No I haven’t created an installation guide for the Pi yet. You will need some knowledge of configuring Raspbian (adding modules to PHP for instance and setting up cron jobs) in order to get it running. You will also need an external Postgres SQL server (which the code has been written for, it should be able to be ported to other SQL servers) as running an SQL server on an SD card is not a good idea (I have my Postgres SQL server running on a QNAP NAS).
From memory, the minimum additional PHP modules/extensions you need are (assuming you have a Postgres SQL server):-
I am not a Raspbian/*nix expert by any stretch of the imagination and learning as I go (my area of expertise is Windows Server), but I will try to help if I can. Mike may also be able to provide some help as he is a *nix (Debian) expert. I have had the code running on my Pi now since January 2019 and it works very well (the only issue is the reliability of the SolaxCloud Portal, which is rubbish to put it mildly !)