I found the advert .
It was on Stakesy’s website, but perhaps not of european manufacture.
**LINK**
850W input but only 445W output. Some considerable difference, that! Only a little over 50%
Now, if the Warco motor is of similar ilk, I do wonder what the real truth is, regarding the power of the machine.
If the output is a real 900W (which I would expect of a Warco product) then the heat loss could be as much as 225W at only 80% efficiency. But note Dave’s comment about far east imports so could be worse – but hope it’s not.
If on the other hand… on the same efficiency as the example above, the real power could be 900*445/850 = 470W with a heat dissipation of 430W!. That would be some heat to dissipate to the motor casing and to the forced air cooling.
Those figures would/should not apply for a motor running at low power. But who knows!
Edited to add that those input/output figures might include some mechanical losses, I suppose, but doubt it.
Edited By not done it yet on 26/08/2019 18:51:47