The thing I don't really understand is you mention you have another hobby that requires much of your extra time and money yet you consider paying hundreds more for a control panel kit you still have to assemble vs just buying the listed components from the links Kal provided or doing some shopping around . . .
I appreciate your input, and, hopefully, the OP and others can benefit from the discussion. Even though it's an awful lot of words, please go back and read thru my 1st response to the OP, then my 2nd response will make more sense.
JOHNNYROTTEN's original question had to do with brewing
large extract batches - 15 gallons (probably 3 5-gal brews together). He wants to do this with electricity instead of propane. He only needs 1 kettle/keggle. He won't be mashing - except for steeping some specialty grains, so he doesn't need automatic temperature control and all the apparatus that that requires. As passedpawn and KPSquared suggested, he only needs to mount an element into a kettle or keg and build/purchase a very simple electric control.
A few statements to clarify why I made my suggestions and why I posted the specific items that I may purchase - and that the OP can take into consideration in building his own simple system:
1. The controller I mentioned from High Gravity is not a kit; they sell several different fully assembled controllers. I've done a few BIAB batches using propane and have considered purchasing their BIAB kit that includes everything (a little >$1000). I've since considered scaling back - and this thread is convincing me - and doing extract-only, since many very fine beers are brewed this way. That's why I may purchase their $249 EKC (not a kit) to simply substitute electricity for propane. If I find myself brewing more and drinking more, then I will improve my equipment - perhaps purchase their ready-made EBC-SV with temp control designed for BIAB or building my own as you suggest (and as I've already planned).
2. The other hobby is an old pipe organ that I got from the estate of an organist who removed it from a church. It has about 800 pipes and was set up and partially playing in my previous basement. I'm a physician and amateur organist having played the organ for church for 15 years, and I would like to be able to practice the organ at home. I've already thrown $18,000 at this project, and I don't want to trash it. There's a coolness factor to this - much like brewing your own beer. My current basement is not as deep as the one in my previous house, so I will have to re-engineer some components of my organ to fit the new space. While homebrewing is very interesting, I've had a dream of having a home pipe organ ever since I was in college, so the organ will have to take priority.
3. I'm pretty handy with my hands, so I'm OK with DIY projects. I'm just having to balance my time, money, and other priorities. I have already made a keggle (
https://www.homebrewtalk.com/f51/keiths-cut-keggle-353760/), but my son has appropriated it for himself and moved away. Believe me, I have read Kal's entire online book several times. I have even planned out - in conceptual form - my own control panel using principles in Kal's design, electrical advice from PJ, as well as ideas borrowed from other HBTers/BIABers. The process of selling a house, renting x 3 years, then purchasing a house has given me the opportunity to research my options - and change my mind a few times.
4. I'm not interested in 3-Vessel brewing. I became interested in BIAB 2 years ago, so that's the route I plan to take when performing all-grain brewing. Kal's control panel is probably the best out there for 3-vessel electric brewing. Some folks have adapted his design to control propane burners instead of heating elements. If I were committed to 3V brewing, I probably would purchase his control panel kit for $1420. If I were in a hurry, I'd purchase the panel already built and tested for $2154. OTOH, the High Gravity pre-built EBC-SV control panel for single-vessel BIAB is $495. So, depending upon where I want to spend my DIY time/energy, I may still purchase a control panel when I want more features and more precise temp control - or I may build one; I have my idea on paper on my computer. Most of what I need to do to the organ will take mostly time and utilize tools I already have. If I have a little more money lying around than I have time, then I don't mind purchasing some brewing stuff already built. Anyway, I think I've explained that well enough.
As you suggested, I'm getting ready to punch holes and electrify my current kettle and, as I explained above, am considering purchasing a 15 gal kettle to electrify myself. So, it's a plan of (1) DIY in areas where I can do my best and (2) purchasing some components pre-built.
I would recommen watching some you tube videos of control panels and brew system and maybe utilizing 15 gallon stainless kegs that can be purchased from beer distributors for $30 deposit.... <snip>.
I've already done all that. I've been studying this forum, the Morebeer forum, and the BIABrewer forum for 3 years. As I said, I've already made
and polished a keggle. My response was specifically geared towards the OP's desire to expand his
extract brewing. Since I'm also interested in scaling back to extract brewing, I researched some components and posted them for his consideration.
I spent about $800 for the whole setup including a cereal killer grain mill and a 20 plate b23 series plate chiller...
I spent a few hundred $$ on a beginner's brewing kit, a 7.5 gal SS kettle, immersion chiller, propane burner, other equipment. Later, a 7 cu ft freezer and a Ranco controller to have control over fermentation temps. My son got the keg for free, and I cut it, polished it, punched it, drilled it, and installed dip tube, ball valve, and sight glass from
www.brewhardware.com while the organ was in storage and we were renting.
Anyway, I appreciate your suggestions to me. If you re-read my postings, I think you will see that I'm already following your suggestions - insofar as they apply to extract brewing. I'm not exactly certain how far I will go in brewing, since I've never been much of a beer drinker. My wife prefers wine, so I may end up switching from beer to wine. This is another reason why I'm taking the "start low and go slow" approach.
Respectfully,
Keith