Quote:
Originally Posted by oil pan 4
My amp meter says the pump draws a little under 2 amps at 11 volts (the jump pack is getting low on power).
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Get a brushless mag-drive pump. You don't have to worry about brushes wearing out, you can PWM control it to vary the speed, there are no pump seals to wear out or leak, and the pump takes a lot less juice because there's no seal friction to overcome.
The coolant pumps I'll be using on my bike (US Solar Pumps, model TL-C11H) pump 10 lpm with a head of 0.75 meters, they each take ~6 watts.
In a recirculating system with all the air out of it, the only head is the flow resistance of the system, so the pump's not working very hard to lift the water, since the weight of the water balances going up and coming down whatever height you're pumping it to.