i found this the other day and it works pretty good it’s not standalone but does basically what im after.
if you have a smart meter (or connect an S0 Pulse output to the inverter) it overlays the consumption and generation
read through the thread theres a CORS plugin you need to install. he lists one for chrome and one for firefox. I setup mine so it could only access specific sites rather than leaving my whole browser open
its dark so no generation going atm