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TECHNICAL / COMMERCIAL FAQ'S

When can you be contacted to answer questions?

Contact any time by phone on 9901970372, our email solar@optime.co.in or visit our website www.optime.co.in

Is solar power cheaper than diesel/grid power?

If the price were to increase by 10% a year (which has been the trend), diesel would cost about Rs. 83/litre in 2020 and the cost of power from diesel would be close to Rs. 25-40/kWh.

Same think grid power annual inflation Assumption by 10% a year increase would cost Rs.15/KWh in 2020 depending on the state and the specific consumer category.

How much does a solar PV system cost?

Again Depends on individuals’ installation and product requirement, approximate cost is Rs.120 /watt.

Can solar PV replace diesel entirely?

Rooftop Solar PV is not likely to entirely replace diesel power in your organisation. It can rebate diesel consumption by taking up part of the load.

How much roof area do I require to install a solar PV system?

Rooftop Solar PV plants require 100-130 SF of shade-free roof area per kW of plant capacity.

Is Shadows effect the Generation?

Shadows falling on the panels not only reduce power output but also damage the panel Rooftop.

What is the Weight of the plants?

Plants weigh 30-60 Kgs/m2 which is too heavy for asbestos roofed sheds. Installation on Concrete slab/ metal roofed sheds should be decided on a case-to-case basis, the mounting structure should be designed to handle cyclones where wind speeds can reach 200 kph.

How much electricity does a solar PV system generate?

Based on experience, a 1-kWp photovoltaic installation produces between 1260 and 1800 kWh of electricity, depending on the region you live in, the alignment of the modules, the weather conditions and the system quality and technology. In good years and in optimal locations, it is possible to produce more than 1,800 kWh a year.

Is my roof suitable for a photovoltaic installation?

Photovoltaic installations can be installed wherever there is sufficient solar radiation. Therefore it is possible to mount a PV array on a lot of different roof surfaces. A PV system works best when facing south and is adjusted to an inclination appropriate for your location. A deviation to South-West/South-East or inclinations between 25° and 60° only slightly reduce the energy yield. Shading by trees or adjacent buildings etc. should, be avoided for best results.

What are the various components of a rooftop solar system?

Solar PV panels (also known as solar PV modules) work by converting sunlight into electricity. The electricity generated by the PV panels is Direct Current (DC). This needs to be converted into Alternating Current (AC) using an inverter.

The panels are mounted on the rooftop using special mounting structures.

If solar power is required when there isn’t enough sunlight for the panels to generate electricity (such as at night), a battery backup is required

A charge controller is required to regulate the charging of batteries.

A DC Array combiner box, DC-AC Distribution Box and accessories.

Lightning arrestors and dedicated Earthing.

What is the capacity of the solar power system I require for my facility?

Sizing your solar PV plant can be achieved through 5 steps Scoping of the project Calculating the amount of solar energy available, Surveying the site, Calculating the amount of energy needed, Sizing the solar system, If the solar plant is unable to supply the entire load, we can consider 3 options Solar power for critical loads ,Solar power for light loads ,Solar-diesel hybrid due to the complexities involved in sizing the system relevant to your load profile we recommend working with an experienced solar installer.

How large should my PV system be?

Generally speaking, the size of a solar system is determined by the amount of power you want to produce. For example, let’s say your family uses 3,500 kilowatt hours of electricity every year. If you wanted to offset that usage by 100%, you would need a PV system large enough to produce 3,500 kilowatts of power in a year. If you wanted to offset your power usage by 50%, then a system that would produce 1,750 kilowatt hours of power a year would suffice. The next consideration is available area for the PV array itself. For example, to produce 1,000 watts of power, an area of about 11 square meters is required.

The next consideration is overall cost. How much can you afford? May be you’d like to offset your usage by 100%, but it is more than you want to spend. If so, you could choose to offset your usage by 50% and add on to your system in the future. Your solar installer will be more than happy to present you with different options to meet your budget and get you on your way to saving money and reducing your carbon footprint.

How long will my photovoltaic system last?

Because solar systems have no moving parts, they very reliable and require little maintenance. Solar modules come with a manufacturer’s warranty for a lifecycle of between 20 and 25 years. Depending on the quality, the installation can last up to 30 years. PV modules typically don’t “die” when they get old; rather their output begins to diminish. For example, after about 20 years, the output drops to about 80% of nominal. Modern inverters have a useful life of up to 20 years, with manufacturers now offering warranties of between five and ten years.

How long does the installation take?

Typically, the installation of a photovoltaic system takes no more than a week. It can be more or less, depending on the size of your system and any special circumstances such as building a special mounting structure for the PV array.

How expensive is it to operate and maintain the installation?

Solar installations are virtually maintenance-free. The operating and maintenance costs for photovoltaic installations are therefore very low. It is important to check the system data regularly, though, so that any fault – as rare as they are in practice is detected at an early stage. Dust and dirt on the solar modules are generally removed to an adequate extent by rain and snow. If there is a more serious dirt problem (e.g. foliage or bird droppings), which is causing partial shading of the installation, this should be removed as quickly as possible.

How do you calculate the annual output of a module in kWh?

Wouldn’t it be nice if there was a simple formula for this! The annual energy yield is subject to so many influences (module alignment, cell material, location, weather) that it is impossible to give one simple answer to this question.

What are the Warranties and Certifications I should look for in my rooftop PV system?

