Electric Brewing Supply 30A BCS Giveaway!

Home Brew Forums > Home Brewing Beer > Electric Brewing > Two Ferm Wraps connected to one controller?
LinkBack Thread Tools
Old 04-30-2013, 07:27 PM   #1
Feedback Score: 0 reviews
Join Date: Apr 2013
Location: Salt Lake City, Utah
Posts: 1
Default Two Ferm Wraps connected to one controller?

I apologize if this has been covered and I missed it. I promise I looked, albeit very quickly.

I'm curious to know if anyone has experience connecting two Ferm Wraps to one controller? I'm moving from 5-gallon batches to 10-gallon, and I'd like to be able to simply buy one more Ferm Wrap and avoid the cost of another controller. I believe the Ferm Wraps only use 40 watts, so I assume it'd work just fine... but I bring this up in case there's something I'm missing!

rottencommie is offline
Reply With Quote Quick reply to this message
Old 04-30-2013, 09:41 PM   #2
Feedback Score: 0 reviews
Join Date: Aug 2012
Location: Bozeman, MT
Posts: 7
Likes Given: 1


I've done it using a power strip for 10 gallon batches in two different carboys. Seemed to work fine. Watched the fermometer on both carboys and they stayed at the same temps.

ben13 is offline
Reply With Quote Quick reply to this message
Old 05-03-2013, 11:53 PM   #3
Feedback Score: 0 reviews
Namako's Avatar
Join Date: Aug 2007
Location: Eagle River, Alaska
Posts: 121
Liked 10 Times on 5 Posts
Likes Given: 1


I do it routinely, using a small outlet expander (expanding 1 outlet into 3 outlets). The only issue I occasionally worry about is that whichever one of your carboys has the thermocouple attached is the one that gets to decide whether BOTH Fermwraps are on or off.

The scientist in me says that it is incorrect to assume that the fermentability of the wort in both carboys is exactly equal ("exactly" being the operative word), since the volumes came from different parts of the kettle. Even the yeast pitch into the two carboys HAS to be different, even if it comes from the same starter flask, because even IT stratifies a bit in the time it takes to get from the stir plate to the carboy mouth. I always allow my wort to settle down for 30-45 minutes after I stop the chill/whirlpool cycle, so I'm sure more than just hops and trub are settling down; I'm surely getting some sort of stratification going on as well.

That said, I still do it, and I cannot discern the differences between the two volumes. I maintain their separability all the way to the keg, and can't tell the difference between the kegs. I guess if I were REALLY worried about it, I could blend the two volumes together before I kegged them, but that would expose the now-finished beer to oxidation, and THAT worries me even more!!

I need a homebrew... I'm worrying too much...



Indecision... may or may not be my problem... I'm not sure

Primary 1 - Empty
Primary 2 - Empty
Kegged: Empty
Planned: Maerzen, Maibock, and a Kellerbier/Zwickle
Coming Soon: An upgraded Blichmann 20-gallon, Kal-inspired, BCS-controlled, all-electric RIMS-based pico-brewery (by mid-Summer 2015, after the winter thaw, and the NHC, I swear!!)

Reason: Thought of yeast...
Namako is offline
Reply With Quote Quick reply to this message
Old 05-04-2013, 12:23 AM   #4
Feedback Score: 0 reviews
Join Date: Jul 2010
Location: Albany, NY
Posts: 1,911
Liked 113 Times on 85 Posts
Likes Given: 67


You could probably use 10 or 20 ferm wraps with no problems. which controller do you have?

grathan is offline
Reply With Quote Quick reply to this message
Old 05-06-2013, 11:45 AM   #5
Basement Brewer
Feedback Score: 0 reviews
BadNewsBrewery's Avatar
Join Date: Oct 2012
Location: Severn, MD
Posts: 1,141
Liked 115 Times on 94 Posts
Likes Given: 54


I do it if I have 2 batches going at the same time. Even with totally different beers - not splitting a 10gal batch in half. I've never noticed a problem. Sure, there may be slight variations in temp between the two carboys, but it's better than nothing and still results in tasty beer.

Building a Bad News Brewery - eHERMS

5gal Scottish Wee Heavy
5gal Saison
15gal American Pale Ale
20gal Belgian Wit
10gal Oktoberfest
10gal Southern Pecan Ale

Keg 1: Apfelwein
Keg 2: Oktoberfest
Keg 3: Southern Pecan

On Deck: Winter Spice Ale
BadNewsBrewery is offline
Reply With Quote Quick reply to this message

Quick Reply
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
temp controllers and multiple ferm wraps jbeukelman Equipment/Sanitation 7 09-21-2011 01:25 PM
ferm chamber temp controller ??? edsrockin DIY Projects 8 03-11-2011 11:38 PM
Ferm. chamber with temp. controller brian74 General Techniques 8 01-23-2011 08:49 AM
Temp controller for Ferm chamber. Cazamodo DIY Projects 8 01-07-2011 04:58 AM