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FAQs

 
 
 

1. What is a solar photovoltaic system?
2. What is a grid-tied solar electric system?
3. What is the lifespan of a photovoltaic system?
4. What is the maintenance required to keep a photovoltaic system operation?
5. How much will it cost to install a grid-tied PV system on my home?
6. Why did a PV system produce more or less energy than itís estimated?
7. Does a PV system produce electricity when it is cloudy or cool weather?
8. How much roof space do I need for a photovoltaic system?
9. What size of a photovoltaic system do I need?
10. What if my roof needs repairs after Iíve installed solar panels?
11. How does solar electricity affect the environment and help offset climate change?
12. How does Net Metering work with PV systems?
13. What is Time of Use (TOU) metering?
14. What is the payback period and return on investment?
15. Will my solar system need to be inspected by the building and utility authority?
16. What happens if there is a black out?
17. What are the warranties?


1. What is a solar photovoltaic system?

A photovoltaic (or solar electric) system use PV cells to convert the sunlight energy into electricity by producing direct current (DC) in the PV panels. The DC current is sent to an inverter that converts the DC current to alternating current (AC) for general use in your home or business. This balance of system components typically includes a charge controller, an inverter, wiring, and a form of electricity storage such as batteries. AC electricity can then be used to power your appliances directly, or feed back to an electric utility's grid.

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2. What is a grid-tied solar electric system?

A grid-tied solar electric system is connected directly to the utilityís grid. A grid-tied solar electric system is designed to meet all or a portion of your daily electric energy needs. This connection allows you to use electricity at night or when your system doesnít generate enough power. It also allows you to send the extra solar electricity back to your utilityís grid for later use.

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3. What is the lifespan of a photovoltaic system?

A Photovoltaic system included the main component of solar modules and inverters. Solar electric modules have proven long-term reliability. A conservative estimation of the moduleís design lifespan is over 40 years and the inverterís is more than 15 years.

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4. What is the maintenance required to keep a photovoltaic system operation?

Solar electric system is the solid-state technology and has no moving parts. Therefore, a solar energy system requires very little maintenance.A solar array should be rinsed off with a hose once or twice a year to clear the dust or debris that blocks sunlight to keep solar modules efficiency.

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5. How much will it cost to install a grid-tied PV system on my home?

Grid-tied photovoltaic system final cost depends on many factors such as your annual energy usage, size, type and configuration of system, type and structure
of roof such as material and pitch, type of mounting system, cableand wiring, the difficulty of installation, available rebates and incentives. The installed cost of a grid-tied PV system typically ranges from $8 to $10 per watt. This is the cost before any rebates and incentives. The cost of electricity from the utility continues to increase, while the solar electric system produces energy for free. Additionally, a solar electric system can increase a home's value.

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6. Why did a PV system produce more or less energy than itís estimated?

The PV system will produce the most power on a bright day. But the solar system will produce electric power throughout the year even on cloudy or overcast days. The PV system may produce more or less than itís estimated. Annualy weather condition can affect the total output of a solar electric system.

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7. Does a PV system produce electricity when it is cloudy or cool weather?

Yes. Solar electric systems work in cold temperatures during winter months because cold temperatures cause an increase in the conductivity of metals. The PV system will continue to produce electricity during cloudy weather as well. But the energy produced by solar system will be less than when the sky is clear and sunny.

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8. How much roof space do I need for a photovoltaic system?

The overall space your solar electric system needs depends on the amount of electricity you want to generate and solar panel size. Most homes require roughly between 400 ft2 to 800 ft2 roof space equivalent to a solar system size of 5-10 kW.

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9. What size of a photovoltaic system do I need?

The size of PV system for your residence depends on several factors including the last a year of your household electric usage in kilowatt hours (kWh) on your utility bills, roof available space, orientation, tilt, azimuth, location, shading, your utility rate structure and your burdget which affect the efficiency of the system. Another major factor is whatís portion of your electricity you want to offset. Your system size should be equal to or little less than your annual kilowatt hours (kWh) consumption.

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10. What if my roof needs repairs after Iíve installed solar panels?

Weíll come out to inspect your home prior to installation and check to make sure your roof is in good condition and is suitable for a solar system installation. In case if your roof needs repairs after installation, the solar panel will be removed and re-installed. We provide such service with a reasonable charge.

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11. How does solar electricity affect the environment and help offset climate change?

Coal-fired electrical power plants are responsible for 72% of all sulfur dioxide emissions in the U.S. Each 100 kilowatt of solar electricity installed offsets up
to 253 megagrams of carbon dioxide (CO2), 1600 kilograms of nitrogen oxides and 900 kilograms of sulfur oxides per year. The solar electric system produces a clean, sustainable and renewable solar electricity with no pollution and it reduces globe warming and climate change.

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12. How does Net Metering work with PV systems?

Photovoltaic systems are connected to the utility grid. In a grid-tied solar PV system, electricity can flow through your power meter in either direction. When solar electric systems generate more electricity than youíve consumed, the power meter reverses direction and returns excess electricity to the grid. At other times, you may need to draw electricity from the utility grid and it makes power meter spin forwards. Basically, youíre selling you excess energy to your utility company
at the same retail rate that they charge you, not at he electrical wholesale rates. Customers may receive credits at retail electricity rates through this process of exporting extra electricity. Your power meter is typically used to measure the difference between the electricity used and the electricity produced. Typically once a year, the utility company will charge the difference if there is more electricity used than produced.

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13. What is Time of Use (TOU) metering?

A Time of Use (TOU) rate plan from utility company bases on the price you pay for electricity on the time of day and the time of year you consumed. Under the net metering police, the power company must credit you at electricity retail rates not wholesale rates for any extra power you produce. You typically pay more for electricity during peak hours in the day and pay less during off-peak hours at night.

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14. What is the payback period and return on investment?

When you invest in a solar system, you are essentially pre-pay for future electricity at current rates. Electricity prices in New Jersey and New York ware increased almost every year and the electricity rates continue to rise. A solar system will typically pay for itself in around 6 to 7 years. The solar panels have over 40 years lifespan. Thatís 30 years of positive cash flow, money in your pocket and free, clean electricity with no electric bills. The return on investment (ROI) varies from 4 to 6 years based on the future power price, your rate structure and household kWh consumption, rebates, incentives and tax advantages.

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15. Will my solar system need to be inspected by the building and utility authority?

Yes. Solar systems that receive government rebates typically require proof of approval from the building jurisdiction. General and electrical construction is required inspection from the building and utility authority.

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16. What happens if there is a black out?

If there is a black out, your PV system will turn off and you will lose power during
a black out. For a safety requirement by the utility company, their technicians can repair and fix electrical lines.

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17. What are the warranties?

The manufacturers offer a 25-year limited warranty on power output for all modules and a 10-year limited warranty on inverters. The module manufacturers warrant power output for 25 years from the date of purchase. The first 10 years are at 90% of the minimum rated power output and the remaining 15 years are at 80% of the minimum rated power output. GreenTech solar USA offers an additional 5 to 10 years warranty on installation and workmanshop. We will provide you with all warranty documentation on your system.

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