Roughly, 600 Amp-hours at C/10 charge rate is 60 Amps of charge current.
(you 'could' use less current, but that's a good number, generally)
It's a fairly typical battery size for a 12V system pretty much. I've seen
much bigger (way too big IMHO). It really all depends on your energy needs, but
most people make do with what they can afford and what they have at the moment.
At 12 Volts, this is 60Amps X 12Volts = 720 Watts of PV (STC, or nameplate rating)
Actual output is normally somewhat less than this (~20% less)
You'll most likely want an MPPT controller for this one.
OutBack MX60, Apollo T80, Xantrex XW60, MidNite Classic (coming soon I hope),
and maybe some others out there...
boB