Solar newbie, 2 questions on grouding and series vs parallel

Hi, I'm installing the Renogy 400W premium kit off-grid with 2000W inverter. Couple questions...

1. For grounding the inverter, is it okay to connect to my home's existing ground wiring, or do I need to have it on its own ground rod?

2.  Series vs Parallel: The 400W kit diagram shows the panels connected in series, yet I have seen many references in Renogy videos that series connections are for 24v systems. Mine is 12v. So the info is a bit confusing. If I connect my 4 panels in series, is that suitable for my 12v system?

Thanks in advance!

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