Small batch sparge: any known problems?

[Jdslep]

Due to a weak (stovetop) burner, I need a boil volume of 3.5 gallons. Here is the plan:

10 pounds of grain

Mash with 3 gallons

Batch sparge with 2 gallons

Boil 3.5 gallons after 0.15 gal/lb absorption

Specifically: Can I count on that absorption even if I squeeze the grains (BIABIAC, brew in a bag in a cooler)?

I'm thinking smaller sparge volume helps keep the pH low, so no tannin problems. Does this work out in practice? Most people have sparge volume > mash volume.

 

[david_42]

Absorption won't change. Your biggest problem will be the loss in efficiency. Plan on losing 15-20% of the sugars.