Quiescent current of 12v brushless water pump
The pump itself requires nothing when it is not running. The brushless controller may well draw significant current. There is not a &quot;normal&quot; or &quot;typical&quot; value here, it's whatever the designer chose. For example they may have saved a few pennies by using a regulator that draws 5 or 10mA with no load, which may seem perfectly reasonable if battery power is not being considered. 10mA at 12V for a month is equivalent to 5W for more than 17 hours.
Easiest thing is to measure it. But if it draws too much you can likely simply cut power to it when it is not being used, with a relay or a MOSFET.