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First 10 gal batch, low OG too dilute

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JMetzz

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After about 3 years of partial mash brewing, I decided to upgrade to all grain brewing. My first batch came out perfect (high gravity stout), but I think mostly attributed to beginners luck. My next batch, a 5 gal IPA came out good, but I boiled off too much and had a larger than expect OG, so I ended up topping off after boil.

The batch I made last night was supposed to be a 10 gal milk stout. This was my first 10 gal batch. I did not intend to make that large of a batch, but being an all grain beginner, I totally missed that the recipe had said 10 gal until after I milled all the grain. This forced me to go buy a 60 qt kettle, which I needed anyways. Desperately searching for a preboil volume all over the internet, had me find a consensus on 14 gallons as a good preboil volume for a 10 gal batch. Everywhere was conflicting information on 10% boil-offs/hr or 1 gal boil-offs/hr. So I blindly trusted the 14 gal preboil, sparged to that volume and started the boil. I ended with ~12.7 gal? and 1.050 OG vs 1.060 OG. Being very exhausted, didn't think about and chilled the wort, pitched yeast, etc.

This morning, I am wondering if I totally F'd my beer by not boiling down to close to 10-11 gal. The beer does have 2 lbs of lactose in it overall, which should help with the body, but I am not sure if it will keep it from being too watery. I am thinking of leaving it in the primary for 4 weeks and the secondary for another 4 to try to evaporate as much as possible. Some people say add malt extract to up the gravity? Or should I just bring it back to the kettle and try to boil off 2 gallons? My friend said this will mess up the hop character, although I boiled in with hop bags and already removed those. I would need to make a new starter, however.

Messing up 5 gallons is fine, but 13 gallons is gonna be a long time of drinking piss. Help save my beer!!
 
You aren't going to evaporate anything in the carboys, that doesn't happen.

I don't think it'll be as bad as you're thinking.
 
Why not? Since it was high OG to begin with? I did put 22.5 lb of grain in...

Still ~13 gal vs ~10 gal is a 23% difference in volume and concentration. I don't understand how it wouldn't be watery.
 
My preboil volume for 10 gallon batches is 13.3 gallons.
I usually end up with about 11.75 in the kettle post boil, and about 10.5 for the fermenter(s).
 
Maybe I'm missing something.. how do you lose 1.25 gal when going to the fermenters. Do you mean after fermenting..?
 
There is some loss due to kettle trub absorbing wort. Depending how much kettle hop additions you did, there may also be a significant amount of absorption there too.

My kettle will not drain out 100% of my kettle volume. Usually I have between 1 and 1.5 gallons of mess in the bottom of my kettle that doesn't make it into fermenters. I account for that in my recipe building though.
 
A 10 point difference will not make a huge difference in the beer IMO. It will be a bit lighter than anticipated, but this gives you an opportunity to brew it again correctly and compare the two.
 
Maybe I'm missing something.. how do you lose 1.25 gal when going to the fermenters. Do you mean after fermenting..?

I don't put any hot break or hop matter from kettle additions into my fermenter. That usually accounts for a little over a gallon of my final volume depending on the recipe.
 
It should be ok. Being off 10 points really isn't that bad. I wouldn't reboil or try anything else. The flavors should still be there.

What I would recommend is find a good easy drinking recipe that is around 1.040 - 1.050 and brew it multiple times to get your system down. If you keep accurate notes you will know exactly how your system works and you won't ever run into these issues again. When you brew higher gravity beers you will lose efficiency but it is more predictable if you know how your system works on regular gravity beers.
 
Okay, I boiled the hops in bags to refrain from having to filter the wort later on. I lost about 0.5 gal from other sediment. I am guessing that 12 gal went into the fermenter. I guess I will lose about a gallon or so due to trub, so I am not terribly off.

Thank you for encouragement about 10 points off not being a big deal. As summer is around the corner, I probably need a lighter beer anyway!

The idea about brewing something simple over and over is a good idea, I just have trouble damping down my crazed excitement when it comes to complex wild beers.
 
Another quick question - do you generally fix the pre boil volume or the pre boil OG? This is really where I am getting confused.

It seems hard to dial both. I am generally seeing 1 gal/hr boiled off and 10 points increase/hr?
 
Another quick question - do you generally fix the pre boil volume or the pre boil OG? This is really where I am getting confused.

It seems hard to dial both. I am generally seeing 1 gal/hr boiled off and 10 points increase/hr?

My personal preference would be to get the pre boil OG correct. If you get all the wort into the kettle and OG is low then just boil down till you hit the correct OG unless you are terribly off. I would rather have 9 gallons of a beer that tastes how it is supposed to rather than 10 gallons of slightly diluted beer.
 
It all depends on your boil off rate. If you use beersmith they have a calculator that allows you to input all the figures given you know your boil off rate. The calculator is estimating 10 points in an hour on a 6 gallon pre boil going to 5 gallons.

But what I was trying to say is lets say you are shooting for a 1.050 pre boil gravity but it comes in at 1.045. You boil the wort until you get to 1.050 then start the 60 minute hop addition.
 
Gravity and volume are tied. 1 gallon of 1.050 wort would be 1/2 gallon of 1.100. Similarly it would be 2 gallons of 1.025.
 
Okay and about how many points do you gain for a 60 min boil? 10?

Also based on your original volume:

1 gallon boil off on 5 gallon almost 20 % on a 10 gallon around 10%

So it may yield you 10 gravity points in the first case only 5 on the second.
 
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