Solar Blog

by Solar experts

solar energy plant installation

Discoms in almost all the states provide the Net Metering facility by which the consumers can store the excess energy generated from the roof top solar plant with the Discom Grid and can use it in later hours.

During the Sun hours, when the load (in KW) of the factory or the commercial building is less than the roof top solar generation for any 15-minute block interval, the excess solar energy goes back to the Grid. During evening hours when the load is more and there is hardly any solar generation, then the stored solar energy is used back by the consumer from the Grid.

The accounting of the roof top solar energy is done on a monthly basis. Read more

solar energy plant installation

Solar installmodular in nature and the factories, cold storages, warehouses, commercial buildings, Malls etc can plan to install solar panels (KW) as per their requirements.


To understand the solar plant sizing, let us assume a hypothetical case where in an industry located in Kundali, Sonipat (Haryana), and
  • has a roof made of metal shed and has an area of 3000sqmeters,
  • has a contract load of 1,500 KW,
  • has an average monthly electricity consumption of 70,000 units or kWh
  • is connected to a distribution transformer of 2,000KVA.

Following factors should be taken into consideration while designing the solar system for your roof -
  1. Roof Size determines the maximum capacity of the solar plant that can be installed:
    1. Each panel has an area size of roughly 2 sq meter (1 meter X 2 meter) with a capacity of around 325 watts. So broadly, 3 panels can make 1 KW of solar installation which implies 1 KW can be installed in 6 sq meter of roof areain ideal conditions.
    2. However, space is required to be left between the panel rows to avoid shadow on the panels. As the panel structures are raised to provide inclination and thus the better exposure to sunlight, Read more
solar energy plant installation

Apart from the solar panels, there are a number of components that make the solar system to be installed at factories and industries.

Solar Inverters are the most important component after the solar panels which need to be properly selected and installed for rooftop solar systems. Most industries in Delhi and NCR (Faridabad, Kundali, Panipat, Sonipat, Ghaziabad, Manesar, Noida, Neemrana etc) have opted for strong brand names for the inverters that would include ABB, Huawei, SMA, Delta, Waaree etc. The Inverters are available with a warranty of 5 years though the extended warranty of another 5 years can be available by paying a bit extra. Quality of Inverters matter significantly in generating higher power from the same level of solar generation provided by the Solar panels. More number of MPPTs (Maximum Power Point Tracker) generally help to increase the reliability of the solar system and provide better generation.

The structure for mounting the Solar Panels is an important part of the system. The strength of the structure should be such that they can bear a wind speed of 180 kms per hour. Typically, the structure should be designed and tested on the design software like STAAD.PRO to check their suitability for Read more

solar energy plant installation

In past, the solar systems used to be connected with the batteries that used to store the power before it was supplied to the machines and. Appliances. These solar systems were called as the off grid solar systems and were typically used as the backup for limited purposes.

However, with the technology break through and manifold increase in the reliability of electricity supply from the Discoms, the new age solar systems directly connect to the Discoms panel and Energy Meters via certain protections and relays. No batteries are required for these On Grid Solar systems as the much-required stability to match up the intermittent nature of solar power, is provided by the Discom power. Hence, the Discom acts as the large size battery for the On Grid Solar plants.

So, the solar works only when the power is available from Discom or from the DG sets.

These On-Grid systems generate power during sunny hours which are on average 1400 hours in an year in Delhi and NCR (Gurgaon, Faridabad, Ghaziabad, Noida etc) with few hours plus or minus. So out of 8760 hours in a year, the solar is available for around 16% of time assuming the full capacity of the Read more

solar energy plant installation

Many industries in Delhi/NCR (Kundali, Sonipat, Faridabad, Bahudargarh, Manesar, Bawal, Ghaziabad, Greater Noida etc) have to still depend on the Diesel Generator sets for running factories for few hours daily. What happens if the discom supply is disrupted during the sunny hours when the sun is still out generating the power?

Grid tied solar plants or On-grid solar systems will run when the Discom power is available as the solar inverters have in built feature which commands the solar system to generate power when it can sense that the supply is available from other sources. Such a feature is built in solar inverters as the solar power is an intermittent source of electricity supply which provides variable output depending on the solar intensity at that moment. Hence if suddenly the clouds cover the sun, the solar generation will dip making the system unstable.

Therefore, solar has to always run in conjunction with any other dependable and stable source of supply like Discom power, DG power or the batteries.

As the batteries are quite expensive and need to be replaced periodically, most factories depend on the DGs for the back up power. Solar can be connected to the DG panel directly as it Read more

solar energy plant installation

The industries should opt for rooftop solar today as there are a number of commercial advantages apart from environmental benefits. Industries can opt for solar system size ranging from few KWs to few MWs.

Typically, an on grid solar system is preferable which directly connects to the LT panel of the Discom Meter.

  • Power generated from solar will directly reduce the electricity bill.
  • Any surplus power generated at any time will be fed back to the Grid and stored with the Discom.
  • These solar plants run through Net Metering facility provided by the Discom in which the billing and settlement happens at the end of each month. Any surplus power generated from solar plant will be carried forward to the next month. However, if there is any solar plant left unused at the end of the financial year, it will typically lapse.
  • Having said that there are very slim chances that the solar power will lapse as the power generated from solar plant will not be more than 30% of the electricity bill for any industry.

As the solar system directly connects to the LT panel, the solar power gets used to run all the heavy machineries, air Read more
solar energy plant installation

Factories in Delhi and NCR regions have a variety of roofs ranging from flat concrete roofs, metal sheds which are mostly inclined and even the asbestos sheets laid over the top.

The Solar Plant can be installed on any roof that has sufficient strength.

On flat concrete roofs, it is quite easy to lay the solar panels. The civil foundations need to be laid in a way that the water should not seep into the roof. Over the foundations, the structure made up of hot dipped galvanized steel needs to be built of sufficient strength. The structure should preferably give a tilt of 20 degree around in Delhi and NCR to get the best solar irradiation. The panels should face to the South side to the extent possible.

The Metal sheds can be facing east-west or north-south. If the metal structure has sufficient strength, the solar panels can be easily laid. The solar panel structure should be such that it is light and strong enough to hold panels. In typical sheds, the purlins and associated structures are designed to take weights of more than 100 kg per square meter. Solar plant will weight around 20-25 kgs per square meter, hence the Read more