Down to Earth Questions?

I am installing a Sunsynk 12k 3phase inverter with 4x5k BSL batteries, on a DB that has a PE coming in from the municipality.

There seems to be a lot of debate as to what the requirements are for earthing different components of my system, most of which concern the use of an additional earth spike.

I am approaching it the following way, but there are a few questions:

Non Essentials : DB to sunsynk - use municipal PE bar on DB

Load: Sunsynkto DB - use municipal PE bar on DB

Earth Neutral Bond connector in Island mode - I am assuming the PE remains functional even during load shedding so I can connect to the PE bar on DB? or should I create a separate earth Spike for this?

BSL batteries case - use municipal PE bar on DB? or should I create a separate earth Spike for this? Unlikely that there should be a fault, but I'm not sure if a surge of DC down the PE will do any damage to the inverter or DB?

PV Array surge protector - use municipal PE bar on DB? or should I create a separate earth Spike for this? I'm not sure if a surge of DC down the PE will do any damage?

Solar panels frames - I know this should be on a separate earth spike. I live in a low lightning area, and the panels are on a metal roof with lots of downpipes, one of which goes into the pool. So I would assume this acts as a earth for a possible strike.