Frequently Asked Questions

Does solar work when the grid supply is off in on grid 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. At the time of black out or when the electricity supply from the grid (i.e Electricity Board) is off the on-grid 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.

How does net meter work?

Net metering is a billing mechanism that credits solar energy system owners for the electricity they add to the grid. For example, if a residential customer has a PV system on the home’s rooftop, it may generate more electricity than the home uses during daylight hours. 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 Uni-Directional’ meter, allowing the reading of energy in both directions. If the home is net-metered, the electricity meter will run backwards to provide a credit against what electricity is consumed at night or other periods where the home’s electricity use exceeds the system’s output. Customers are only billed for their “net” energy use. On average, only 20-40% of a solar energy system’s output ever goes into the grid. Exported solar electricity serves nearby customers’ loads. Net metering allows residential and commercial customers who generate their own electricity from solar power to feed electricity they do not use back into the grid. Many states have passed net metering laws. In other states, utilities may offer net metering programs voluntarily or as a result of regulatory decisions. Differences between states’ legislation and implementation mean that the benefits of net metering can vary widely for solar customers in different areas of the country

How many units does 1kw produce in a day?

It varies form place to place and also depends on the climatic conditions. The generation depends on the amount of solar radiations received at a particular place.Depending on the region and its DNI ( a measure of amount of sunlight available), the solar panel output for a 1 kW PV plant can be between 3-4.5 kWh of electricity a day on average, or 1100-1600 kWh of electricity a year. We say average because these daily generation numbers are different throughout the year even for the same location. Thus, the same 1 kW solar PV power plant could generate even beyond 5 kWh during some days in summer and less than 4 kWh during some days in winter. Averaged over the year, the estimated solar panel output could be about 4.5 kWh. If the solar panel is working under standard conditions i.e. temperature of the cell is at 25* Celsius, solar irradiance is 1000 watt/m2 and mass of the air is 1.5 then it should produce a unit of electricity per hour.

Will solar work in winter and rainy seasons?

Many people think that a hot sunny day will produce more electricity than a colder sunny day. This just isn’t the case. Solar PV relies on the light of the sun, but higher temperatures actually reduce the effectiveness of the panels. So cold and bright are actually ideal conditions. Having said that, the lower the sun is in the sky, the less energy will reach the panels. In winter or rainy season, the sun will be lower in the sky, and therefore will produce that bit less energy. Couple that with the fact that winter days are shorter and unfortunately you can say panels will not be as effective in winter or on a rainy day but considering the Indian Whether we have nearly 300-320 clear sunny days which will not be a major problem to your annual generation. On an average standard 3kW system facing due south, producing around 350-375 kWh during May or June, will produce around 250 kWh in a winter or rainy months like December or January.

How much does a grid connect solar power setup cost?

Prices vary according to size and location – Please use our quick solar quote provided in the website to know the cost.

Is 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.

How long will my grid connect solar power system last?

Solar modules 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 performance warranty of 25 years. There are solar panels delivering power in India today that were installed more that 30 years ago. The electronic components such as inverters, being the most sensitive, will last 10 -15 years.

What 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.

If 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.

What does a typical home solar system consist of?

The heart of a photovoltaic solar system are the solar Panels. Solar Panels made up of multiple panels (individually measuring roughly 1 by 2 meters) forms arrays, these array’s absorbs the energy of a specific range of available sunlight and converts this energy into electrical energy. The array is mounted on solar mounting structures 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. Dc cables are run down from the array’s to the inverter, a device designed to efficiently convert the widely fluctuating power (DC) from the solar array’s into a predictable and usable energy feed(AC). A second cable connects the inverter to your house’s Panel Board board, 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 (Either through Lan or Wifi).

Is there any maintenance involved?

With an grid connected system, there is very little maintenance required. Electronic components should be maintenance free. Electrical Wires and other auxiliary Compounds Maintenance depends on there lives and Conditions of Installation.

How 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.

What 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.

How much roof space is needed?

1.0 KW system needs approximately 9.3 Sq.meters (100 Sq.ft),

Is solar power cheaper than grid power and diesel generators ?

Rooftop solar power is much cheaper than power from diesel generators. Solar PV generates power at a cost of about Rs. 7-8.50/kWh while diesel generates power at about Rs. 16/kWh (a litre of diesel generates around 3-4 kWh per litre). Diesel power can be even more expensive once losses such as pilferage, evaporation, etc. are taken into account. In some applications, such as rural telecom towers, diesel power can cost as much as Rs. 40/kWh!

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