According under load, funny smell

Okay, it is a electric product, so the usual plastic odor at the beginning is probably normal. But the volume of the fan made me (negative) surprise. Approximately five minutes after starting the test (12V car bulb, 55 W) boomed both fans going. Sound than would have been my microwave in operation! Exhaust air is cool, all right therefore, but still, that's better (stepless fan control, as in the PC).

But otherwise everything was great, voltage and current are kept correctly, parallel and series operation are implemented. Perhaps we should think about larger buttons of Manufacturers times, 0.1 V / 0.01 A are not really easy to meet :-)