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Hey guys, I recently started having a string of fermentations stop at about 5% instead of the typical 10%. I've spent a week racking my brain for the cause and can't come to any conclusions. Any ideas or thoughts? Below are more details about the fermentations and attached is our latest water quality report. I appreciate any advice or suggestions. Details (2) 650 gallon fermentations with only 5%abv. I assumed it was something competing with the yeast so I completely tore down and cleaned/sanitized the fermenters...then mashed 2 more 650 gallon batches with the same result. The grain is from the same supplier we've used for years and looks, smells, and tastes the same prior to mashing-Grain is also milled off-site to a fine powder Mashing temps were typical and conversion was on par with an OG of 1.068 The same yeast we've used for years was pitched at the recommended temp and the fermentation looked normal for days 1 and 2. After day 2 activity dropped off drastically and i left it for another 3 days (total of 6 days). When checking the abv the final gravity was 1.038 For 1 batch I pitched additional yeast after day 3 and got a little more activity but negligible difference in abv. 1,200lbs of grain for 650 gallons of mash. grain bills used were a wheat/rye and an all corn recipe. Both with the same result Fermentation temperatures were in the acceptable ranges for the first 4 days. Fermentation smells and taste the same for the first 2 days then the flavor/scent never fully develops. Any help at this point would be appreciated as we're running at 50% efficiency....not the most enjoyable. Thanks Jon. 711316.pdf
I was surprised that I could not find a similar (accurate) equation online, so thought maybe others might find this useful. I recently wrote it as part of a mashing spreadsheet for a client. It allows you to calculate target Original Gravity (OG) by plugging in your target A%V and expected Final Gravity (FG). The only equations/calculator I could find used FG and OG to calculate ABV. This equation can be pasted into a spreadsheet; just substitute FG and A%V for the appropriate cells (assuming I typed it correctly here). OG=(1521600*(FG^2)+(28187*A%V*100))/((1521600*FG)+(15880*A%V*100)) I used the following 2 equations from: Brew by the Numbers by M Hall from Zymurgy Summer 1995 A%W = ((76.08)(OG-FG))/(1.775-OG) A%V = (A%W)(FG/0.794)