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Robobrew sparge water calculation

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5 months 1 week ago #3792 by Will2233
Robobrew sparge water calculation was created by Will2233
Hello,
I have been doing a few brews on a Robobrew v3.
I have used Gash's Robobrew profile but seem to have too much wort in the vessel after sparging.
I typically end up with 30 plus litres of wort pre boil which is always very low on specific gravity, before sparging it is around the beersmith estimate but after sparging comes in around 1.005 or so.
After the boil I also seem to have over the Beersmith estimate going into the fermenter.
Can some one point me into where I might be going wrong.
I hope this makes sense.
William

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5 months 1 week ago #3793 by Gash
Replied by Gash on topic Robobrew sparge water calculation
I was just explaining something like this to some one else on youtube, its a hard thing to judge, many different variables. Firstly did you change the grain absorption amount in the advanced settings?
Also you can enter in the mash profile what preboil volume you want, this will work out your water amounts, but they can still vary due to a few different things.
What batch size do you usually aim for? What sort of boil off are you getting?

Personally I keep it simple, I want 23 and 24L batches, for 23L batch I'll sparge till just over the 29L mark, for 24 I sparge till the 30L mark (60min boils)
Cheers

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5 months 1 week ago #3802 by Will2233
Replied by Will2233 on topic Robobrew sparge water calculation
Hi Gash,
Thanks for your reply.
My grain absorption rate is set at 0.96, I,m not aware of having changed it.
I try for the 23 to 24 L batch, usually 23L.

If by boil off do you mean what I start with and what I end up after the 60 minute boil, I think around 25 or so liters as indicated on the Robo markings
I think I will follow your advise and only sparge to the amounts you are indicating.
The last brew I did I sparged with the Beersmith recommendation of 18.22 liters which went to just over the 30 L mark which would have gone close to 32L.
It was for a 23 L batch.

I feel 1 of the setting must be out causing BS to calculate incorrectly.
Is it just a case of sparging to your recommendations and ignoring BS?

William

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5 months 1 week ago #3805 by Gash
Replied by Gash on topic Robobrew sparge water calculation
What about the grain absorption rate of the BIAB setting?

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5 months 1 week ago #3806 by Gash
Replied by Gash on topic Robobrew sparge water calculation
Actually scrap that comment. Have you weighed your water measuring device? I bought a scientific jug and it was out by 200ml on 2L, my water HLT was way out and so I carefully weighed out the water and made my marking using that.
I just used the profile again today and it was fine.
Dont leave the grain basket dripping if you are going over your the 30L mark, just pull it off.
Just gotta run my boil alarm is going off. We'll work it out mate.

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5 months 1 week ago #3807 by Gash
Replied by Gash on topic Robobrew sparge water calculation
Go into the profile setting and uncheck this box, if its checked, then you can change the boil volume amount. To whatever you want your preboil amount to be, for me its 29 for 23L or 30 for 24L, I still usually pull the basket before its completely stopped dripping. So many variables in brewing from different grain absorptions and we all get different boil offs.
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5 months 1 week ago #3808 by Gash
Replied by Gash on topic Robobrew sparge water calculation
What do you have your BH efficiency set too? Maybe drop it lower to 76 if you're higher than that.

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5 months 1 week ago #3809 by Will2233
Replied by Will2233 on topic Robobrew sparge water calculation
Hi again,
I just weighed my measuring jug and at 3 liters it is under at 2.90 kg.
I think the secret for me is to not let the sparge water calculation rule how much water I use to get the final pre-boil volume.
Thanks for your help,
William

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5 months 1 week ago #3810 by Will2233
Replied by Will2233 on topic Robobrew sparge water calculation
I missed your other replies.
I have altered the profile to your recommendations
I'll let you know after the next brew which will probably in a weeks time.
William.

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5 months 1 week ago #3812 by portas1971
Replied by portas1971 on topic Robobrew sparge water calculation
Hey Will, I too have had issues with sparge water calcs in Beersmith in respect to the Robobrew Gen3 35L.

I am using a Mac desktop version and iOS app on my iPad of Beersmith 3 and when I printout recipe for brewday from the desktop version, the sparge water calculations differ by over 2 litres when I open up the same file in the cloud on the mobile app (iPad) to use as a brewday timer. Beersmith bug!!! Incidently, the mobile app is correct, not the desktop version. Took me a few brews to notice this bug in BS!

I brew 23lt batches and now sparge up to 28.3lt, which has been consistent over 3 brews in bottling 21.5lt, 21.9lt and a cube full to the brim. See attachment. Hope this helps you out.
Cheers, Andrew
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Drunken Ramblings

Finnroo's Avatar Finnroo - Thu 11 Jul - 14:09

Just finished a good brew day, brewing an English Bitter or maybe it s a pale. Did a starter seemed to go well. But my picnic tap on my keg snapped so had to use a pair of plyers to pour. Nice n foamy :D

Gash - Sun 7 Jul - 09:45

Think you'll find the others will be like the grainfather app if they are set up correctly.

Keg - Thu 4 Jul - 20:15

Hi everyone, just wondering why the likes of BS, Brewfather ect specify a lower strike water volume than the sparge volume? The only one that does not is the Grainfather app.

Finnroo's Avatar Finnroo - Thu 20 Jun - 12:38

Very cold brew day in the shed. The fog is down to about 3 feet. ha. :O

Kegga - Sat 15 Jun - 22:23

Thanks drewtech ?

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