Questions And Answers
Everything you need to know about Rooftop Solar Systems
When the rays of the sun fall on solar modules placed on the rooftop of houses, commercial building or industries, the individual cells inside the module help convert sunlight into DC electricity. However, most appliances in our home work on AC electricity, and therefore the modules are connected to an inverter which does this conversion. Once the conversion has happened, the output of the inverter which is AC electricity, is connected to the mains of your home to allow you to use solar energy.
It is important to note that you can use electricity from your rooftop solar power plant in conjunction with the electricity sourced from your DISCOM. This kind of arrangement is very common and one that solar installers are expert at managing. However, if you want to go with a system that is backed by a battery to help you use solar at night time, you must go for a hybrid or an off grid system. What exactly is that? That brings us to the next section, which is what are the different kinds of solar systems that you can opt for:
Grid connected systems or on-grid systems, are solar systems that are connected to the building mains directly. These systems give priority to the solar power generated and only if the generated power is less than that required, will the grid power be used. As explained above, inverters are used to convert the produced DC electricity to AC. In case you opt for a grid connected system, you are eligible for Net Metering, a process where all the excess power that you produced is fed back to the grid and you receive a credit for the same. In case you generate more than you consume in one complete year, the DISCOM also pays you for the excess units generated. In many states, Net Metering has been made mandatory to avail subsidy for solar.
Off-grid solar systems are different from the on-grid system in the sense that they are set up independently from the state grid. These systems have an additional battery backup system which is charged by the generated solar energy. Batteries are charged when the generated power is more than the power being consumed. While on paper, battery backed systems sound like a great idea, these systems are generally more costly than on-grid systems and have lower efficiency. The battery needs to be replaced every five years or so but on the positive side, you can use solar energy even in the hours where there is no generation. Off-grid systems are perfect for your rooftop solar plants if you have a very erratic power supply or do not get any power at all.
A hybrid system brings the best of both worlds and is a combination of an on-grid and off-grid solar system. Hybrid systems have a battery backup which helps store the generated energy. What differentiates hybrid systems from off-grid systems is that, once the battery is fully charged, any excess power generated which is not being utilised will be fed back to the grid and the you will get suitably compensated. A hybrid system can also have other sources of energy producers, such as Diesel Generator (DG) or Wind coupled in the system.
With the UNIQUE SUN POWER Advanced Rooftop Solar Calculator, you can factor in virtually all of the above at one place and very easily find your solarisation potential. Not just that, but with the Advanced Calculator, you can also understand and avail the different financial options available to you and make a choice whether to buy solar system and all its parts or just buy solar power.
- Evaluate your solarisation potential using our advanced yet easy to use tools.
- Compare quotes from a list of pre-screened installers so that you are sure that you always get the most competitive and best prices in the market
- Buy your solar system once you have chosen the best quote and provide you with financial options and secure payment mode too.
- Simplify solar for you
- Provide you with competitive pricing
- Ensure you only deal with us and our pre-screened installers
- Make buying solar simple and easy
- Present Easy Financing options and help you get easy to service loans
- Ensure high standards of quality are maintained
- Give you a lifetime of support.
- Roof or land should be exposed to the sunlight for the whole or for most of the day.
- Get your home or office surveyed from an expert solar company to help calculate shading and to estimate installation capacity, generation and utilization of solar energy.
- Understand the cost involved and savings you will make, and any tax benefits etc when you go solar.
- Guarantees and warranties of each component, workmanship and plant performance needs to be discussed in detail and should be included in the contract.
- You should contact only qualified and reputed Installers/ Suppliers or visit UNIQUE SUN POWER’s platform to know the most accurate benchmark prices in the market. Find out the right system size that fits your budget without compromising the quality as the solar system has to have atleast a 25 year life.
- Select the best quality of mounting structure and hardware. It may be slightly more expensive, but you will be assured about quality, durability and lifespan of 25 to 30 years.
- Specifications of solar components, material and payment terms needs to be agreed with your installer
- Discuss with your Installer on permits and approvals required
- Ensure adequate access to the site for the workers and material / equipment.
- Delivery of material and components must be done with relevant documents at site.
- Requisite care and safety must be observed while unloading, shifting and placing of solar components.
- Specifications of material/ equipment received should be as per the contract.
- Civil foundations should be well finished and plastered.
- Curing of civil foundation should be properly done
- All hardware should be tightly and properly fitted in the foundation / structure / wall since loosely fitted solar panels can result in major damages.
- Fasteners should be provided in each hole of solar panel.
- Cable on structure should be laid through HDPE pipe. Cabling on wall and structure should be well tagged, clamped and dressed.
- All electrical connections should be identified and should not be in loose condition.
- All structures/ panel mounting arrangement, equipment/ components should be connected properly to an earthing system at two defined positions. This may not be required for very small system sizes. Consult an expert on it.
- Request for all guarantee and warrantee certificates / documents, system test reports, energy meter test reports, permits, documents related to incentives and subsidies alongside relevant approvals from DISCOM, if required.
- Keep the contact details of the installer handy all the time.
- Keep solar panel clean to ensure high efficiency and performance of your solar system and ensure that you do not leave panels with accumulated dust, fallen leaves and bird droppings.
- Use clean water for cleaning of the solar panels.
- Clean the solar panels before 10 AM or after 5 PM to ensure that the system generation is not adversely affected.
- If you face any problems with the system, please call your installer or the maintenance service provider.
- There shouldn’t be loose cabling and wiring on roof floor.
- Do not hang clothes on solar panels or structures.
- Avoid allowing kids unattended in solar installation area.
|Grid-Connected Rooftop Solar System Size (kWp)||System Cost (Rs) per kWp (Exclusive of taxes)|
|1 to <6||48,300 Rs.|
|6 to <10||48,000 Rs.|
|10 to 1000||44,000 Rs.|