Hi guys, sorry if this has been covered but I did not find a clear answer in the search.
I typically do standard BIAB in my 47 L (50 qt) kettle and 20.8 L (5.5 gal) wort into fermentor. I want to do a split batch and start out with as much boil volume as possible, around 41.6 L (11 gal), which should let me split about 32 L (8.5 gal) of wort.
I'm not trying to continually top up during the boil, but simply start with a full kettle. I was thinking I could mash with the maximum kettle capacity, which is (12 gal) for a 32 L (8.5 gal) batch size (into fermentor) and then use the rest of the required water volume to do a batch sparge. For example, I would plan the recipe as if I had a large enough kettle to mash at the 5 L/kg (2.4 qt/lb) water:grist ratio. Since I don't have that much volume, I'd subtract the overflow water and use it to sparge with, adding to kettle pre-boil. This means I'll have a thicker water:grist ratio in the mash, closer to 3.8 L/kg (1.8 qt/lb).
Would I need to drop my efficiency some? Or would the sparge step, likely only 7–11 L (2–3 gal) keep my efficiency where it is for typical BIAB brews? If I need to drop my efficiency how much should I drop?
My typical efficiencies are around 77–79% into kettle. Thanks, and I have read the sweet liquor shop posts!
Post #1 made 4 years ago
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