Meet the Victron Energy SmartShunt: a smart battery monitor without a display that combines with your smartphone, so you can read state of charge, remaining time, and other historical info. It has a VE.Direct port and Bluetooth connectivity. This battery monitor can be used to monitor a second battery or temperature sensor.
The SmartShunt is ideal for situations when you need battery monitoring with less wiring. It is available in 500-amp to 2000-amp. You can use it with iOS and Android devices.[where to get it]