Where the power shutdowns are frequent, the off-grid solar system with the batteries are ideally suited for such places as a replacement of the home inverter or the DG (Diesel Generator)
Since, the free solar energy is used for powering, we get substantial savings from the PV Solar System. The point to observe is that this is a recurring savings that we get each month and not a one time savings.
The investment on all other devices such as Home Inverter/ Diesel Generator leads to further recurring expenses due to use of electricity/Diesel for providing backup power.
The PV solar System gives double advantage: 01. It stops the recurring expenses incurred by the Home inverter or Diesel Generator. 02. It generates savings on the electricity cost by producing power from free solar energy.
As a case study we have taken a 3 KWp off-grid Solar System with the battery bank and calculated the cash outflow over a period of 25 years.
Here, we are trying to find the relative advantage of the PV solar system over the home inverter. Since, the battery will be required for both the systems we have ignored the cost of replacement of the batteries from the calculations.
As per the table the investment gets recovered by the 5th year and it starts generating savings from 6th year onwards. The total savings comes to Rs. 3,65,367/-
The larger the solar PV System, the larger will be the savings produced.
|Solar Investment||240000||Electricity Bill without solar||3000|
|solar Down Payment||72000||Electricity bill after Solar||750|
|EMI||168000||60||months||Savings from Solar||2250|
|EMI Rate/[email protected]%||2127||Grid Tariff increase/Yr||3%|
|Year||Down Payment on solar||EMI||Electricity Bill(after solar)||Total Outflow with solar(Rs.)||Elect.Savings with solar||Net Outflow/Inflow|