Overcurrent protection
To ensure reliable and safe operation, it is recommended to install a suitably rated inline fuse or circuit breaker within the DC power cabling between the Blue Smart IP67 Charger and battery/batteries, located as close as practical to the battery/batteries; this is particularly important for hardwired installations.
The primary purpose of an inline fuse or circuit breaker located close to the battery/batteries (energy source) is to protect the cabling and system in the event of a overcurrent fault, such as a short circuit in the DC power cabling; a fuse or circuit breaker located in the charger unit or nearby within the DC power cabling will not provide protection from a short circuit in the unprotected length of cabling.
In the event of a short circuit in the DC power cabling between the battery/batteries and charger, the battery/batteries have the capability to provide extremely high current through the DC power cabling, which can result in severe overheating of the cabling and potentially a fire unless the battery/batteries (energy source) is promptly disconnected by a suitable fuse or circuit breaker.
Note that the Blue Smart IP67 Charger range (except for the the 12/25 model) include an inline fuse integrated within the DC power cable, however as this inline fuse is located near the charger unit it will not protect the cabling in the event of a short circuit between the inline fuse and battery/batteries (energy source).
Refer to the table below for the recommended fuse / circuit breaker rating, depending on the charger model:
Notice
The fuse / circuit breaker rating recommendations above are based on a 75% maximum normal operating current limit for the minimum fuse / circuit breaker rating and the maximum current capability of the related DC power cabling size/gauge for the maximum fuse / circuit breaker rating; these recommendations are generic and do not cover the intricacies of all installations and/or fuse / circuit breaker types, please consult a certified installer for guidance with specific and/or complex installations.