Measures total profit as a percentage of your initial investment over 25 years.
ROI = (Total Savings / Investment) × 100
Higher ROI means better returns. Compare with FD returns (~6-7%).
224.8%Annual return rate that makes your investment worthwhile, accounting for money's time value.
Σ(Cash Flow / (1+IRR)^year) = 0
IRR > 12% is considered excellent. Helps compare with other investment options.
12.3%Time needed to recover your initial investment through electricity bill savings.
Payback = Investment / Annual Savings
Shorter payback is better. After this period, you're essentially getting free electricity!
7.7 yrs🌱 Carbon Impact
💳 Loan Option (10 yrs @ 6%)
Measures total profit as a percentage of your initial investment over 25 years.
ROI = (Total Savings / Investment) × 100
Higher ROI means better returns. Compare with FD returns (~6-7%).
169.6%Annual return rate that makes your investment worthwhile, accounting for money's time value.
Σ(Cash Flow / (1+IRR)^year) = 0
IRR > 12% is considered excellent. Helps compare with other investment options.
9.7%Time needed to recover your initial investment through electricity bill savings.
Payback = Investment / Annual Savings
Shorter payback is better. After this period, you're essentially getting free electricity!
9.3 yrs🌱 Carbon Impact
💳 Loan Option (10 yrs @ 6%)
Measures total profit as a percentage of your initial investment over 25 years.
ROI = (Total Savings / Investment) × 100
Higher ROI means better returns. Compare with FD returns (~6-7%).
108.7%Annual return rate that makes your investment worthwhile, accounting for money's time value.
Σ(Cash Flow / (1+IRR)^year) = 0
IRR > 12% is considered excellent. Helps compare with other investment options.
6.7%Time needed to recover your initial investment through electricity bill savings.
Payback = Investment / Annual Savings
Shorter payback is better. After this period, you're essentially getting free electricity!
12.0 yrs🌱 Carbon Impact
💳 Loan Option (10 yrs @ 6%)
kWh/kW/day
Bill Type
Tamil Nadu (Domestic)
years
Billing Cycle
Bimonthly
Grid Emission Factor
0.75 kg CO₂/unit
years @ 6% p.a.
Net Metering Charge
₹100/kW/cycle