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Old 01-10-2012, 12:49 AM   #1
dmbRedGetta
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Default I need an electrician's help

So I'm following the ebay aquarium temp controller build and I ran into a problem.

The controller is rated for 10 amps, but my freezer says it pulls a max of 12 amps. Is there any way to make this temp controller work with my freezer?

I just got the controller in today; it's the one mentioned in the original thread -- the STC 1000 found on ebay.

Thanks!


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Old 01-10-2012, 01:37 AM   #2
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I highly doubt that freezer is going to pull 12a continuous. It's likely the peak draw upon startup so you should be fine.


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Old 01-10-2012, 01:47 AM   #3
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If you want to be on the safe side you can buy a relay thats rated for 15 amps, or if its cheaper return it and get a contoller rated for 15amps. With electricty you want to oversize.
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Old 01-10-2012, 03:18 AM   #4
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The max amps will only be pulled for a second while the compressor starts. The continuous draw will be under 2 amps.
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Old 01-10-2012, 03:31 AM   #5
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If the compressor pulls 12 amps at startup wouldn't that fry the controller?
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Old 01-10-2012, 04:06 AM   #6
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That controller should be more than fine, it's rated 10A at 250V. And as mentioned, that max draw would only be momentary anyway.

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Old 01-10-2012, 04:22 AM   #7
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I repaired industrial controls for quite a few years. The peak current draw is going to be for a few milliseconds and then drop off. In addition there is typically a safety factor in component ratings (padding if you will). That said, you technically should be using a 15 amp controller but I honestly believe that this one will handle it for just fine.
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Old 01-10-2012, 01:57 PM   #8
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Thanks for the help, everybody!
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Old 01-13-2012, 01:52 AM   #9
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Another question -- would a 16 gauge wire work or should I go buy the 14 gauge? Thanks!
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Old 01-13-2012, 01:55 AM   #10
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Go with 14 or 12.


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