Frequently Asked Questions
Health and Safety
Can the roof carry the additional load or do I need to replace my roof before installing solar?
Since solar PV panels have an expected economic lifetime of 25+ years and an estimated technical lifetime of 40+ years it is smart to make sure the roof is in good condition before installing the PV panels. The roof must be able to carry an additional load of approximately 20 kg/m2. In most cases the roofs are well suited for solar PV without need for any modifications. Our technical partner will work with your engineers to analyze the suitability of available roofs and land areas. If needed our technical partner will bring in specialized construction engineers to assess the roofs. If the roof needs upgrading it is typically best business for you to take care of this before the solar PV project starts. You can sign a PPA contract with Bright Sunday beforehand and we will schedule the installation so that it fits perfectly with your roof replacement project. Under specific conditions Bright Sunday can also include an investment in a new roof in the PPA price.
Is there any risk of short circuit, energy leakage or electrical shock?
There is no 100% risk free electrical system. All Bright Sunday PV systems follow local regulations, are built with CE approved equipment and include all necessary protective equipment (circuit breakers, homopolar protection and residual current circuit breakers). We also engage inspectors to validate the installation when ready. All in all, our installations are as safe as they can be.
What happens in case of PV system failure?
A PV system has multiple ways to deal with different types of disturbances or failures. All Bright Sunday PV systems have all mandatory protective equipment installed, e.g. circuit breakers and residual current circuit breakers. The inverters used to transform the DC power produced by the PV panels to usable AC power can be considered as the brains of the system. They will automatically switch-off in case the electrical network they are connected to has a power or frequency outside set tolerances. This means that in case of e.g. a grid power blackout or power spike the system will automatically switch-off. Also, the entire PV system can be switched-off manually at the main board / circuit breaker or at the inverters. This way fire fighters can be assured they can work on a roof without risk for electrical shocks in case of a fire alarm.
What is the risk of fire?
There is no 100% risk free electrical system. Fire risks are well mitigated and the risk of solar PV panels catching fire is negligible. To our knowledge there is no official percentage but according to the Fraunhofer Institute for Solar Energy Systems ISE the risk, based on 2 million PV installations in Germany, is around 0.006%.
What if any unforeseen accident happens, e.g. extreme winds makes a panel fly off?
A solar PV system is built to resist the forces of nature. For example, rooftop solar PV systems can be built with devices protecting wind to enter underneath the panels. The risk for accidents should be considered to be very low but in case the unexpected happens Bright Sunday has insurance against loss or damage of the PV system and maintains a third party liability insurance. You can sleep well at night.
Who do I call if there is an emergency?
In case of a severe accident or immediate danger to life and property you must contact the relevant emergency services. If you suspect or become aware that the PV system may not function as intended you shall without undue delay contact Bright Sunday.