frodus wrote:always overdesign That's my motto!
Here's my BAD (Big Ass Discharger)..... working on the gate driver and controll circuitry right now, but the mechanical side of it is done....
Designing for ~200A per module, and there's 6 of em..... still need to find some decent fans, these get hot! Each pair of modules protected with a contactor and fuse and each unit has it's own shunt. I know it's overkill, but we plan on testing some serious loads.
and BTW, thanks for the help John. We were considering load resistors too, but ended up going with driving them in their dissipative mode.
I am using the Sunon 120mm PSD1212PMBX fan. Actually I will be using 2 of the them. They are a 200CFM fan and are the most powerful 12v unit I have personally ever seen. I made a quick video here:
Keep in mind when I pull the camera away I believe that my phone had turned the microphone way down. They are amazing units!
Oh and they are also only 9.95! http://www.ebay.com/itm/Sunon-120mm-200CFM-12-Volt-DC-Fan-PSD1212PMBX-Powerful-/320752775803?pt=LH_DefaultDomain_0&hash=item4aae5af27b