For a down and dirty calculation of capacity:
Take total fermentation capacity: 3 x 15 bbl. = 45 bbl. times 365 days in a year divided by cycle time.
Three Unitanks: (45 x 365)/14 day cycle = 1173 bbl. max. annual production
Five Unitanks: (75 x 365)/14 = 1955 bbl. max. annual production
or an average of 391 bbl/year per 15 bbl. unitank maximum.
These estimates are max. production. To hit these #'s you need to have a proper amount of serving tanks/cooperage/packaging to turn the tanks every 14 days.
Cheers & I'm out!
David R. Pierce
NABC & Bank Street Brewhouse
New Albany, IN 47151