Hey Todd, I am very much interested in building an electric controller much like yours, but without the use of a pump. IYO, would this be fesable? Would do the "Bobbrews method" mentioned in post #53.
I found a P-J schematic that closely matches what I think is basic for me.
This first drawing here;
Single Element BIAB 30A PIDhttp://www.homebrewtalk.com/f170/list-p ... ms-382286/
Can you share your schematic or drawing?
Hey MS! Glad to see some of the old timers are still around.
I used the "30A 5500 Single Element PID" diagram in that thread and tweaked it a bit to give me a manual controller for my pump. PJ helped me when I had questions, not sure if he is still around there anymore. I never created a schematic, just designed it "on the fly". I'd be happy to answer any questions that I can. I like it becuase I can set the temp I want for strike, turn on the circulating pump, and go measure/grind grain, etc. When I come back to the kettle the water is waiting at the proper temp.
As to feasability, the only thing you need to take into consideration is stratification of temps in the kettle: the temp probe provides feedback in a closed loop to the PID which cycles the element, without constant stirring or circulation it won't heat evenly. Make sense?