Late fermentable addition, wrong ABV

Discussion in 'Recipe Editor' started by Doddles, Apr 26, 2022.

  1. Doddles

    Doddles New Member

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    I frequently add sugar to the fermenter part way through the fermentation. I've tried using the Late Addition: Fermenter option (using the web-based Brewer's Friend). It adjusts the OG and FG fine, but the estimated ABV ends up way off (presumably because the OG is being used without taking into account the added sugar).

    Is this a known bug? I saw something similar mentioned on an earlier post (ticket #1496?) but that was supposedly fixed.

    Would also be great to have a "Late Addition" type of log entry.

    Thanks!
     
  2. Trialben

    Trialben Well-Known Member

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    I know there is a late addition function in the recipie creator in fermentables that might help
     
  3. Doddles

    Doddles New Member

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    Yep - that's what I'm using. But it doesn't seem to calculate the expected ABV correctly, given what you put in there.
    For example, if I include 1kg cane sugar for a 24L batch, as a fermenter addition it only adds 0.17 to the ABV. That is entirely due to the lower FG, not the alcohol from fermentation of the extra kilogram of sugar.
     
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  4. Pricelessbrewing

    Pricelessbrewing BF Software Manager
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    Thanks @Doddles.

    We have an existing ticket to fix this, I'm adding this forum thread to that ticket and will followup when this gets fixed. At this moment we're focusing on other issues so I don't have an ETA on a resolution at this time.
     
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  5. Doddles

    Doddles New Member

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    Thanks for letting me know :)
     
  6. Cajunbubba

    Cajunbubba New Member

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    Yes the fix should be only to the ABV, since the OG remains the same. they should just take the OG add the sugar points and calculate the ABV from that. Using my tilt I can see about a 6-7 point increase on a 6 gallon batch. see attached graph. note OG did not change but 6-7 points were added along the way.
     

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  7. Dexlor

    Dexlor New Member

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    I second this. Had a brew day where I completely missed my pre-boil gravity so I added DME to compensate. Would be nice to have a way to track that in the brew recipe rather than updating the recipe and the efficiency. I suppose this is what snapshots are for, eh?
     
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