Quick question on a DIY thermostat controller for PELTIER WATER CHILLER

Airwalker16

Airwalker16

Well-Known Member
431DB7EB-82C1-46DD-9D64-16F922EAEBE0.jpeg E1B7136C-A5E8-4978-9F53-15B0E9863E8E.jpeg BDE0EFB7-B492-40E4-BD6B-AF5465B37600.jpeg 34C49959-27E2-482E-B727-4FEF3A020207.jpeg question for mainly @dstroy but anyone who can help I’d appreciate an answer.
If I were to buy a peltier water chiller and want to run it to a thermostat controller with a thermistor probe, would I just simply run the power supply to the 12v inlet, and then run the actual red and black wires(including the fan wires) to the 20a max relay output side? Also, has anyone had any experience with peltier coolers for chilling something small like I need? Which is around 5-7Gallons?

I’d wire it all into a small project box so it’s nice and tidy.
 
dstroy

dstroy

Well-Known Member
Airwalker16 said:
View attachment 4096488 View attachment 4096490 View attachment 4096491 View attachment 4096492 question for mainly @dstroy but anyone who can help I’d appreciate an answer.
If I were to buy a peltier water chiller and want to run it to a thermostat controller with a thermistor probe, would I just simply run the power supply to the 12v inlet, and then run the actual red and black wires(including the fan wires) to the 20a max relay output side? Also, has anyone had any experience with peltier coolers for chilling something small like I need? Which is around 5-7Gallons?

I’d wire it all into a small project box so it’s nice and tidy.
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Yeah man, the load (cooler and fan) should get connected to the relay out.

The power goes to the “dc 12v power interface” like you said.

No practical experience with peltier coolers, just played around with them for fun so no clue how much water you can chill with it.
 
Airwalker16

Airwalker16

Well-Known Member
So the fans on these coolers I assume are probably rated for a quarter of an amp, maybe half or full, but those just get connected too? And pulls only what they need from the total of 6 amps?
 
Airwalker16

Airwalker16

Well-Known Member
dstroy said:
Most computer size fans like that only use about 5-15w. There’s a sticker on the fan motor that says what it needs.
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Yeah I know that. Also they usually say 0.25-1amp as well. So my question is do I just connect it all the same to the 6amp driver(20amp outlet relay on thermostat) and it will only pull what it Needs?
 
dstroy

dstroy

Well-Known Member
Airwalker16 said:
Yeah I know that. Also they usually say 0.25-1amp as well. So my question is do I just connect it all the same to the 6amp driver and it will only pull what it Needs?
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Since you know the wattage and voltage you can calculate amperage easily.

Yes, connect it all to the same output. You do not want that peltier chip to turn on and not have a fan running, it won't work or will break.
 
Airwalker16

Airwalker16

Well-Known Member
and I’m afraid I’m going to overload my 20a breaker with the addition of the chiller. Does it just need 6amps to get started or is that a constant draw of Power? Am I gonna need to add another 20a breaker to my box and add 3-4 more outlets? I’m already running quite a bit on this first one. 1100w of LEDs, 4 small air pumps and one large commercial one, multiple fans (1-6”/2-4”/2-oscillating), 1/10hp water chiller, 2 larger water pumps and one small one, and a few do dads here and there.

I’ve never Tripped it before.
 
Airwalker16

Airwalker16

Well-Known Member
So do these chips use a ton of electricity? I'm really not the best with how it all works and I'm confused. A lot of these that are 50 + Watts say they need 6 amps but it's usually a very low voltage like five to 12 volts. So they don't use a ton of Watts but my question is if you had say a basic 15 amp breaker for the room you were using and you already had lights fans and a few other things running, using say 11 amps worth of electricity. When using this is it going to pull 6 amps and trip the circuit breaker? I don't understand how it works.
 
Airwalker16

Airwalker16

Well-Known Member
and I’m afraid I’m going to overload my 20a breaker with the addition of the chiller. Does it just need 6amps to get started or is that a constant draw of Power? Am I gonna need to add another 20a breaker to my box and add 3-4 more outlets? I’m already running quite a bit on this first one. 1100w of LEDs, 4 small air pumps and one large commercial one, multiple fans (1-6”/2-4”/2-oscillating), 1/10hp water chiller, 2 larger water pumps and one small one, and a few do dads here and there.

I’ve never Tripped it before.


Reposted
 
dagweed

dagweed

Member
yes the peltier will need a constant 6a supply but that will only put about another .6 (6/10ths) amp load on your circuit breaker because the peltier is rated at 12v and your house circuit is 120v

just use ohms law and remember that watts is real power
volts X amps = watts
12v X 6a = 72w

72w of real power needed for the peltier so solving in reverse your house circuit needs .6A of 120v current to produce 72w
 
dagweed

dagweed

Member
ugh well i should mention that your AC adapter power supply is probably very inefficient and will be using some extra juice there wasted as heat
 
Airwalker16

Airwalker16

Well-Known Member
dagweed said:
ugh well i should mention that your AC adapter power supply is probably very inefficient and will be using some extra juice there wasted as heat
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OK. But it's not the super power sucking device I've made it out to be then? I've got 10gallons I want to chill and I've thought of using a peltier chiller to do it.
I'm just not sure what amount of power would be needed to do this.
 
dagweed

dagweed

Member
yeah even if the power supply is only 50% efficient it's still only another amp or two on your circuit breaker for everything
 
Airwalker16

Airwalker16

Well-Known Member
Question.

On a 20amp breaker for a NA110v circuit, if I used a unit with 4-12v chips that used7.5amps each needing a 30amp 12v power supply, with a good 1,000w already plugged into the outlets on that circuit, will this trip the breaker?

That circuit has 2,200watts of power total, but safely a usable 1,650watts of power right?
 
dagweed

dagweed

Member
no it wont trip the breaker. some 20A circuit breakers are rated for a continuous, non-stop load of 100% and some at 80% (a cheaper design meant to handle 20a surges but not constant loads)....they both trip at 20a though. i'm seeing your loads around that 80% level and not a problem. you may want to investigate your breakers make/model rating and replace it if its not 100%....most breaker designs are pretty cheap and easy to swap out.
 
Airwalker16

Airwalker16

Well-Known Member
dagweed said:
no it wont trip the breaker. some 20A circuit breakers are rated for a continuous, non-stop load of 100% and some at 80% (a cheaper design meant to handle 20a surges but not constant loads)....they both trip at 20a though. i'm seeing your loads around that 80% level and not a problem. you may want to investigate your breakers make/model rating and replace it if its not 100%....most breaker designs are pretty cheap and easy to swap out.
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It's a GE
 
Airwalker16

Airwalker16

Well-Known Member
@dstroy I know before you told me I'd just plug the power inputs pos and neg in to the terminals on the pod and beg of the thermostat, and then the fans,and prettier chips into s1 & s2(20a output relay on the other pic), but what is this diagram on the items site mean?s-l400.jpg
s-l400 (1).jpg

I'd like to use this one because it can be switched to Farenheit rather than Celsius.

I'll probably just end up buying a used 1/15,1/13 or 1/10 HP chiller off eBay instead of this though, but I still want to understand itm
 
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