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Frequently Asked Questions

General FAQs
01.What is a Solar PV System and how does it work ?

PV, short for Photovoltaic, derives its name from the process of converting light (‘photo’) directly into electricity (‘voltaic’). Simply put, a Solar PV system is a power station that generates electricity from sunlight.

The main components of a Solar PV system are:

1. Solar Panels/Modules: Solar panels consist of a group of small cells made from semiconductor material. When the sun’s light falls on the modules, it excites the electrons, thereby creating direct current (DC).

2. Storage Battery: The best use of solar energy is to consume it while it is being generated. If the requirement is to store this power and consume it in the non-sunny hours, then solar energy can be stored in batteries for later consumption.

3. Solar Inverter: The DC electricity goes into an inverter that converts it into alternating current (AC). We use AC for running our household or office or factory equipment.

02.What factors are important to consider when planning to go solar ?

If you planning to install a solar plant, below are some things to consider:

  • What are your energy demands? How do you consume the power ?
  • What is the availability of the shadow-free area on your rooftop or building premises ?
  • What is the buying option you find more commercially viable (CAPEX or RESCO) ?
  • What would be the savings if you go solar ?
03.How much is the average life of the solar panels?

Most panel manufacturers give warranty of 25 years, however, there have been plants in operations for 40 years as well.

04.Which Solar PV system is suitable for your project?

There are various factors involved in choosing your PV system. You might want to research on them before choosing the apt model:

  • - Energy Consumption Pattern
  • – Power Cuts or outages
  • – Various Govt. Policies like Net Metering, Grid Power Access or subsidies on Solar power.
01.What are the buying options in the solar market ?

There are two main buying options available in the market:-

OPEX Model – In this, a third-party investor owns the solar plant. The consumer and the producer enter into a PPA (power purchase agreement) for a decided duration of time which is typically 15-25 years. During the tenure of PPA, the consumer pays the producer for the power generated at a decided tariff. After the PPA terminates, the solar plant is transferred to the consumer.

CAPEX model – In this, end consumer owns the solar plant by purchasing it upfront and can avail various financing options like bank loans to finance the solar plant.

02.What is net metering ?

Net Metering is a policy which allows you to sell excess solar power generated back to the grid ensuring maximum savings from the solar plant

03.How much does a Solar PV system cost ?

Below are the approximate costs for a 100KW set up:

  • Rs. 65-75 lacs for the household sector
  • Rs. 55-65 lacs for larger commercial & industrial sector
  • Utility-scale is even cheaper owing to economies of scale
04.Is Solar Power cheaper than the grid and diesel power ?

Solar power is much cheaper than the power from grid and diesel generators. Today average cost of power from solar is Rs. 4.5-5 per kWh (For commercial and Industrial segments) while the average cost of power from the grid is Rs. 7 per kWh and Rs 16 per kWh from a diesel generator. (A litre of diesel generates around 3-4 kWh).

05.How will I save from Rooftop Solar plant ?

In OPEX model with no initial capital investment from the client, systems start paying for itself immediately as solar Tariff is way lesser than your current cost of power from Distribution Company and Diesel Generator Backup set. And as the gap between solar tariff and the grid tariff increase over the years; the savings also increase.

Installation & Maintenance
01.How much time does it take to install a Solar PV system ?

It can range between 2-10 weeks depending on the complexity of the project.

02.Is my rooftop right for Solar plant ?

If your roof is not having any shade from adjacent buildings, trees etc and its structure is not delicate then your roof is suitable for installation of solar plant.

03.What would be the annual maintenance cost involved for a solar PV system ?

The annual maintenance cost is not very significant as the system only requires cleaning of modules (every 2-3 weeks) and basic preventive and corrective electrical maintenance (every 3 months) Water is generally used to clean the panels

04.How much area is required to install a rooftop solar system ?

This would depend on various factors such as the shadow-free area available, the orientation of the roof etc, however, as a thumb rule, we can assume 1KW plant requires 12 sq meters of shade-free area.

01.How do I know that the solar setup is working efficiently ?

It is advisable to install an energy monitoring system along with your solar plant that will allow you to compare the actual with the estimated performance on daily, monthly and annual basis.

02.What are the key factors that affect solar power generation ?

Following factors should be kept in mind:-

  • Location and layout of the solar plant.
  • Roof Orientation and shade-free area.
  • Quality of equipment
  • Design of the solar plant.
  • Maintenance of the plant.
03.How much energy will be generated from a 1 KW solar plant ?

On an average, every 1 KW setup produces 1300 to 1500 units in a year. This may, however, vary based upon the location of the plant, seasonal factors, surroundings and shadow-free area available. You can consider 1400 units for sake of calculations.

04.Does rain affect the performance of solar plant?

The electricity generation of the plant suffers during rainy and cloudy days especially during the monsoon season, but the generation never drops to zero. The loss of generation during monsoon and other rains is already adjusted in the 1.3 to 1.5 Lakhs unit/100kWp/annum generation number.

05.Can I use solar energy only for certain loads ?

No, Solar energy is integrated into the LT panel of consumer premises, wherein DG, Grid or other generator sources would be feeding power as of now. When solar energy is injected, the equipment is unaware of the source from which power is feeding in. Hence it is not possible to segregate the loads on basis of the power source.

06.Will a Solar plant meet 100% of my power requirement ?

Technically yes, a solar plant can meet your entire power requirement if it is backed by battery energy storage system (BESS). But practically, for commercial and industrial users where the power requirement is higher, it would be recommended to use solar in sync with the grid. When in sync, priority is automatically given to the solar power to be consumed first.

07.Will my plant generate during the night?

The Solar plant will generate electricity only during the Sunny hours, typically between 6.30 A.M. to 5.30 P.M and will not generate any electricity during the night.