Understanding your solar power generation and savings

Share on Facebook0Tweet about this on TwitterShare on Google+0Share on LinkedIn0

A question often asked by those wanting to go solar or those who have already gone solar is, ‘How do I know if my plant is performing well?’ What’s the typical generation of a well performing rooftop solar power plant? How many units should it produce on an average?

The answers to the above questions are simple. The generation of your plant depends on a lot of factors- your location, irradiation in your area, panel orientation, component quality and the finally your system age. However, you can get a real time view of how your system is doing through a monitoring software linked to your system (by logging in). Let’s look at the typical generation for a plant in the Delhi- NCR area which has an annual average irradiation of 5.20 (kWh/m2/day).

The generation given below is representative of south facing panels (ideal for optimum generation). The components we have used are of high quality- (ReneSola panels, Delta inverters and mounting structures by Sunkalp). The ‘generation curve- cumulative’ of such plant would look somewhat like that shown below:

Generated units per day

Wherein major generation happens between 8 am and 5 pm (89% of the total). So this period is the time you should not consider shutting off your system in case you are looking at an off-grid system. If you’re a working professional and your system is a residential one, then net-metering is definitely an option you should look at considering you would be out of home in that time. Net-metering is a facility which allows you to export electricity to the grid when the generated electricity is not being used. What’s great is that they get adjusted in your bill and you pay only for what you consume from the grid.

If you’re a commercial/industrial consumer, almost all of the power generated from the solar power system would be used up in the day which would help in reducing your top slab bill (approx. INR 11.45/ unit).

Let’s look at a comparison between expected power output and actual power output on a good sunny day. Looking at the graph below, it can be said that between 11am and 1pm you can run 2 A.Cs completely on solar which in Delhi would result in savings of INR 125 /day. And effectively 3750/ month.

Generation curve- sunny hours v2

Your annual savings from solar looks as follows. On an average you save about INR 550 per month for a 10 KW system. You buy a system AND you get returns from the system! It’s an asset. For the rest of the energy sources, you have to keep paying for every unit consumed, leave alone getting any returns or savings.

Monthly savings

All the benefits listed above has encouraged people to take steps in going solar. If you think you’re ready to go solar as well, click to get a free proposal for Solar Power in Delhi-NCR.

Tanya Batra

Tanya keeps a close track of policy updates in the field of Rooftop Solar in India and likes to write blogs on its application for the end customer