Pro/Forums - View Single Post

Butcher · 03-18-2004, 05:36 PM

In parallel everything has the same voltage. So for speccing you add the currents. Series is more complicated as everything has the same current, but the voltages are split. For ohmic devices the split follows the law of potential dividers. Unfortunately, TECs aren't ohmic - they're semiconductors. I wouldn't reccomend running them in series.
If you want to run both off a single supply you need a unit rated for 33A continuous (nb: make sure the rating on a supply you buy is continuous, not peak).

Also be warned, if you put a load of 100W on a 12V, 25A TEC you'll need to sink 400W off the back - 300W from the TEC and 100W from the load.

03-18-2004, 05:36 PM	#4
Butcher Thermophile Join Date: May 2001 Location: UK Posts: 1,064	In parallel everything has the same voltage. So for speccing you add the currents. Series is more complicated as everything has the same current, but the voltages are split. For ohmic devices the split follows the law of potential dividers. Unfortunately, TECs aren't ohmic - they're semiconductors. I wouldn't reccomend running them in series. If you want to run both off a single supply you need a unit rated for 33A continuous (nb: make sure the rating on a supply you buy is continuous, not peak). Also be warned, if you put a load of 100W on a 12V, 25A TEC you'll need to sink 400W off the back - 300W from the TEC and 100W from the load. __________________ Once upon a time, in a land far far away...