Photovoltaics FAQ’s

Browse through our Frequently asked questions on photovoltaics below.

1. What is Solar Energy

Solar energy takes advantage of the sun’s rays to generate heat or electricity. It is an infinitely renewable resource and unique for its ability to generate energy in a quiet, clean, and consistent manner. Can’t beat the sun for being oh-so-cool!

2. How do Solar Photovoltaic Cells Work?

In layperson terms, photovoltaic cells are comprised of a semiconductor material such as silicon. Added to the silicon are the elements phosphorous and boron which create conductivity within the cell and activate the movement of electrons. The electrons move across the cell when activated by the sunlight’s energy into the electrical circuit hooked up to the solar panel.

3. What is the difference between solar panels versus building integrated photovoltaic (BIPV) products?

Solar panels are flat panels of photovoltaic arrays mounted on a roof or a pole to capture the sun’s rays. Building integrated photovoltaic materials are PV arrays that are integrated into the building material itself, primarily windows, roof tiles, or walls. Solar panels work well for retrofits or remodels while BIPV are appropriate for new construction or a major renovation.

4. How much will I really save on my utility bills from a home electric solar power system?

Of course this is a relative question. It depends, in part, on how much electricity you use and how efficient the appliances are that you operate. That said expect to generate excess electricity in the summer (when days are long) which can potentially offset the energy you use from the grid in the winter. A combination of energy efficient appliances and light bulbs can help reduce your homes energy bill by over two-thirds.

5. What’s the difference between solar photovoltaic and solar hot water systems?

While both types of solar systems capture energy from the sun, solar photovoltaic systems use photovoltaic panels to produce electricity. Solar hot water, or thermal, systems capture sunlight to heat water for domestic use, to heat a swimming pool, or for a radiant heating system.

6. What are solar hot water systems?

Solar hot water systems, broadly termed solar thermal systems, use the sun’s energy to heat water. Solar hot water systems can be used to heat a hot water tank or to warm a home’s radiant heating system. Swimming pools and hot tubs use a modified solar hot water system for heating water.

7. How do pool heating systems work?

Pool heating systems use a modified solar hot water system to capture the sun’s rays to heat your pool or hot tub.

8. Can I use solar power to heat my home?

Absolutely! Radiant heating applies solar thermal technology. Transferring solar energy through pipes into an under floor radiant heating system is a wonderful way to stay warm. Radiant floor systems are typically 40 percent more efficient than their forced air counterpart and can be zoned to match thermal comfort to each room.

9. How much maintenance do solar energy panels require?

Solar photovoltaic panels require little maintenance – no need to wash or dust. It is, however, important to place panels where they will remain clear of shade and debris. Thus you will have to wipe them off if too much snow or leaves fall on them. Solar hot water collection arrays don’t need much attention either. It does help to periodically use a window wash brush, biodegradable soap, and water to clean the tubes.

10. Do I need special insurance requirements when installing a power system?

Standard homeowner’s insurance policies usually suffice to meet electric utility requirements. However it is important to discuss this with your insurer before installing a system.

11. When should I seek a solar professional?

Although solar energy systems work in parallel with conventional residential electrical and plumbing systems, there are quirks in the process well suited to seeking out professionals who specialize in solar power installation. Solar installation professionals can help you determine the type and size of system most suited for your needs.

12. What should I ask a solar professional installer?

Solar professional installers can take the guess work out of installing a solar power system. Whether you are considering solar photovoltaic, solar hot water, or solar heat for your pool, a solar pro can help you determine the type and size of system that will work best and guide you through the process.

13. How can I calculate the cost and payback time from a solar power installation?

You can estimate how much a solar electric or solar hot water system may cost if you determine your current energy needs and costs and compare against your future anticipated use. Once you have a sense of how much energy you use, you can evaluate the cost of purchasing and installing one or both of the technologies.

14. How long will it take to install a solar power system in my home?

Planning, configuring, and doing any custom ordering for your solar energy system can take up to a few weeks. However, the installation process itself can typically be completed in only a few days time, in many cases even less.

15. Will I need a building permit to install a solar energy system in my home?

It is important to check with your local authority if any codes exist that govern the mounting of solar panels, water heaters etc. You can confirm with your installer as well,

16 How much space do I need for a solar photovoltaic system?

In bright sunlight, a square foot of a conventional photovoltaic panel will yield 10 watts of power. That’s a helpful rule of thumb for calculating a rough estimate of how much area you might need. For example, a 1000 watt system may need 100 – 200 square feet of area, depending on the type of PV module used.

17. How many solar panels do I need for an electric solar power system?

The size of the photovoltaic system is correlated to your home’s energy-use needs, available space for a system, and overall costs for the system components and installation. Solar contractors in your area can help determine the best size for your solar photovoltaic system.

18 How much shading is too much for solar photovoltaic panels?

Unfortunately shading a photovoltaic system dramatically decreases its output. Just shading the bottom row of wafers alone amounts to an 80% reduction in efficiency. So above all, don’t shade your array!

19 How do I know if solar panels will work on my home?

Take a look at the position of your home on its lot – and particularly your roof. Ask the following questions: Is there good “Northen” exposure? – Orienting solar panels to the North maximizes the effectiveness of energy collection. Is the exposure free of trees or buildings that could shade the panels or drop debris on them? – Shading photovoltaic panels dramatically reduces their effectiveness. What is the pitch of your roof? – Most roofs, from flat to 60-degrees can accommodate photovoltaic panels.

20 Do I need to have North facing exposure to have a solar energy system?

Although Northern exposure increases the effectiveness of a residential solar power system, your home may still work for solar power without having the North facing exposure. The number of panels required will increase however.

21 What other factors are important to consider when installing a home solar energy system?

The location of your home and the local climate will play into where you place and how you install your solar electric or solar hot water system. Wind speeds, heavy snow loads, and salt water can all affect a solar array. Understanding how those inputs effect performance will determine the types of mounts or how the arrays are angled. A solar pro in your area is likely quite knowledgeable about your local conditions and can help you design that works well for you.