Only done a few so far Matched, 9.8kWp being the biggest (although quoting for 35 an 40's). so far its been two roofers, (one whos been on a PV course), and myself.
With three someone is available to help inside and out, lifting inverters into lofts, panels onto roof. Two as an absolute minimum, definately not a one man affair. Four might come in usefull when you have a bit more A/C to pull in.
 
Standard domestic install team is three, qualified roofer, qualified electrician, gofer.

Commercial systems totally dependant upon timescale and available resources.
 

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