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Old 09-17-2016, 11:08 AM   #1
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Water pump electric draw when not pumping

Was reading RV for Dummies and in the section discussing boondocking, it was suggested the water pump be turned off when not in use. I also found another source with this same suggestion:

"Speaking of power, the water pump draws its power from the batteries. If you do not have electrical hookups, you will also need to conserve battery power. Turn off the water pump and anything else that will draw power from the batteries when they are not needed."

So do water pumps draw electricity even though not "on?" And is there a different power draw on older pumps versus newer ones?

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Old 09-17-2016, 11:13 AM   #2
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I'd be interested to find out too; because the pressure switch on the pump should be a complete power off switch and I don't know how that would draw power without the pump running.

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Old 09-17-2016, 11:16 AM   #3
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Maybe just a very slight amount of draw if you have the little indicator light on your switches ..........other that that........no power draw till the motor runs, I would think........
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Old 09-17-2016, 11:43 AM   #4
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Just a guess here but I think the reason for that statement may be is if there were a pressure drop for any reason, the pump would come on and draw on the batteries when you are not using water. Hope that makes sense.
I cannot see how the pump could draw current when it's off.
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Old 09-17-2016, 11:56 AM   #5
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I understand that some water pumps have relays to control them.

There would be some slight draw from that, along with the tiny indicator.
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Old 09-17-2016, 11:58 AM   #6
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Pump coming on when 'no demand' is a great tool........lets you know you have a leak somewhere. So find it and fix it.

As to battery drain with pump off...........
Indicator light on panel and if you have a multi-switch set up using a 'controller' it will also have a parasitic drain
Just like radio, LP Detector or other components that need battery voltage for memory and/or display

When boondocking 'parasitic draws might be an issue but one should have 'recharge' capabilities regardless...........solar, generator etc.
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Old 09-17-2016, 09:55 PM   #7
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"Pump coming on when 'no demand' is a great tool........lets you know you have a leak somewhere. So find it and fix it."

The pump doing a couple of "burps" when there is no real demand such as an open faucet could mean that there is some little piece of dirt stuck in the rubber diaphragms in the pump causing water pressure to be released. By running some water for a period of time usually clears this up by moving the obstacle out of the system.

"As to battery drain with pump off...........
Indicator light on panel and if you have a multi-switch set up using a 'controller' it will also have a parasitic drain "

The momentary switch on, momentary switch off is activating a latching relay. When you hit the switch once, it either turns on power or power off to the pump. It only draws power while the switch is being pushed.

The only real power draw is the little light in the switch which I seriously you can measure the actual current draw of.

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