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« **on:** April 16, 2018, 02:45:45 PM »
A couple ways to look at this. There's straightforward math: assuming this is a 1/2 bbl system, brewing 100 bbl/yr, with an average of 14 days in fermenter, you need 100*14/365*0.5 = 7.7 fermenters.

Lots of other considerations though. That's brewing more than once every other day; do you have a full-time brewer? Even if so I'd double- or triple-batch for the cost savings both up-front and in labor - a 1.5 bbl conical doesn't cost three times what the 1/2 bbl does; at those scales it probably isn't even double.

Another way to think about it is from a brewery logistics standpoint. Will you have a brink? If not you'll want to have at least one more fermenter than the number of strains in the cellar, so that you can harvest and brew on the same day without necessarily having to throw a tank CIP on top of it.