Thread: will this work? thermoelectric phone charger
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j.s is offline j.s
2010-09-08 , 05:02
Posts: 486 | Thanked: 251 times | Joined on Oct 2009
#11
Originally Posted by deegore View Post
I'm getting 1.3 amps at 1.5 volts with 300 degrees. According to the lvboost.pdf that should put out 300 ma at 5 volts. I hope to get it put together later this week.
That's about 2 watts out of the peltier device, which seems reasonable, and 77% efficiency for the lvboost, which is also reasonable.

Are you measuring voltage and current at the same time?

What are you using as an electrical load on the device while you are measuring the voltage and current? Do you know what its resistance is?

When you measured 1.7 volts with your multimeter, it sounds like that was the open circuit voltage. (Voltmeters have very high resistance.)

If you measured current the same way, meter directly connected to power source with nothing else in the circuit, that is the short circuit current. (Ammeters have very low resistance.)

No device can supply full short circuit current while maintaining open circuit voltage.
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Last edited by j.s; 2010-09-13 at 00:05. Reason: Fixed bad typo in last sentence