Not using any kind of protection system (dont know what G83/1 is)

If you`re not looking to "export" any excess generation capacity it
won`t apply to you afaik - although if you plan to hook it up to your
existing wiring so that it may potentially backfeed onto the mains
network it probably would apply :-} ?!? but depending on location and
who your supplier and / or network operator is, different rules may
apply.

One of the first hits in google gives...

http://www.actionrenewables.org/grid.htm