Original gravity

How to get most out of brewing with your Braumeister? Help others and share your tips/best practices.
Maxbrewer
Posts: 13
Joined: Sun Feb 14, 2016 8:51 am
Model: 20 litres

Original gravity

Unread post by Maxbrewer »

I have a question. I’m really struggling to hit my original gravity. My pre boil gravity is never an issue. I’m normally within a couple of points. I even boiled for 90 minutes and still can’t hit my original gravity. I’m hoping someone might have some advice.

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Cristian
Posts: 196
Joined: Wed Apr 05, 2017 8:19 am
Model: 20 litres (2015)
Location: Vienna

Re: Original gravity

Unread post by Cristian »

Depending on your software, check the evaporation rate.
OG is dependent on this parameter. You may not have vigorous boil so the evaporation rate is lower than what is inserted in the brewing software. This way you will lose less water than planned and have lower OG vs planned.
Are you using a dome? This helps the boil a lot
note down your preboil volume, your final volume before chilling and insert this number (Preboil volume - final volume) in the evaporation rate section.

Maxbrewer
Posts: 13
Joined: Sun Feb 14, 2016 8:51 am
Model: 20 litres

Re: Original gravity

Unread post by Maxbrewer »

I’m using BeerSmith and I get a great rolling boil with the hood. I did an experiment with water, measuring volumes before and after and I only lost just over a litre

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Cristian
Posts: 196
Joined: Wed Apr 05, 2017 8:19 am
Model: 20 litres (2015)
Location: Vienna

Re: Original gravity

Unread post by Cristian »

approx 1L in 60 minutes is very low. not sure why. maybe somebody else expericence this
did you check in BeerSmith the "Boil off" parameter? is it correct?
Last edited by Cristian on Tue Jan 29, 2019 10:55 am, edited 1 time in total.

Maxbrewer
Posts: 13
Joined: Sun Feb 14, 2016 8:51 am
Model: 20 litres

Re: Original gravity

Unread post by Maxbrewer »

In BeerSmith you only have the option of plugging in an hourly boil off rate.

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Cristian
Posts: 196
Joined: Wed Apr 05, 2017 8:19 am
Model: 20 litres (2015)
Location: Vienna

Re: Original gravity

Unread post by Cristian »

and what is this number in your case?
this number should be the same with what you tested (better test with wort than water as it may differ slightly)

Maxbrewer
Posts: 13
Joined: Sun Feb 14, 2016 8:51 am
Model: 20 litres

Re: Original gravity

Unread post by Maxbrewer »

BeerSmith is telling me 1.89 litres per hour

Maxbrewer
Posts: 13
Joined: Sun Feb 14, 2016 8:51 am
Model: 20 litres

Re: Original gravity

Unread post by Maxbrewer »

With the recipe in question BeerSmith estimated 1.071 and I got 1.060

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Cristian
Posts: 196
Joined: Wed Apr 05, 2017 8:19 am
Model: 20 litres (2015)
Location: Vienna

Re: Original gravity

Unread post by Cristian »

In my opinion you should check again your profile. Your BM 20 profile in BeerSmith may differ a lot to another user using the same equipment. This is due to temperature, altitude, local ingredients, skills etc
BeersSmith and any other brewing software will use standard or average parameters for boil off, chiller loss and other. It is important to adjust the software according to your own numbers. (boil off, grain and hop absorption)
Brew 2 times the same recipe and measure all during first batch. Update you profile and brew the recipe again. you should be “calibrated” afterwards.
You may also try using more BM friendly software like Brewfather of Brewers Friend.

f00b4r
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Joined: Mon Jul 21, 2014 6:49 pm

Re: Original gravity

Unread post by f00b4r »

Also make sure you give a really good stir before taking your pre boil and post boil gravity readings otherwise they can sometimes be misleading.

Maxbrewer
Posts: 13
Joined: Sun Feb 14, 2016 8:51 am
Model: 20 litres

Re: Original gravity

Unread post by Maxbrewer »

I plugged the same recipe into brew father using the braumeister equipment profile and instead of suggesting 25 litres as the strike volume from BeerSmith, brew father suggested just over 23. I wonder how much 2 litres would change the OG

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johnrm
Posts: 159
Joined: Wed Dec 10, 2014 8:12 am

Re: Original gravity

Unread post by johnrm »

You could be out by 8%.

Maxbrewer
Posts: 13
Joined: Sun Feb 14, 2016 8:51 am
Model: 20 litres

Re: Original gravity

Unread post by Maxbrewer »

I wonder who’s right then when it comes to calculating strike volume, BeerSmith or brew father

IPA
Posts: 272
Joined: Tue Feb 25, 2014 8:16 am
Model: 50 litres
Location: France

Re: Original gravity

Unread post by IPA »

Maxbrewer wrote:I wonder who’s right then when it comes to calculating strike volume, BeerSmith or brew father
Are you achieving the correct final volume at the wrong,lower, gravity or are you ending up with a larger volume at a lower gravity?
For the record I have never used brewing programme and always end up spot on.

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Cristian
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Joined: Wed Apr 05, 2017 8:19 am
Model: 20 litres (2015)
Location: Vienna

Re: Original gravity

Unread post by Cristian »

I doubt you matched the profile in BS with the one in Brew father 1:1. (you have much more options in BS as its specialized for 3v systems). So it’s normal to have 2 different results.
Why do you bother with strike water volumes? Ad 25L +sparge or mash full volume (30L) and adjust grains and hops to your desired OG/FG/IBU

Maxbrewer wrote:I wonder who’s right then when it comes to calculating strike volume, BeerSmith or brew father

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