I think his SALE price includes wire, but I wouldnt assume his listed COSTS include it.
panels: $600x2 = $1200
strike = $160?
Do the panels come with power supplies and batteries? if not $50+
cable = $75 rough cost
labor? How long are you planning on this taking you? What do you pay your technicians? Add 30% for the actual loaded cost per hour. Lets pull a number out of thin air and say 2 guys 2 days and pay them $22/hour. 32 hours X $22 X1.3 = roughly $900
There are alot of assumptions here... and Im sure missing expenses.
1200 + 600 + 160 +50 +75 +900 = $2985 projected cost.
If you are charging $5500, then (5500-2985)/5500 = 46% margin on the whole thing.
Im not the guy to ask if this is reasonable, because I think the entire industry is undercharging.
Alternative that some people will say is impossible:
Hardware cost: $2085 * 1.85 = $3857 @ 46% margin on parts
Labor cost 32 hours X $120 = $3840 @ 77% margin on labor
total sale: $7697 @ 61% margin
I think this is unreasonable, but mostly because it should not take 2 guys 2 days to do this, but the margins themselves are not unattainable.
DO NOT TRY TO JUMP INTO THIS TYPE OF PRICING IMMEDIATELY, IT WILL KILL YOUR BUSINESS IF YOU TRY TO RAISE YOUR PRICES BY 40% PLUS IN ONE SHOT. TO DO THIS YOU ALSO HAVE TO PROVIDE MASSIVE VALUE AND SERVICE TO BOTH THE CLIENT AND THE EMPLOYEES. BUT THE FACT REMAINS, YOU DONT KNOW HOW MUCH IS TOO MUCH UNTIL YOU LOSE A JOB. Raise your prices in small increments in a measured way one job at a time until you reach a point of pushback, then back off a bit.
I'll go put my flame suit on now.