Solar modules come with 5-year warranty against manufacturing defects as well as performance warranty of 90% of rated power output for 10 years and for 80% of rated power output up to 25 years Other components (inverters, batteries, junction boxes, etc.) come with 1-year warranty extendable to 5 years There are several IEC or IS standards that the various components of the solar system should comply with Inverters are the only major component of a PV plant that are expected to be replaced within the lifetime of the plant Batteries, if used, will also need to be replaced. They also require careful maintenance not all damage is covered by the manufacturer’s warranty e.g., shadow damage.

How do I choose a good vendor for a rooftop PV system?

Choosing a good vendor is critical to getting the most out of your rooftop PV system as carelessness in design or construction/installation can either significantly reduce the power output from your plant or deliver a plant that isn’t suited to your needs. A few things to keep in mind when selecting a vendor are.

How do I know the best vendor?

The cheapest vendor is not necessarily the best vendor. A vendor who has a well-established after-sales service network may quote a higher price but will provide greater benefits in the long run when evaluating different vendors, ensure that the plant specification, and not just the description, is the same. E.g., 1 kW panel + 5 kW inverter may be sold as a 5 kW plant but is actually only a 1 kW plant. Similarly, 5 kW panels + 1 kW inverter is also a 1 kW plant. Such plants can be offered at a much lower price than a genuine 5 kW plant, but will not generate anywhere near the same amount of power.

Is a permit required?

Permission from the local power distribution authorities is required in your area. For Details consult with your local solar installer for detailed information.

How is the electricity fed to the utility grid?

Once the direct current from the PV array has been converted to grid-compatible alternating current by the inverter, it flows through a meter and into the public utility grid.

Does the solar electricity have to be fed into the grid?

No. Typically, the connection of the power coming from your solar system is made on your side of the utility meter. What this means is that you use the power generated by your solar system first, and then subsidize that with power from the utility grid when needed.

Do I need to notify my building insurance provider when I install a system?

Yes. Because the building insurance policy would also have to replace the PV system in the event of it being damaged and theft, you should notify your insurance company so that it is included under your policy.

Does rooftop solar PV generates power during a power failure?

Not all rooftop solar PV plants generate power during power failure; only some do whether the plant generates electricity during power failure or not lies with the inverter The inverter matches the power from the solar plant with another source of stable power to ensure quality of electricity supplied. If another source is not available the inverter will not deliver power The inverter can also shut down the solar plant in the event of grid failure for the safety of those repairing the grid Only grid-interactive or hybrid inverters (which are a kind of grid-interactive inverter) will provide electricity even during power failure because they can utilise several sources of power, not just grid power, to provide the reference voltage that solar PV should match All solar PV power plants that deliver AC power require a reference voltage, whether from grid power or battery or diesel genset, to function.

Do I have to build my own plant or can I just buy solar power?

An intensive energy consumer who doesn’t wish to invest in a rooftop plant has 3 options for procuring solar power, 3rd Party Sale using Open Access Group Captive BOO(T) – Build Own Operate (Transfer) ,As both 3rd Party Sale and Group Captive use grid infrastructure to deliver power, the purchased power cannot be delivered during power failures unless the consumer has a dedicated feeder ,3rd Party Sale and Group Captive mechanisms are witnessed in only few states in India due to difficulty in obtaining permissions and high open access charges BOO(T) is not dependant on grid infrastructure but is limited by the extent of rooftop space available Vendors may also require a good credit rating or payment security from the consumer to be eligible for this model A careful evaluation of all applicable tariffs is recommended to ascertain the landed cost of electricity under each option.

What are the various policies and regulations (subsidies, incentives, permissions) that I should consider for my rooftop solar systems?

Central policy support for rooftop solar plants include Accelerated depreciation MNRE subsidy Renewable Energy Certificates Several states provide additional incentives based on their solar policies Net metering, or reward for excess power supplied to the grid, is slowly gaining ground in India .Permissions required for installing grid connected rooftop solar systems primarily involve receiving approvals from the local power distribution authorities, who may need to ensure that the grid infrastructure does not become congested.

What is a REC and how do you qualify for the rebate?

A REC (Renewable Energy Certificate) is trade able on the open market, each certificate represents 1 megawatt hour of renewable energy.

The government offers Certificates equivalent to the amount of energy they estimate a system will generate over 25 years. Certificates are issued to the system owner and can be sold at the current market price however the systems must be installed by a CEC accredited installer to qualify.

What is a kWh?

The kilowatt-hour (symbolized kWh) is a unit of energy equivalent to one kilowatt (1 kW) of power expended for one hour. One watt is equal to 1 J/s. One kilowatt-hour is 3.6 mega joules, which is the amount of energy converted if work is done at an average rate of one thousand watts for one hour.

What if the government rebate runs out?

The current average domestic cost of energy is appr. Rs.3.25 to 6.25 per kWh (excluding tax) depends on individual states and usage, and the cost of electricity is expected to continue to rise. The ERC's as they now apply mostly help with the initial purchase of your system as you either trade the certificates and gain a financial return, or we as the installer can trade them on for you and reduce the upfront cost of your system.

With or without the government rebate you will still produce your own energy from the sun and reduce your bills.

How long does the installation take and when we applied?

Systems are being installed within a 3 weeks of the deposit being paid. The central Govt 30% acceleration depreciation can be claimed on the same consecutive year on percentage basis as per the income tax act and 30% subsidy rebate will be released depends on the Funds availability.

Can I use the rebate to offset the cost of the system?

Yes it is your choice, you simply advise us at the time we complete your contract.

What electricity companies comply with the regulations?

All Local power Distributions companies allow connection of PV solar systems to network via Net feed in.

Can anyone install the solar system?

The Professional Integrators can install the System, by using your local Distribution company approved make solar System only.

 

 
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