I've completed my second BIAB (All grain) yesterday. Everything went well but I ended with an OG of 1.046 @70F instead of 1.065.
I've included my BIABacus file but unfortunately I couldn't fill the volume informations as my new kettle has no water level indactor (I will solve this issue before my next brew).
I would like to have your advice for my next batch. Here's a few info :
I computed the recipe in BIABascus planning to mash with 30L water then add 3L before boil without sparging. As my previous batch ended way under the recipe OG, I decided to use the 3L water to fly sparge my grain on removal. Afterward, I sqeezed the bag had let it drain for 20 minutes and added the extra wort to the boiling kettle.
I started and ended with the exact amount of water/wort estimated by BIABacus, which make me belive that my lower OG is not because of an insufficent evaporation.
Unfortunately, I didn't measure the gravity into boil (GIB)... I could've spotted that the wort was below the estimated gravity and increase the boiling time/hop addition timing.
Here's a list of a couple thing that I've noted on different threads but I am wondering is it really what made my OG 18 points below my target?
-I did not let my bag drain long enough (next time I will let it drain until the last 15 minutes of boil)
-I did not perform a mash-out
-I added my grains when the watter was at 158F and it lowered the temperature to 152F (I was aiming 150F). The wort ended at 147F after 90 mashing time with a slight reheat that did not overshoot.
-My local brewing vendor milled the grain for me. I will ask them if they suggest me a finer mill
-Maybe it is something as dumb as I did not mix the wort adequatly before taking my gravity sample? (I whirlpooled the wort, let it stand 15 minutes and too my sample on the top layer of wort by taking care of not taking hop residues)
Should I try to fix these parameters as well as increase my grain bill for my next batch?
Thank you,
Krown
