On 30/04/2019 14:22, Tim Lamb wrote:
I suppose we need to consider pump motor efficiency.
The worst small DC motor I have ever tested was around 50%.

Spend a little and you are up in the 75%+

If you get a quite big one , run it on a higher voltage and gear it down
it is even better.


--
€œIt is hard to imagine a more stupid decision or more dangerous way of
making decisions than by putting those decisions in the hands of people
who pay no price for being wrong.€�

Thomas Sowell