Solar Energy

The energy from Sun can be harnessed in mainly 2 ways:
  • By using the solar energy in its original form as thermal energy for heating purposes
  • By converting it into electrical energy with the help of Photo Voltaic (PV) solar cells
about_usAs thermal energy, the main application is in Water Heating. Hot water from a solar water heater serves various purposes at home or commercial establishments, ranging from bathing, cooking, heating of floor / swimming pool and other general purpose heating. The efficiency of solar water heater as an equipment is also much higher than any electrical equipment for similar use. When electrical energy is converted to thermal form, there is substantial loss of energy in the process.

about_ustElectrical energy itself is generated many a times from thermal energy, in which case the wastage of energy takes a massive proportion leading to huge carbon emission. It is therefore prudent to maximise use of solar thermal energy for all heating purposes. On the other hand PV cells convert solar energy into electrical energy which can be put to any normal use in our daily life. Although, efficiency of solar cells is not very high, it does not result into any carbon footprint or wastage of natural resources since solar energy is available in abundance, in continuum and its conversion to electrical form is totally  With the advancement of solar power generation technology, it is rapidly becoming more economically viable. There are a number of effective uses of solar PV cells in standalone equipment like street lights, road studs, lanterns, flash lights and small home lighting systems and so on. In the last few years, there have been a quantum jump in the world in installing PV power plants of fairly large capacities. In India too, there has been a spurt in installation of grid connected PV power plants in the last couple of years. Simultaneously, there is also a rise in trend for installing off grid systems on rooftops and Building Integrated PV (BIPV) systems.

Aegasun offers a range of customised solar PV installations from concept and design to commissioning for residential, commercial and industrial applications. These installations can be designed based on the need of the customer and installed at site by our experts. The scope will include system design, material specification, plant layout, supply of components, system integration / installation and commissioning. Typically, a shadow free space of about 10 Sq. M is required per kW of solar panels.

  • In case of grid connected systems in States where Net Metering facility is available, coordination with local Electricity Distribution Company will be necessary for approval and installation of bi-directional meters. The cost of a grid connected system is generally lower compared to off-grid system because of elimination of batteries.
  • The cost will depend on various parameters like type of system (off-grid / hybrid / grid tied), size and features of inverter, rating of panels, battery capacity, site conditions, cabling requirement etc. Roughly, the cost will vary from Rs.75,000 per kWp to Rs.160,000 per kWp system. The return on investment in terms of payback starts from as low as "3 years" depending on local utility tariff, eligibility for depreciation benefit and type of system.


  • No or negligible running cost
  • Raw materials (Sun light) normally available in abundance without any Logistics need
  • System cost has become lower lending grid parity to solar energy
  • A boon for delivering energy in remote areas
  • Works as a shed and also reduces temperature underneath by app 4°C
  • Return on Investment has become quite attractive


  • Available only during sunshine hours
  • Generation drop in cloudy / rainy weather
  • Needs shadow free area; can't be installed with trees around.
  • Dependence on grid (for grid tied system)
  • High space requirement
  • Energy storage a critical issue

Off grid application

Off grid Solar Power Systems are used in household and commercial applications where energy is stored in batteries for use at night or as and when necessary. The main features for such a solar power facility are:

  • Generated Solar Power is used to run load as well as charging battery or storage device
  • No need of availability of grid power, hence best suited for remote areas without power
  • Excess solar energy after catering to load and battery charging, is wasted
  • Facility to draw power from grid when demand is more than solar energy
  • Priorities can be set based on need e.g. Solar – Battery – Grid or SGB or GBS etc.
  • Costlier compared to Grid-tied systems and Requires maintenance

Grid tied application

  • Power is generated and used only during sun shine hours
  • No facility for energy storage, hence can only be used when generated
  • Automatic balancing of energy supply from Solar and shortfall from Grid
  • Quality of Solar Energy matches that of Grid
  • Solar Energy is generated if and only if Grid / DG Set Power is available
  • Excess generation is fed to the grid
  • If net metering (bidirectional metering) is not available from Utility:
    • Special arrangement need to be made to avoid grid feed
    • Load must be higher than or at least equal to generation ALL the time, so that energy is not wasted
  • Economical compared to Off-grid systems
  • Easier to maintain

Net metering is a billing mechanism that credits solar energy system owners for the electricity they add to the grid.

  • Where net metering is available:
    1. If a customer has a PV system on the rooftop, it may generate more electricity than he uses during daylight hours
    2. This excess energy if fed into the grid will earn him a predetermined credit.
  • However, if net metering is not available:
    1. The excess energy, if fed to the grid, will be measured as consumption and rather than getting credit, the customer will have to pay for it!!!
    2. Load should be more than generation to avoid grid-feed

Benefits of Grid Tied Solar PV Power Plant with Net Metering

  • Generate Electricity through solar PV plant installed at your roof itself
  • Energy generated during the day (sunlight hours) is first consumed by the daytime load
  • If the generated energy is inadequate, the system automatically draws balance requirement from the grid
  • If generated energy is higher than required by load, excess energy after catering to the load is exported to the grid
  • At night, when there is no sunlight and hence no generation, load runs on grid power
  • You pay for the net energy drawn from the grid (Consumption less Export to grid)
  • There is no need to store energy in Batteries for use at night, hence the system is cheaper, more efficient and requires very less maintenance
  • Post payback period, the system will deliver free electricity for another 20 to 25 years
  • Depending on Utility Energy cost, Investment is paid back in approx. 3 to 6 years
Solar Thermal Water Heater
PLM Pipes
Solar Power Pack
Solar Roof Top Plants
Solar Home Lighting System
Solar Street Lighting System
Solar Pump System