PV panels Local storage
It is also important to consider that solar cell systems may utilise a local battery storage system to store energy for use by a building when there is no sun. These are typically (wall mounted) lithium-ion battery systems and have the capacity to power a home for several days. The Tesla unit, popular in the USA, provides yet another hazard. A Tesla Powerwall combines the solar energy
to charge the battery unit and independently power the home day and night. During the day, solar panels may produce more energy than the home uses. Powerwall units store that excess solar energy and makes it available on demand, even after the sun has set. In addition, some solar cell systems have a connection to the local electrical grid in order to feed power into it, so all switches, connections etc must be disconnected to ensure overall safety.
Training needs
The growing popularity of solar cell systems calls for an increase in training for fire service/ department personnel to ensure safe operations. As well as studying the relevant standards
and codes that are in existence, both building and electrical training is called for, along with recommendations for upgrading such material. Different jurisdictions will have a variety of standards, codes and so forth to comply with and use, while many sources of information on solar installations are available via the internet, some of which will be specific to location. While the frequency of fire problems with solar
cell installations has been low, they do occur. Just recently, Walmart has been engaged in suing Tesla over seven solar panel fires at its stores. With the type of panels in question installed on more than 200 Walmart stores, the company is seeking damages for the fires, along with the removal of all of these systems. Yet as solar panels are clearly here to
stay, a greater awareness of their potential risks, safety surveys, the study of existing and proposed fire codes, pre fire and emergency plans, and consultation with installers and power companies are all of paramount importance
Kirk Rosenhan is fire services coordinator for Oktibbeha County, Mississippi, USA. For more information, view page 5
FOCUS
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