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Old 06-01-2013, 10:03 AM   #1
Join Date: May 2012
Posts: 35
DC water pump install


I am installing a dc water pump for a water dispensing system in my 04 30q Hurricane. I am going to run a dedicated line to the dc fuse box ( I have an open slot ) the pump will work on a demand valve system. The specs say max amps 3.0. What size fuse should I use in the dc side of the fuse box? I am not sure because most of the fuses are 15 amps including the one on the dc pump for the potable water system.

Thanks for your help.

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Old 06-01-2013, 10:13 AM   #2
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I would use a 10 Amp fuse, use # 14 AWG wiring or better.

Siggy & Ursula.
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Old 06-01-2013, 03:27 PM   #3
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Thank you! Will do.
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Old 06-01-2013, 03:39 PM   #4
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The reason a 10 amp fuse would probably be appropriate is that a DC motor typically uses 3X it's run current to start it's rotation. Once it's running, it'll be drawing no more then 3 amp. That's assuming the supply voltage stays relatively constant and at the voltage rating of the motor.

However, not all motors are created equally so in the industry we say that the starting current can be 3X to 5X the run current. Which could make a 15 amp fuse necessary. Especially if you have chronic low battery voltage. You'll find that out if that 10 amp fuse blows more then once a year (which I doubt will happen).
'02 Winnebago Journey DL, DSDP, 36' of fun.

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Old 06-01-2013, 03:58 PM   #5
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Jim thanks for the explanation. That makes perfect sense.
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Old 06-01-2013, 07:39 PM   #6
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Does the pump have a fuse?

How long is the wire when installed?

12 volt systems require larger wires than normal depending on length and current, with low voltage the resistance of the wire makes a difference.

If pump has a 3 amp fuse then fuse can go at pump end, with " wire fuse " at main connection point.

Say you use 12 ga wire for minimum voltage drop, wire is rated for 20 amps, so you use 20 amp fuse in the fuse block.

This allows other things to be powered by same wire as well.

At the pump you use the fuse the pump is rated for, if pump is in hard to get to place then fuse wire with pump rated fuse.

Tony & Lori
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water, install

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