Frequently Asked Questions

FAQ (Basics of Solar PV System)

1What is the gross potential of solar power in the country?
India is endowed with vast solar energy potential. About 5,000 trillion kWh per year energy is incident over India’s land area with most parts receiving 3-5 kWh per sq. m per day. Based upon the availability of land and solar radiation, the potential of solar power in the country has been assessed to be 750 GWp.
2Does a Solar PV system produce same energy output throughout the day?
Since Solar PV works on the basis of the intensity of sunlight it gets, your solar system typically wakes up at around 6am in the morning and goes to sleep at about 6 or 7pm in the evening. The energy output increases gradually and peaks at around noon and then gradually decreases as the Sun starts setting. But since the solar energy produced integrates either with your existing electrical connection or with your batteries, the running of your electrical equipment is not impacted. Moreover, if your Solar PV system is designed well, all your electrical equipment is totally safe.
3What is the unit of electricity?
Electricity is measured in kWh (Kilo Watt Hour). It is the amount of electricity consumed by an appliance in a specified period. For example, 100W bulb * running for 1 hour = 100Wh which is equal to 0.1 kWh (unit). Your electricity bill mentions the kWh (Units) consumed by you in your billing cycle.
4What are the key factors that affect solar power generation?
To ensure that the generation from your Solar PV system is maximized, the following should be kept in mind:
  • Location (Solar Irradiation/ weather conditions)
  • Plant layout
  • Shading and roof orientation
  • System design
  • Equipment quality
  • Operations and maintenance
5What is a Solar Rooftop System?
In a solar rooftop system, the solar panels are installed in the roof of any residential, commercial, institutional and industrial buildings. This can be of two types (i) Solar Rooftop System with storage facility using battery, and (ii) Grid Connected Solar Rooftop System.
6What is a Solar Rooftop System with Storage facility?
Such rooftop system has battery as storage facility. The solar electricity is stored in the battery and can be utilized during night also when the sun is not available.
7What are the other fiscal incentives are available for Solar Rooftop Systems?
There are provisions of concessional import duty/excise duty exemption, accelerated depreciation and tax holiday for setting up of grid connected rooftop power plants.
8What efforts Government is making to providing loans for solar rooftop systems?
Department of Financial services has instructed to all Public Sector Banks to encourage home loan/ home improvement loan seekers to install rooftop solar PV plants and include cost of system in their home loan proposals. So far, nine PSBs namely Bank of India, Syndicate Bank, State Bank of India, Dena Bank , Central Bank of India, Punjab National Bank, Allahabad Bank, Indian Bank and Indian Overseas Bank have given instructions to extend loan for Grid Interactive Rooftop Solar PV Plants as home loan/ home improvement loan.


1What is a grid connect solar power system?
Grid connect systems, often located in built up areas, supply solar electricity through an inverter directly to the household and to the electricity grid if the system is providing more energy than the house needs. When power is supplied to the mains grid, the home owner usually receives a credit or a payment for that electricity. This is called a feed in tariff.
2What can affect the amount of solar energy received?
The strength of the solar energy (radiation) available depends on the time of year, the time of day, and the latitude of the generation point. The amount of energy generated can be further affected by the amount of dust and water vapour in the air, the amount of cloud cover and any shading of the solar panels and the quality of the solar modules.
3Does roof orientation really matter?
Most certainly. Our country India, lies in the southern hemisphere so when the sun travels, it takes an elliptical trajectory going from east to west having an inclination towards south ,hence to get the maximum quantity of solar energy we have to place our panel accordingly. Be it summer or winter, the inclination is towards south.
4How much does a grid connect solar power setup cost?
Prices vary according to size and location – try our quick solar quote tool to determine the cost.
5Is my building suitable for a solar power system?
Several aspects will need to be evaluated to determine if your home is a good solar site, such as orientation, space available, shadows on the space available and your current electricity usage. The best site will be one with adequate south-facing roofs that have no shade. Variations on that will cut into the productivity of the system.
6How long will my grid connect solar power system last?
The life of Solar modules that have been tested in the field showing small reductions in power output after 20 years, mostly because the glass surface becomes a bit dull and reflects more light. All our solar panels carry an output warranty of 25 years. The electronic components such as inverters, being the most sensitive, will last 10 -15 years.
7What type of warranty is supplied with the system?
Solar Panels: minimum 10 year product warranty and 25 year performance guarantee Inverter: 5 – 10 year warranty. Mounting System: 10-year product warranty (manufacturer) Workmanship: 5 year warranty on workmanship (installer)
8Should I choose monocrystalline, thin film or polycrystalline solar panels?
Between monocrystalline and polycrystalline there isn’t a lot of difference except that a polycrystalline panel is slightly larger than the equivalent wattage in monocrystalline. Thin film panels are larger again and the extra space can take up valuable rooftop real estate in terms of adding extra panels at a later date.
9What can affect the costs of installing a grid connect system?
A base installation rate includes the grid connect system being installed on a pitched metal roof facing south with appropriate surface area available. Additional costs will be incurred for a flat or tiled roof; any equipment upgrades and extended warranties.
10If my energy requirements increase, can I upgrade the system?
Yes. Additional solar panels can be added at any time to increase generating capability but you might have to upgrade to a larger inverter. Alternatively you could purchase a larger inverter when installing the system initially and then plan to add some extra solar panels later.
11What happens on cloudy days?
In a grid connect system, as you are still tied to the mains power supply, any deficit will come from the mains grid.
12How reliable will my system be?
As the iGlow Green Energy systems are designed to Indian Standards, the reliability of components and consistency of power supply will be more than adequate for the loads specified.

