The BMV monitors the voltage and current of a single battery bank and calculates power, state-of-charge, and time-to-go. The BMV-702 features an additional voltage input that can be used to measure an auxiliary or starter battery voltage, midpoint voltage or temperature with the optional temperature sensor. Data can be transferred to smartphones or computers with the optional Bluetooth dongle and external alarms can be triggered with the relay contact.

Installation is simply a case of connecting the supplied shunt in the negative battery cable, mounting the monitor in a 52mm diameter hole and connecting the wires. An optional wall enclosure is available if surface mounting is preferred. 

How to set up a Victron BMV Battery Monitor for lead and lithium batteries