Its an interesting problem, I'm about to order the F150 unitank, the heating is sorted and I need to get the G20 to connect to the Brewtools heating element.
At this point I am hoping to use the G20's bypass circuit which is suppose to be for this purpose. A good bloke at Kegland pointed me to the instructions.
Getting the telemetry to the Rapt Cloud interface would be nice, or even better having the Rapt controller connecting/managing the heating and cooling options for the fermenter would be great.
Down the track I will probably add a thermowell into the unitank and use the Rapt controller temp probe as pure telemetry.
For now though I'm happy for them to continue work on the Rapt interface.
In the future I think the best way to do this is to leave the G20 as a relatively "dumb" device but use additional temp controllers that control a valve to allow the glycol to flow to the tank and then use the AC heating outlet to control heating to the tank.
So in other works each time you add on another fermenter you add on another temp controller box kit with valve.
We have been working on some new glycol control valves that will take a PWM signal so what we will probably do is sell it as a kit so the RAPT temp controller box has not cooling output but just has a cord where the blue cooling socket is normally located and this cord plugs into the PWM controlled valve. What do you guys think of this option?
Having a PID cooling function is also probably a good idea so the PWM controlled valve can move from 0-100% open based on the PID settings and temperature etc.
In some home brew applications PID is a bit of a waste of time but with glycol cooling it's often the case that you overshoot the mark so I think PID in this type of application is not a bad idea.
Keen to get your thoughts on this guys.