Victron Energy Battery Monitor BMV-700
The Victron Energy BMV-700 is our high precision battery monitor. The essential function of a battery monitor is to calculate ampere hours consumed and the state of charge of a battery. Ampere hours consumed are calculated by integrating the current flowing in or out of the battery.
Comes with shunt and 10m shunt-to-monitor connection cable
To read more about the full BMV range & accessories, see this blog.
Not good setup instructions