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Ok, last batch of this year, IPA Double, 1070 OG, 46L (12 Gal): lots of CO2 to collect! I ended up using two Cornys as storage (and I think I'll add a third), sanitized and filled with water to keep the O2 out. I haven't had time to build a controller, but this batch produces CO2 at such a...

mmm, yesterday I was so excited to test it that I actually didn't think about the possibility of a rocket taking off in the basement and coming at me, or a bomb exploding near me...I think eyes or ears protections wouldn't be enough to avoid injury. I think I will deflate it this evening while...

Ok, after reading your posts I decided to go down to 5 bars (72 psi) ;)! I manually turned the compressor on and off to fill the Cornelius (wearing eyes and ears protections), so no risk of accidental explosions (but the risk of "intentional" explosions remains :oops:). The Cornelius has...

I think an ESP32 will suffice, plus a dallas 18b20 chip and a relay board. You'll have to design the connections, buy the connectors, and solder everything to make it work (and it always takes a bit of troubleshooting). At this point you will enter a programming nightmare of trial and error...

OK, I don't usually make beers this alcoholic... The thing I didn't expect was that, with this initial gravity pushing the fermentation very quickly, I could fill the cornelius with CO2 in half a day! No control unit would be needed, but this is a special case. Avoiding the control unit has...

I'm testing it in a real environment. Purged Keg and bag with CO2 belonging from a 23l (6 gal) IPA (OG 1055). Now I'm trying to store CO2 from a 41l (10 gal) double IPA (OG 1070). I'm turning it On and Off cause I'm still missing a control unit but I'm working on an ESP32 simple board that...

Ok, I've got little updates for you. Mainly I upgraded to alu bags and eva barrier tubings. I started working on aluminum bags to test if they are adequate, as for now they don't convince me because the plastic layer is very thin, so I fear that it will break over time if inflated/deflated...

I'm ready to start experimenting... after all, I still haven't told you about my kegerator powered by an ice cream maker engine plus a couple of liters of propylene glycol from my e-cigarette. Managed with a wifi controller (not exactly...it's an esp-now connection). Maybe with another ice...

It's pretty clear to me after rereading whole thread that the project could fail for more than one reason. And I have to thank you all (no sarcasm) for that. First of all for the O2 speech.... I would like to do some empirical, but "controlled" tests, such as trying to carbonate half a batch...

it doesn't seem difficult to produce a control system... The values that the ESP32 reads are significantly different....

Before posting on this forum I had actually asked NASA if they were interested in my CO2 recovery system. They appeared very enthusiastic about my discovery and immediately dedicated 4 engineers to investigate further.

Please Lizard explain why... the only drawback I imagine if moisture goes into the storage keg... is the possibility to encourage bacterial/yeast growth... Tx, Ale p.s.: what about replacing bag with this one?

this is what I was thinking to try before getting stuck with the O2 problem above.... A potentiometer who can detect bag height and activate/de-activate compressor. I was quite ready to start experimenting with some simple esp-32 code... but I got stuck with the O2 and bag question... damn!

Bassman2003: this is a bit of a difficult question for me! I think what drives me is the passion for DIY, which I inherited from my father. And perhaps even earlier by my grandfather, who made his own wine (all year round), cultivating the vines; he also raised hens, rabbits, chinchillas, for...

No I think I won't, even if I have a big linguistic limitation and therefore posting costs me a bit: I have to get a mental image of what I want to say in English, then I have to try to write it and finally (if I'm not particularly pissed off and so I don't care) I want to feed it to google...

Bassman2003: please forget what I've said before, because I've had new inputs so I'll have to revise my project.... Before making a prediction on how many liters I'll need or on the purpose (carbonation or transfer?), I need to better understand the risk of diffusion of O2 in the system. This...

these are the bags my shop utilizes now.

I've done some research here and there, mostly on some manufacturer's homepage. It's very difficult to have a technical datasheet for a single product... so It could be quite difficult to know diffusion/resistance data of the bag you're choosing, at O2. What I have learned is that an aluminum...

Ok, you both convinced me to further investigate on O2 permeability, before going on. Thanks, Ale

i you want to study oxidation in the bag you'll need a "blind" comparison :p. (EDIT: mmm, no, it's not "blind" it's only a comparison, sorry) For example a glass jar in the same conditions of temperature and light exposition. For now it is not my priority but you have given me food for thought...