Need some help determining my efficiency

[lawle102]

Ok, so I did my first All Grain BIAB this past weekend and I shot for the stars and tried knocking out 10 gallons of beer in a 15 gallon kettle.

My bag and hoist handled it fine, the burner was an issue but I got it to a boil.

But my efficiency is something I am wondering about. I bought a Monster Mill 2.0 and milled all my grains once. I only did them once because it looked to produced some flour like dust and I didn't want to over do it.

I mashed at 154 for 90 minutes. I hit my temp spot on using the simple BIAB Calculator and I have a insulation jacket I made for my kettle.

My Pre-boil gravity was 1.034 and my post boil gravity was 1.050. That seemed like an awful low preboil gravity but in the end, I actually overshot my target final gravity of 1.046.

Can anyone shed some light on what my efficiency should be?

Below is my grain bill. I doubled the amounts to make a 10 gallon batch.


7 lbs Pale Malt, Maris Otter (3.0 SRM) Grain 1 70.0 %
1 lbs Munich I (Weyermann) (6.0 SRM) Grain 2 10.0 %
8.0 oz Aromatic Malt (Dingemans) (19.0 SRM) Grain 3 5.0 %
8.0 oz Barley, Flaked (Briess) (1.7 SRM) Grain 4 5.0 %
8.0 oz Caramel Malt - 20L (Briess) (20.0 SRM) Grain 5 5.0 %
8.0 oz Caramel Malt - 60L (Briess) (60.0 SRM) Grain 6 5.0 %

 

[helibrewer]

I don't know of a way to tell you what it should be, but if you hit your OG and ended up with the proper amount going into the fermentor, it really doesn't matter what that number is. This article may help you find your answer: Understanding Efficiency

 

[bdh]

Plugging in your recipe over on hopville (http://beercalculus.hopville.com) gives an efficiency of about 70%.

It's pretty straight forward to calculate efficiency by hand, but you'll need to lookup the sugar content of the grains you're using first:
http://www.howtobrew.com/section2/chapter12-5.html

How long did you boil for? Those pre/post boil gravities means you had a 14.7gal pre-boil volume.....

 

[lawle102]

Plugging in your recipe over on hopville (http://beercalculus.hopville.com) gives an efficiency of about 70%.

It's pretty straight forward to calculate efficiency by hand, but you'll need to lookup the sugar content of the grains you're using first:
http://www.howtobrew.com/section2/chapter12-5.html

How long did you boil for? Those pre/post boil gravities means you had a 14.7gal pre-boil volume.....

And that is about right for what I mashed with. Once I removed the grains I lost about 1.5 gallons or so after a hard squeeze