EPSolar Tracer AN/BN devices have been around for a while so this is just another attempt to establish a good monitoring package. This project provides a comprehensive package to configure (set voltages) and query the controller, as well as to display current and statistical values in a timeline using Grafana.
EPSolar UPower hybrid inverters are the more recent addition to EPSOLAR family. They are devices combining MPPT chargers and inverters, and they are great at what they do especially in a semi-off-grid situation where AC power is unreliable. However, it is difficult to get them monitored if you have a Linux machine as they are still uncommon and the protocol is not publicly available.
Out of my communication with EPSolar I managed to obtain the list of registers and develop a UPower Python module for monitoring UPower devices.