SPK are autonomous solar power systems, capable of feeding up to 10 n.m. range beacons.The design of their different configurations make it suitable for feeding both shore and sea installations. Its low installation and maintenance cost makes them suitable even for sites in which electrical commercial lines are available.Its battery box, which also contains the charge regulator, is made in exceptionally resistant and durable composite. This provides the kit with an extraordinary service life in very adverse marine environments.