GX products are Victron's state-of-the-art monitoring solution. The family consists of the different GX products, and their accessories. The GX-device lies at the heart of the system - providing monitoring, and operating as the communication-centre of your installation. All the other system-components - such as inverter/chargers, solar chargers, and batteries - are connected to it.
The BMV (Battery Monitor Victron) range are a group of high precision battery monitors. Their function is to calculate ampere hours consumed and the state of charge of a battery.