OK, I know Peltiers have been touched on many a time, but I need personal assistance anyway. I tried reading first and I just couldn't sort out an answer.
I am building a cooler for a 12 gallon aquarium. The peltier will attach directly to the glass and have a heatsink and fan on the other side. The unit I am planning to use runs 80w at 12v. I am looking to cool this water no more than 15(F) degrees below ambient. In fact, it will most likely need to set only about 5 degrees below ambient.
I have 2 power supplies available, one is a standard wall pack that runs at 3A, or 36w. I would prefer to use this one and use a potentiometer to reign in the peltier, IF the unit will be capable of cooling the water as described while running at basically half it's full power.
If this will not be powerful enough, I also have a desktop PC power supply that can run up to 12A, or 144w. This would allow me to run at full power but would add more noise than I like.
In both cases, I want to be able to control the voltage or amperage on the peltier, turning it up a day at a time until I get the temperature down low enough, but I can't afford to overshoot it by too much or I freeze out the livestock. I had planned to use one of the setups described above and start with the potentiometer at full resistance, gradually increasing power to the peltier daily over a period of a few weeks as necessary.
So question 1 (if anyone knows) is whether or not I could use the 2A source and expect a usable result.
Question 2 is the same as the first using the PC power supply.
And question 3 is, assuming I could use one of these 2 setups, is there a potentiometer that can handle 80w? Or am I coming at this all wrong by using a potentiometer?
Thanks in advance.
I am building a cooler for a 12 gallon aquarium. The peltier will attach directly to the glass and have a heatsink and fan on the other side. The unit I am planning to use runs 80w at 12v. I am looking to cool this water no more than 15(F) degrees below ambient. In fact, it will most likely need to set only about 5 degrees below ambient.
I have 2 power supplies available, one is a standard wall pack that runs at 3A, or 36w. I would prefer to use this one and use a potentiometer to reign in the peltier, IF the unit will be capable of cooling the water as described while running at basically half it's full power.
If this will not be powerful enough, I also have a desktop PC power supply that can run up to 12A, or 144w. This would allow me to run at full power but would add more noise than I like.
In both cases, I want to be able to control the voltage or amperage on the peltier, turning it up a day at a time until I get the temperature down low enough, but I can't afford to overshoot it by too much or I freeze out the livestock. I had planned to use one of the setups described above and start with the potentiometer at full resistance, gradually increasing power to the peltier daily over a period of a few weeks as necessary.
So question 1 (if anyone knows) is whether or not I could use the 2A source and expect a usable result.
Question 2 is the same as the first using the PC power supply.
And question 3 is, assuming I could use one of these 2 setups, is there a potentiometer that can handle 80w? Or am I coming at this all wrong by using a potentiometer?
Thanks in advance.