jclorden wrote:careful with the "lost to trub" number. It will throw off your efficiency calc. I set it to zero then set my batch size and final volume to the amount I want in the kettle after the boil before chilling and run off. (note that beersmith wants your batch size and final volume at the same number)
Assume 75% efficiency, 13.85G of 1.040 preboil w/ 10% boil off, leaving 1 gallon in the kettle/chiller, and I want 11Gallons in my fermenters.
Based on these numbers my final gravity should be 1.046 post-boil
However if I add the 1Gallon Trub Loss that makes my batch 11Gallons (keeping the pre-boil constant at 13.85 gallons and 1.040)
my 1.046 OG now is only 68% efficency.
That nmber is wrong. Beersmith seems to act as if the kettle loss is the same as boil off and concentrates my wort.. it want my OG to now be 1.051 - that's wrong.
I say it's easier to just leave the kettle/trub loss at 0 and formulate w/ batch size based on whats in the kettle post boil.