The Octo GX is the communication-centre of your installation. It connects the components together and ensures they are working in harmony. Monitoring of live data, and changing settings is performed by using your smartphone (or other device) via Victron's free-to-use Victron Remote Management Portal, VRM.
The Octo GX is a member of the GX Product family. The Octo GX is the best fit for installations that have many MPPT Solar Chargers, as it has 10 VE.Direct ports.