A battery monitor is an essential part of your van’s electrical system and this is one of the best out there!
The BMV-712 allows you to monitor all the energy (current) being consumed by things in the van or energy (current) being generated from solar or other charging methods. You can see this in both amps or watts and also monitor the the voltage of your battery bank. In addition, the unit also has a sophisticated algorithm to display the state of charge of your battery bank in both percentage of capacity remaining and remaining amp hours. The monitor can also be configured to alert you with over or under voltage alarms.
Using the Bluetooth connectivity and the Victron app, the you can log historical data including energy use, battery efficiency, deepest discharge, number of charge cycles and more.