Same as Dave Morris. Run mine from cig' lighter socket for 6.5 years no problem!

BUT, I would advise an electronic flow controller (digital varistream) & 8mm hose instead of 6mm.
Using a varistream means the pump only cycles at the minimum speed required unlike a bypass system where the pump runs flat out regardless of flow setting!
varistream + 8mm hose pulls very little amps from the battery.
