Frequently Asked Questions
In our FAQ, you will find answers to the most common questions we receive from our users.
What happens with the energy if I do not use it immediately?
Under regulations for most of the European states, energy that is not used immediately in the household is injected into the public grid, where it is consumed by other customers. The compensation for the PV producer varies from country to country; please contact your local installer for more details.
Can I use batteries with my solar system?
From the technical point of view, yes, definitely. A battery system can shift the energy consumption and generation and you will make the best use of your solar system. However, specifics depend greatly on your country and its regulations. From a point of view of economical sense, the profitability of a battery system added to your photovoltaic system depends on the support scheme that your country has for solar and batteries. Please inform yourself locally about the different possibilities.
Are the solar panels a fire hazard?
Photovoltaic solar panels are considered by the fire regulators an item that does not increase danger of fire. Placed on top of non-flammable roofs, and made of materials that can burn, but not easily and not quickly, solar panels are very safe. In case of existing fire in a building, although the firefighters must know how to behave in the presence of solar panels, due to the wide spread of photovoltaics in the past decade, most firefighters know the protocols perfectly.
In almost all fires that have been related to solar power, the start has been pinpointed to the electronics that manage the power- in this case, risk is not different to having other electric appliances installed in your house.
Solar panels of Panasonic HIT are ROHS compliant, which means that we do not have hazardous materials in our products. In case of fire, no toxic fumes or residues will endanger your house.
Are solar panels recycle-friendly?
Solar panels in the EU have to comply with the WEEE directive, that handles waste of electrical and electronical products. We participate since 2007 in PV-Cycle, a company that recovers and recycles solar panels free of charge to end customers. Because of the valuable metals and other materials in a solar panel, and because it is technically quite easy to separate them, recycling is seen as a non critical item for crystalline solar panels such as Panasonic HIT.
What is the technology of Panasonic HIT?
Our solar panels are made using Heterojunction technology. This is a solar cell technology that we invented back in 1990 and sell in mass production since 1997.
This technology reaches very high efficient energy conversion, low losses with higher temperatures, and helps manufacture very reliable cells for long term operation. Up to this date (2015), no other company has been able to produce and sell with this technology in big quantities.
Why should I pay more for a solar system of Panasonic HIT?
The purchase of a solar system for your roof is just the day one of the long life of a reliable product on your roof. Solar panels have to work every day, 365 days every year, to satisfy the initial plan of return of investment that made you install those panels.
We offer the value for your money of the highest-quality solar panels on the market, with a proven guarantee claim rate that is unrivalled. Beyond that, you have the guarantee backed by a company that has existed nearly 100 years and has photovoltaics as one of many business areas- if we look 25 years back, most of the companies that made solar then are no longer active. Our guarantee is however and will be still valid.
On top of this, our solar panels deliver more power on your roof due to the high efficiency- you can save more from your electrical bill if your roof space is limited.
How long does a solar panel last?
We give a guarantee on the yield of the solar panel of 25 years- that is how sure we are about the long-lasting performance of our products. It is reasonable to expect lifetimes around 30-40 years of operation. The quality of the components, such as backsheet or soldering is the key for long-term operation and we use only the best materials available.
What is the cost of a solar system?
The cost of a system depends on the size of the system and on the configuration. Difficult roofs may increase the cost, and there are many possible electronic gadgets to, for instance, manage and control the performance of your array. Last but not least, high quality solar panels are frequently more expensive budget options. Please ask for a quote from a qualified installer in your area.
How does shadow affect the solar system?
Because of how solar panels are made, a small shadow can already reduce the output power of a single module. However, modern inverters can handle this and a well designed system will perform well even with shadows. However, if you have a roof object such as a satellite dish, it is convenient to leave enough space around it to avoid continuous shading. You should also think about trees or neighbour buildings. In case of doubt, a competent installer can help you calculate the impact of shadowing on your roof.
How much energy do I generate on my roof?
The amount of energy generated depends on the roof size, orientation, and location of the PV system. As a rule of thumb, a roof with 25m2 of available roof space, facing from east-south to west-south in Germany generates about 5000 kWh yearly, which is the average electrical consumption of a household of 4.
Can I generate energy in winter?
Yes. Wintertime has lower energy yields, but because photovoltaics can profit from sunshine even at cold temperatures, there is generation. Steeper roofs are better than flatter roofs for winter energy generation. Usually generation in January is about 4 times lower than generation in July, for central European countries. In southern countries, these differences are smaller.