What is HIT Double®?

Bifacial solar technology, made only by Panasonic, means our solar panels are able to generate power from both the front and back face of the panels simultaneously, achieving the highest power per square foot of any solar panels in the world. 

 Should I repair my existing roof before installing a solar system?

Yes; if your roof is old or requires repair, it is advisable to fix or renew it at the same time you install a solar system to avoid future costs of removal and reinstallation of your solar system.

 How much space do I need for a solar system?

The amount of space your solar system needs depends on the amount of electricity you want to generate. Most homes require a solar system the size of 2kW-5kW (when using HIT® panels).


For a first calculation, please use our solar calculator. 

 Does shadowing affect my solar system?

Yes; your solar system should be placed where there is minimal shadowing from trees, buildings, chimneys, satellite dishes or other objects. Mind the shadows change with the seasons!

 Does a solar system work in cold weather?

Yes. Solar systems work in most weather conditions, and may even perform better in cold temperatures during winter months, as cold temperatures cause an increase in the conductivity of metals and wires.

 Will snow affect my solar system?

Not much. During the day, your solar panels capture heat from the sun, melting the snow, and are typically angled, which helps slough off snow, allowing your system to continue generating electricity. If you purchase HIT Double® bifacial panels, the back face will continue to produce power even when snow covers the front face.

 Will a solar system produce even in cloudy weather?

Yes; solar panels absorb various spectrums of visible and invisible light, but the energy produced by your solar system will be less than when the sky is clear and sunny.

 What happens if my solar system stops working?

There are no moving parts to break (meaning no mechanical wear and tear) so systems will last many years without failure, but if it does stop, contact your installer and ask for a check-up. Do not attempt to repair the solar system yourself.

 Do I have to be at home while the system is being installed?

Talk with your installer about time requirements. Often, solar systems can be installed without the need to regularly enter the house.

 Do I need to add anything else, like lightning rods, roof structures, etc.?

Your solar provider will know the details of connecting your system to the electric grid and complying with local codes. They will advise you about any additional components that may be necessary.

 How long will installation take?

Installaing a solar system is very easy, which makes pv an easy choice for most people. Installation for a house usually takes 1-7 days depending on the size and complexity of the system.

 What maintenance is required?

Wash dust and dirt off your solar panels twice per year with water and a soft brush. An easy solution is to ask your solar provider about a maintenance package, including cleaning, checking the electrical connections of the wiring and general condition of your system.

 Is there any preparatory work needed within my house?

Before you install a solar system, it would be best to increase the energy efficiency of your house. Install energy-saving lights and insulation, and upgrade to energy efficient appliances and windows, where possible. When your house is more energy efficient, the solar system you purchase can be smaller (and cost less!) to meet your energy needs.

 How do I choose the ideal installer?

Look for experience, proper licenses, insurance, references, local proximity, and choose a provider you feel comfortable with.

To ensure a reasonable price, solicit bids from several providers and compare their offers.

You might also want to look out for:

Do they provide a timeline and checklist?
Do they offer on-site inspection and bill analysis?
Do they provide a financial and energy prediction, covering several years?
Will they handle all paperwork, permits, utility agreements, etc.?
Is there a full system warranty for five years (or more)?
Have they accounted for shadowing, poles, wires or future buildings?
Do they include annual maintenance checks or cleaning?
Is there a monitoring package included, so you can view the results of your solar system over the Internet?

 What are the quality factors of Panasonic modules?

The high quality of our products is very important to us. Therefore, we perform detailed quality tests after each production step at our factories. Also, we pay a lot of attention to research and development and we always try to work on new, innovative ways to constantly improve our products. Since 1975 SANYO, now Panasonic, is one of the key players in developing solar technology. This long-term experience makes a trustable expert.            

