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I use a partigyle method for my multi-brew days. With a little creativity (playing with water additions to dilute first runnings, capping the mash, etc), you can actually build in quite a bit of versatility from a wort-production standpoint.
 
I do 2 five gallon batches in parallel every time. I have 2 identical setups using freestanding burners and cooler MLTs. When I'm really ambitious, or low on beer, I'll do back to back dual batches.


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I would love to try doubling up batches on brew day but my current fermentation freezer only holds 2 5 gallon buckets and since I brew 10 gallon batches I'd have nowhere to put the other two fermenters.
 
I've done a double batch with the partigyle method and by doing a large 8 gallon batch and splitting it into two batches with different yeasts. I have only one small fermentation fridge though so that was a challenge. I ended up fermenting in two corneys b/c they both fit in my fridge that way. I removed the beer-out nut and assembly and jammed an airlock in there. Worked perfectly and I was able to produce double the beer for roughly the same work/effort.

Partigyle pros - made two completely different beers, can be creative with the recipes
Partigyle cons - fermented two different beers/yeasts at the same temps, brew day took longer because I needed a seperate boil for each beer

Large batch pros - same amount of worrk/effort but end up with more beer, get to isolate what yeast really contributes to a beer (same base recipe but use different yeasts)
Large batch cons - fermented two different yeasts at the same temps, had to alter my tried and true 5 gallon recipes for the larger batch size, have a large quantity of a very similar tasting beer
 
I did three 10 gallon batches in one day once. Took about 10 hours. As soon as I had all my wort in the kettle I would fill my HLT for the next batch and be mashing before that boil was over. It's pretty crazy keeping everything on track but not all that hard.
 
Now you guys have me thinking, can I push for a double batch Friday night when i won't be able to start till 6 or 7pm :drunk:

Little shot this morn but pulled off a double brew night last night. Started heating water at 7pm. Was hosing out my kegs at 1am in the F,n freezing cold. Had to turn off n drain my garden hoses last night as it dropped into the low 20's. I HATE Winter! Can't wait for the wife to give me the thumbs up to move from this frozen tax you to death state. Tarpon fishing daily in a Fort Myers sounds so much better than leaf clean up.

Anyways an 8 gal batch of Choc Porter ran first. Going to spit it in half for second stage an add roaster pumpkin chunks to half n (don't laugh! ladies request) Candy Canes to the other half. Choc Mint Porter for Christmas n Pumpkin Choc Porter per season. As soon as I drained off the Porter into the boil pot I grabbed a hand truck n took the hot ass spent grain keg into my garden n dumped it. Thought it would be a nice fertilizer but the deer come eat it.

Crushed the grain while boiling the Porter as well as heated the next batch of sparge water. Started mashing up my Big Nose IPA. Around midnight n my fourth beer I decided don't do double batches past 6 at night.

Other than being late all went as planned. Added about an hour n a half. Well worth it. As long as I have vessels to put 2 batches in ill shoot for a double batch. Also plan on letting other use my system so this was a great timing test.
 
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