Adding heat to a deep freeze fermenter.

[RPh_Guy]

I did not see it overshoot on inkbird, and that is the problem.

Ambient temp doesn't matter as long as the beer fermentation temperature is at target. I don't see how it could get any more accurate than a thermowell.


You'd see the same ambient fluctuations when cooling. When the compressor is running, ambient temperature is very cold and fluctuates wildly when cycling on/off.
Air has much lower heat capacity than water (beer), so the air temp fluctuation is a non-issue whether heating or cooling.

 

[Shady]

I use a reptile bulb for heating. I wrote my own controller using a raspberry Pi and 3 DS18B20 temperature sensors. I have one in the thermowell, one in the freezer and one in the room. It works very well. Whenever the freezer or heater are activated, I disable the other for 2 hours. This stops it bouncing between the two.

 

[Stand]

I have the same freezer and looking to add gas just like you did. Curious how you routed (where drilled) the supply line to your manifold to come out of the hump like that. Looks like a good way to go!

The hump is only sheet-metal, so if you take out the screws (9 I think?) it will come right off. Behind it on the right hand side there is a large rectangular cut-out in and exposed foam. I just pushed a screwdriver through to make sure I wasn't hitting anything (there's nothing there), and then drilled a hole to bring in power for a PC fan, heat mat cord, temperature probes, and the CO2 line. I sealed everything with Silicone and drilled holes in the sheet-metal hump. Love those Aviation connectors.

It was super easy.

 

[Aristoi]

@Stand thanks for the info, I did not realized that cover came off so easy. I am going to give it a try