Author Topic: inkbird 308 question  (Read 1263 times)

Offline zman51

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inkbird 308 question
« on: June 18, 2017, 11:31:58 AM »
Hey All

Yesterday I took my chest freezer and plugged in an inkbird 308 temp controller to make my "fermentation chamber" for a brew I did yesterday. I have it set to 68. The problem I am having is it will cool down to 64 or so before climbing back up. Anyone have an idea which setting might better keep it from doing that?

thanks

Offline Stevie

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Re: inkbird 308 question
« Reply #1 on: June 18, 2017, 01:47:47 PM »
Where is your probe?

Offline zman51

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Re: inkbird 308 question
« Reply #2 on: June 18, 2017, 01:52:13 PM »
Up to now, it was suspended in air inside freezer. I been googling all morning and just put a jug of water in freezer and probe inside that. Not sure if that will help or not

Offline Stevie

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Re: inkbird 308 question
« Reply #3 on: June 18, 2017, 03:40:47 PM »
That will help. I like to attach the probe to the side of the fermenter with some foam and tape.

Offline zman51

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Re: inkbird 308 question
« Reply #4 on: June 18, 2017, 04:36:26 PM »
thanks. I was going to do that but now that carboy is in cooler, the carboy wasnt dry enough for tape to stick. Lesson, put tape on before putting it in cooler!

Offline zman51

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Re: inkbird 308 question
« Reply #5 on: June 18, 2017, 06:12:55 PM »
So I think the probe in water is helping some. Right now, I have it set to 68. I watched a whole cycle. The compressor kicks on at 69 and then kicks off at 68. But even at that it gets down to 66.4 before starting to climb again and this takes some time. It stayed at 66.4 for 30 minutes before starting to creep up. Is this in range or should it be able to dial in better than that?
Other thing I didnt think about is setting on freezer. It has 5 settings from coldest to warmest. It came factory set in middle. Would one way or other be better?

Offline Stevie

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Re: inkbird 308 question
« Reply #6 on: June 18, 2017, 07:02:41 PM »
Setting in the freezer won't make a difference.  The overshoot is just they way it is. The coils in the wall are crazy cold and will continue to cool the space. Probe on the fermenter will help.

My fermenters are in milk crates (don't steal) and I wedge the probe against the fermenter with some foam. In the past I used a nylon strap with an adjustable buckle to hold it in place.

I have silicon dehumidifiers along with computer fans in my freezer to keep air moving. This helps keep the moisture down. I unplug the fans about 30 minutes before opening he fermenter to let the air calm down. Letting the moisture go unchecked will create lots of mold.

Offline zman51

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Re: inkbird 308 question
« Reply #7 on: June 18, 2017, 07:56:05 PM »
Setting in the freezer won't make a difference.  The overshoot is just they way it is. The coils in the wall are crazy cold and will continue to cool the space. Probe on the fermenter will help.

My fermenters are in milk crates (don't steal) and I wedge the probe against the fermenter with some foam. In the past I used a nylon strap with an adjustable buckle to hold it in place.

I have silicon dehumidifiers along with computer fans in my freezer to keep air moving. This helps keep the moisture down. I unplug the fans about 30 minutes before opening he fermenter to let the air calm down. Letting the moisture go unchecked will create lots of mold.

thanks stevie

So if I am shooting for 68 and it varies from 69 down to 66 wont cause any issues?

Offline Stevie

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Re: inkbird 308 question
« Reply #8 on: June 18, 2017, 08:07:08 PM »
Not really if attached to the side of the fermenter. Once you do that, the temp will be within 67-69 for a 68° set point.

Offline zman51

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Re: inkbird 308 question
« Reply #9 on: June 18, 2017, 08:20:43 PM »
thank you

Offline narvin

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Re: inkbird 308 question
« Reply #10 on: June 18, 2017, 09:35:25 PM »
You don't want it to maintain a tight air temperature range because quick cycling is bad for the freezer, which is designed to operate for longer periods below freezing.  The jug of water is what I do if I have multiple kegs for conditioning or serving.  If you're fermenting, measure the beer temp directly by attaching it to the side like others have mentioned.  Air temperature is basically irrelevant, as it is not that conductive.
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Offline zman51

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Re: inkbird 308 question
« Reply #11 on: June 19, 2017, 01:06:06 PM »
thanks. I watched the cycle and once it stopped at 66.4 it took almost two hours to climb back to 69 so hopefully that is good for the compressor

Offline Hand of Dom

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Re: inkbird 308 question
« Reply #12 on: June 19, 2017, 02:48:17 PM »
I have my Inkbird set up for celcius, and have the min/max levels set to +/-1c of my target temp, and a cooling delay of 3 mins.  With an undercounter fridge stored indoors, it doesn't cycle on/off particularly frequently.  I tend to ferment between 18-22c, so it's generally around room temp anyway, and when I'm trying to cold crash, it's pretty much running constantly to get down to 4c before I package.
Dom

Currently drinking - Amarillo saison
Currently fermenting - Pale ale 1 - 2017

Offline Kochhandwerk

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Re: inkbird 308 question
« Reply #13 on: June 20, 2017, 04:07:37 PM »
I had a similar issue and went with the option of placing the probe inside a large water bottle next to the fermenter. I have also taped it to the side of the fermenter and covered it with some plastic for insulation.  Both options are better than nothing, but I a thermowell through the fermenter lid would be much, much more accurate and better on your freezer's compressor since it'd cycle less.

Offline Stevie

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Re: inkbird 308 question
« Reply #14 on: June 20, 2017, 04:40:08 PM »
Thermowells have major drawbacks when using "dumb" thermostats. By the time the probe hits the set point, the outside of the beer and the chamber are much colder. I get a much greater overshoot with my thermowell compared to the side of the fermenter. PID based thermostats are a different story.