Many solar systems use a CANBUS or RS485 bus to acquire battery status information and adjust the power usage from and to the battery accordingly. It is important that the battery is never over-charged or drained below a level which may cause permanent damage to the battery, or a very low level may prevent the system to start up again.

There are some batteries on the market which do not have a bus communication facility. This CAN-BUS BMS unit has been specifically designed to integrate those batteries with the SMA solar system.

Take note that this system is NOT a Battery Management System unit. Every lithium battery MUST have such a device build-in. The primary purpose of a Battery Management System is to protect the cells from gross destructive failures, like over-heating, fire or even explosion.