Best Approach for Monitoring Solar PV and Battery System with OpenEnergyMonitor?

[Uk_pete_2000 (Pete)]

Have you had a look at the following

https://docs.openenergymonitor.org/applications/solar-pv.html

Information can then be passed to HA via emoncms integration

Emoncms

Not sure of your inverter, but there may be a integration in HA for that