 days per year as per MNRE table below:
Region |
Northern Region |
Eastern Region |
Southern Region |
Western Region |
Sunny days(Days/year) |
200 |
200 |
300 |
250 |
Expected savings(Units/year/100 LPD) |
1000 |
1000 |
1500 |
1250 |
Savings(Rs./year/100 LPD) |
10,000 |
10,000 |
15,000 |
12,500 |
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