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Home Brew Forums > Home Brewing Beer > DIY Projects > Still no STC-1000 fahrenheit model?
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Old 04-30-2014, 03:26 PM   #21
sdgenxr
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Originally Posted by raouliii View Post
The fundamental factor in relay contact rating is current, not power, so it doesn't really work that way.

Actually, that relay appears to be rated at 12A/125VAC. I do agree that maximum current capacity of the entire unit is dependent on all current carrying components. Relay, PCB traces and terminals. Exactly what is the limiting factor is hard to say. I have inspected a number of different versions of these units and found varying depth/robustness of the PCB traces. It is safe to say that the manufacturers current rating of the device should be used.

Most fractional horsepower refrigeration compressors don't draw 10amps and momentary startup current can usually be discounted if cool delay function is used. Higher capacity cooling components such as window a/c units must be analyzed individually. Heater wattage/current is a design value that must be considered closely. For a fermentation chamber, where slow heating and cooling is preferable, 50w per carboy is more than enough.

The real danger using one of these units comes when someone attempts to use them to directly power a boil element, which should NOT be attempted. A recent thread showed photos of the resulting carnage.

HF32F-G Datasheet
Agree completely and updated with new current rating specs provided. Thanks!
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Old 05-01-2014, 03:51 PM   #22
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I really do hope more ppl would give stc-1000+ a chance. In addition to being an stc-1000 that does have fahrenheit it adds more features that really adds both to usability as well as usage. And I think consesus among those who have tried it is that it is working very well.
I understand not everyone is able to upgrade themselves, but we're all partners in crime here. Maybe someone close to you does have the ability and could help out?
I would really like if homebrew clubs could offer this service.
I do think that if you would give stc-1000+ a try, you wouldn't regret it.
From reading the feature list it sounds like the STC-1000+ is fantastic (thank you for developing it!), and I lust to upgrade mine as I always do temperature ramps during fermentation. (I don't care about having to use celcius.) Unfortunately everything about the upgrade process flies so far above my head it might as well be in orbit.
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Old 05-01-2014, 04:15 PM   #23
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I ordered the regular STC-1000, it should arrive soon, and I will strongly consider doing the STC-1000+ upgrade.

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Old 05-01-2014, 04:19 PM   #24
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I ordered the regular STC-1000, it should arrive soon, and I will strongly consider doing the STC-1000+ upgrade.
Make sure you ordered the proper STC-1000 as I believe there are different versions that may or may not work with the upgraded firmware. Wish I remembered where in the that thread they talk about the different board versions, but it's in there someplace.
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Old 05-01-2014, 06:56 PM   #25
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I'm about an hour away from fermenting my first batch with my new Fahrenheit controller. I have been testing it for 2 days and so far so good. The only thing I notice is a 2 degree difference between the actual liquid temperature and what the reading is when I tape the probe to the outside of the fermented. Insulating it with bubble wrap and a towel doesn't seem to make a difference. I can live with two degrees.

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