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Old 01-14-2013, 07:50 AM   #11
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Nice work!

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Old 01-14-2013, 01:55 PM   #12
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Quote:
Why a quarter?
http://en.wikipedia.org/wiki/Ohm%27s_law

Quote:
And do you risk damaging anything by running it at a lower voltage?
No
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Old 01-14-2013, 04:15 PM   #13
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Originally Posted by Clearcut23 View Post
Awesome! I already have an inline filter I've been using to filter my beer. Also I never thought of using food grade RV water lines. I was going to solder and hang copper pipes all the way across my garage. Now I may just use the RV water lines to get across the room then 90 it down with a copper pipe and water shut off
PEX is the way to go for plumbing. RV tubing would be more appropriate for a hose.
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Old 01-14-2013, 04:54 PM   #14
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Originally Posted by BetterSense View Post
I was going to be silly and say "physics". These heating elements are just a big resistor that is fixed. The currently flow is proportional to the voltage applied. If you halve the voltage, you halve the current. Since power is voltage x current, you've halved the voltage, halved the current and therefore have to divide power by 4.

In numbers it goes like this:
4500w / 240 (rated voltage) = 18.75 Amps (current at rated voltage)
240v / 18.75a = 12.8 ohms (this means the element is 12.8 ohms fixed so all other voltages applied can be figured out around this.

120v / 12.8 = 9.375 a given the new voltage.
120v x 9.375a = 1125 watts.

Let's say your grid is actually running 111v:

111v / 12.8 ohms = 8.67a
111v x 8.67a = 962 watts actual
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Old 01-14-2013, 07:00 PM   #15
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Quote:
Originally Posted by Bobby_M View Post
I was going to be silly and say "physics". These heating elements are just a big resistor that is fixed. The currently flow is proportional to the voltage applied. If you halve the voltage, you halve the current. Since power is voltage x current, you've halved the voltage, halved the current and therefore have to divide power by 4.

In numbers it goes like this:
4500w / 240 (rated voltage) = 18.75 Amps (current at rated voltage)
240v / 18.75a = 12.8 ohms (this means the element is 12.8 ohms fixed so all other voltages applied can be figured out around this.

120v / 12.8 = 9.375 a given the new voltage.
120v x 9.375a = 1125 watts.

Let's say your grid is actually running 111v:

111v / 12.8 ohms = 8.67a
111v x 8.67a = 962 watts actual
Thanks so much for the explanation.
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Old 01-15-2013, 02:02 AM   #16
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Did the first dry (wet) run tonight. Things went pretty well. Using my Thermapen I had to adjust the controller by about 1.5 degrees. I've attached a quick video. I still need to mess around with the controller a bit I think. Brew day is going to rock this weekend!

http://youtu.be/fsATBVvf8PY
-Jason

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Old 01-15-2013, 02:43 AM   #17
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That is awesome! I sent you a PM to see if you have more detailed pics of the inside to assist me with my build

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Old 01-15-2013, 11:43 PM   #18
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I also would be interested in detailed pics of the inside, or even your wiring diagram. Thanks

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Old 01-16-2013, 03:21 AM   #19
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Hey guys, I'll try to get something put together tomorrow. I was planning on doing it today but was way too busy

1 thing I have found so far is that I think I'll need a heatsink on the SSR, it did get a bit warm. I'll be getting this done before my weekend brew.

-Jason

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Old 01-17-2013, 02:17 AM   #20
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I tried to draw something up, think I got it right. Hope this helps.




Also tonight I installed a heatsink on the SSR I was able to keep everything inside still. I'll have to monitor it this weekend to see if I'll need a fan.

-Jason

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