As a leading company, we are certified by the most prestigious bodies:

  • Quality tested, IEC 61215
  • Safety tested, IEC 61730
  • Ammonia resistance tested
  • Salt mist corrosion testedEven though not mandatory for solar panels, our products comply

With the directive restricting of the use of certain hazardoussubstances in electrical and electronic equipment 2002/95/EC.
This directive restricts the use of hazardous materials, such as lead, cadmium and mercury, used in the manufacture of electronic and electrical equipment.

 How do I find out how much space I can use on my roof for PV modules?

Basically, PV systems can be installed on any place where there is enough sunlight. It does not always have to be on a rooftop. But if you wish to use your roof, you should ideally choose the south facing roof side. When measuring the roof, also keep in mind the roof slope and any obstacles like skylights, trees, chimneys or neighboring houses, that could cast shadows on the PV system. With our solar calculator, you can make an initial calculation. In a second step, you can contact one of our Panasonic Solar Premium Installers with this information who will gladly come to you and make the exact measurements.

 How can I buy a Panasonic HIT® photovoltaic system?

The easiest way would be to contact a Panasonic Solar Premium Installer. We offer a tool that helps you to quickly find a PV installer in your area. He can provide you with a specific quote and help you find the right solution for your home.

 How do I finance a PV system?

In some regions, councils may provide financial support if you install a PV system. On top of that, for companies and enterprises the DECC may have incentives of which you can benefit when installing PV. With regard to financing and even if solar PV is not eligible as technology for the Green Deal, some of the providers involved in the Green Deal do also offer “green financing”. Please contact the DECC for more information. And last but not least, contact your bank, as they increasingly offer specific financial products for carbonreducing technologies.

 What is special about the HIT® technology and why are the Panasonic HIT ® solar cells so powerful?

Silicon is an important raw material for solar cells. In the manufacturing process, small discs of silicon, so called wafers, are cut off of silicon ingot. Panasonic uses high quality monocrystalline Wafer. To increase the yield of a Wafer, Panasonic  uses a special technique, known as the HIT ® technology.  "Heterojunction with Intrinsic Thin Layer" describes the special hybrid structure of the solar cell. The HIT ® solar cell is basically a "two-in-one system" with its high-quality monocrystalline Wafer (c-Si) embedded between two amorphous silicon layers (a-Si).  This "sandwich"  of the amorphous silicon layer is like a double barrier and leads to a lower energy loss compared to conventional solar cells. This is called the so-called recombination effect of HIT® solar cells.

 What is solar energy?

The term solar energy generally decribes the use of solar radiation to produce energy. Photovoltaics is the direct conversion of solar energy into electricity. The term "photovoltaic" comes from the components photos (φῶς, phos, genitive: φωτός, photos) - the Greek word for light - and Volta after Alessandro Volta, a pioneer of electrical engineering.
The "photovoltaic effect" is defined as energy particles of sunlight (called photons) meeting an electron. If an electron dissolves from the atom, electric current flows under certain conditions. Some 50 years after the discovery of this effect, the construction of the first electricity-producing solar cell was achieved. For this purpose, a silicon disk, a so-called "Wafer" is used. The DC voltage that the solar panels generate needs to be  converted by an inverter into alternating current to be fed into the general power grid.

Since the 1960s, Photovoltaics have been used for power generation in space. SANYO started the development of amorphous silicon solar cells already in 1975. For over 15 years they are manufactured in mass production for the global market. Meanwhile, HIT® solar modules are sold under the Panasonic brand.

 Which factors are important to me if I want to buy my own HIT ® solar system?

Use our solar calculator to determine the first parameters to your solar system:

  • You need a qualified installer who will advise you when planning your system. 
  • Use our "How do I find an installer" tool to find a Panasonic Premium Solar Installer in your area.
  • See our HIT® solar planner for the 7 most important steps you should consider when investing in a solar system.
  • Make an appointment with your installer and show him these planning documents.
  • Take advantage of our calculation tool and calculate what you can save per year with a Panasonic HIT® solar system.