This can drain a battery if left ON overnight. When the mechanical contacts touch, they provide a very fast transition from open circuit to closed circuit resulting in short pulse high inrush current. When switched open, the contacts spark and over time, the contacts will wear out and sometimes will not open due to sticking. There is no sparking to cause degradation of the product. 4 Solenoids or relays tend to be bulky with a non-uniform size.
Connections tend to be in multiple orientations.
In some cases, this can hinder installation and protection from shorts. The Hellroaring BIC units are compact in size and all the connections are oriented in the same way for convenient installation and protection. During extreme cold weather, solenoids or relays can fail to operate, especially if not environmentally sealed. The colder the weather, the better the Hellroaring BIC units perform. A Solenoid's contact resistance is not very repeatable.