Solar power system components

1What does a typical home solar system consist of?
The heart of a photovoltaic solar system is the solar array. Made up of multiple panels (individually measuring roughly 1 by 1.5 meters), this array absorbs the energy of a specific range of available sunlight and converts this energy into electrical energy. The array is mounted on a frame that allows the panels to be securely mounted with minimal interference with the waterproofing and structure of the roof, as well as providing the correct aspect and elevation for the array so as that the maximum amount of available sunlight in received and converted. A cable is run down from the array to the inverter, a device designed to efficiently convert the widely fluctuating power from the solar array into a predictable and usable energy feed. A second cable connects the inverter to your house’s switchboard, which is in turn connected to the main power grid, creating a continuous and dynamic system for the contribution of solar energy to your house. The inverter also acts as a simple data logger; an information screen on the inverter will display total energy production, daily energy production, and instantaneous power. These figures will fluctuate depending on the time of year, the cloud cover, and temperature, and will allow you to keep a record of your system’s performance. Solar power systems can also be optionally fitted with easy-to-use remote monitors, internet enabled data loggers, and even sensors to determine solar availability, panel temperature, air temperature, and wind speed. Ask your sales representative for more information.
2Is there any maintenance involved?
With an grid connected system, there is very little maintenance required. Electronic components should be maintenance free. iGlow Green Energy systems come with complete instructions for maintenance.

Electrical & installation solar power FAQ

1Is a solar regulator necessary in a grid connect system?
No, the inverter handles the incoming charge and converts it to AC electricity for use in your home. Solar regulators are used in off-grid systems.
2Will I need a new switchboard and/or meter?
In order to install a grid connected solar power system at your premises, you will need to have a compatible switchboard and meter. A meter exchange may be required after the installation of your new solar system. The energy produced by your solar system interacts with the main power grid and the loads in your house. Without an appropriate mains meter, any energy you sell to the power grid can be inaccurately measured, or even completely disregarded, greatly reducing the system’s effectiveness in reducing your energy bill. A ‘bi-directional’ meter is installed in place of the existing one-way ‘detented’ meter, allowing the reading of energy in both directions; both buy and sell.
3How does electricity get stored for use after the sun goes down?
Grid connect systems direct excess electricity produced during the day back into the local electricity grid. You then receive a credit for any power that your system supplied to the grid. During the night when your system does not produce and electricity you draw your power from the grid and your electricity meter measures your consumption.
4What happens with grid connect systems during a blackout?
The grid connect inverter will automatically shut itself off within a few milliseconds of a blackout, to avoid the potential of a dangerous “brown-out” in your home and to prevent back feeding into the grid. Therefore even though you have a solar system during a blackout you will not have power available. If you want to keep on having electricity available during a blackout then you would need to have back up batteries installed as well, which will add to the cost of the system.
5Can you retro-fit battery backup into a grid connect system?
Yes, battery backup systems require additional components – which can be costly; although pricing is rapidly dropping.
6How does a solar system connect into current house power?
The solar system is wired into your existing fuse box via a 15amp circuit breaker.
7Where do you place the inverter?
Usually the inverter is placed alongside the fuse box. The inverter is silent and has a display to show the electricity generated and other data options such as total electricity generated since installation, are available.
8What is the difference between solar power and solar hot water?
Solar panels take light from the sun and make electricity. Solar hot water systems take heat from the sun and heat water. It is easy to remember: Heat from the sun heats the water. Light from the sun turns on the lights.
9How much roof space is needed?
1.0 KW system needs approximately 10m2, a 1.5KW system needs approximately 15m2 and so forth.
10What is the weight of the solar system on the roof?
The system weighs approximately 27 kilograms per square meter (a 1KW system is approximately 10 square meters).

FAQs for Maintenance

1What do I need to do to maintain the system in good condition?
You don’t need to do much to maintain the system in good condition. The solar system uses Photovoltaic (PV) cells, which are very robust and low-maintenance. We recommend a monthly cleaning of the panels.

FAQs for Finance

1What do I need to do to maintain the system in good condition?
You don’t need to do much to maintain the system in good condition. The solar system uses Photovoltaic (PV) cells, which are very robust and low-maintenance. We recommend a monthly cleaning of the panels.
2What is Solar PPA?
Solar PV Power Purchase Agreement (PPA) allows user to enjoy the benefits of using Solar energy without having to bear the upfront investment. This option is suitable for heavy Commercial and Industrial Consumers, with Solar Project size of 100 kWp or above. A typical PPA is executed for a term of 20 to 25 years, during which the system is Owned and Operated by the Project Developer (Investor), allowing the User (Owner) to pay monthly bills based upon their consumption at lower rate than Grid supplied electricity; typically 25% to 35% lesser. This results in instant savings, from Day 1 of Solar commissioning, and without worrying about the higher investments. The PPA Rate is pre-agreed for the entire duration of the PPA, and thus provides certainty and relief from frequently rising utility tariffs. Additionally, the Operation and Maintenance of the Solar Plant is taken care of by the project developer. The user has to qualify certain minimum criteria to avail this financing option. Solar Project of size less than 100 kWp may be considered only on case specific basis for PPA. For further information, do read more about solar PPA and how it works. Benefits of Solar PPA: • No Upfront investment to the owner (consumer) • Pre-agreed tariff’s are generally 15 to 30% lower than the grid power supply tariffs • Long term Savings against rising grid power supply tariffs • No operational and maintenance costs • Proposer utilization of unused roof area, reducing damage and wear and tear of your establishment • Option to buy the solar plant after few years of operation at a pre-agreed rate according to PPA contract