Is it worth it to install a residential or commercial solar system? Do the benefits of solar panels outweigh the installation and maintenance costs?
This tool may help you make the financial calculations required to determine the feasibility of a small solar PV plant.
NOTES:* Denotes a recommended value Numbers in brackets are negative
1
2
3
4
PV Plant
Solar energy is not always produced at the time energy is needed most. Will you utilize all the energy produced by your solar system? If not, what percentage of the generated solar electricity will be used?
%
This ratio is a measure of how efficiently a solar plant is operating. It represents the percentage relationship between the actual energy output of the plant and the maximum energy it could potentially produce at nominal conditions.
%
Solar panels will produce less energy with time. The degradation is higher on the first year when the panels are first exposed to sunlight compared to subsequent years.
%
%
It is the percentage of the time the solar system is available to supply energy. The availability of a solar plant is mostly a factor of its reliability and the periodic maintenance it requires.
%
It is widely accepted that the value of money today is greater than its value in the future. This means that money received at a later time is not as valuable as the same amount received today. This concept is not related to inflation, hence even if inflation is zero, we would still prefer to receive money today than the same amount of money after some time. This is primarily because we can put the money to use today in various ways such as learning a new skill, purchasing a laptop for work, or investing the money to watch it grow.
This tool helps in calculating the present value of future cash flows. The discount rate determines the value of future benefits; a higher discount rate implies that the value of benefits decreases with time. Simply speaking, you may use the interest rate offered by commercial banks on deposits as the discount rate. If you don't want to discount future cash flows, you can set the discount rate to zero.
%
Energy Price
Construction & Operation Costs
%
%
Expected Average Annual Inflation
%
%
%
Loan Details
%
%
Results
PV Plant
kWh
Estimated specific energy yield
Nominal yield
Expected output in year 1
Expected output in year
Total produced energy
Total utilized solar energy
Approximate total area in m²
Energy Price
In year 1
In year 10
In year 15
In year 25
In year 30
Cost of Ownership
PV plant cost
First year maintenance cost
Maintenance cost over years
First year insurance cost
Insurance cost over years
Annual loan payment
Total loan payments
Investment Summary
Invested money
Loan
Interest
Opex
Nominal Revenues
Total savings ()
Total cost ()
Net savings in ()
Payback period in years
Discounted Revenues
Total discounted savings ()
Total discounted costs ()
Net present savings ()
Discounted payback period in years
IRR (NPV= 0)
Equivalent annual annuity ()
Should I Just Save My Money?
Invested money
Saving account after years Assuming an interest rate equivalent to the discount rate
Investment Summary
Cumulative Cash Flow ()
Cumulative Discounted Cash Flow ()
Year
Efficiency
Energy Cost ()
Yearly Output (kWh)
Y. Utilized Energy (kWh)
Yearly Savings ()
Loan Repayment ()
Maintenance ()
Insurance ()
Yearly Cost ()
Cash Flow ()
Cumulative CF ()
Discounted Savings ()
Discounted Cost ()
Discounted CF ()
Cumulative DCF ()
Account CCF ()
Nominal Interest ()
Input
PV Plant
PV plant (kWp)
Annual irradiation (kWh/m²)
Usability of PV power*
Performance ratio*
First year degradation*
Annual degradation*
PV plant lifetime in years*
Availability factor*
Recommended area per kW (m²)*
Discount rate
Energy Price
Currency
Electricity price (USD/ kWh)
Construction & Operation Costs
Construction cost (USD/ kWp)
Maintenance cost (% of system cost)*
Insurance cost (% of system cost)
Loan Details
Loan period in years
Borrowing interest rate (%)
Percentage of down payment
Expected Average Annual Inflation
Rate of increase in energy prices
Rate of increase in maintenance cost
Rate of increase in insurance cost
Output
PV Plant
kWh
Estimated specific energy yield
Nominal yield
Expected output in year 1
Expected output in year
Total produced energy
Total utilized solar energy
Approximate total area in m²
Energy Price
USD
In year 1
In year 10
In year 15
In year 25
In year 30
Cost of Ownership
USD
PV plant cost
First year maintenance cost
Maintenance cost over years
First year insurance cost
Insurance cost over years
Annual loan payment
Total loan payments
Investment Summary
USD
Invested money
Loan
Interest
Opex
Nominal Revenues
USD
Total savings ()
Total cost ()
Net savings in ()
Payback period in years
Discounted Revenues
USD
Total discounted savings ()
Total discounted costs ()
Net present savings ()
Discounted payback period in years
IRR (NPV= 0)
Equivalent annual annuity ()
Should I Just Save My Money?
USD
Invested money
Saving account after years
Assuming an interest rate equivalent to the discount rate