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paulz
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# Posted: 28 Sep 2017 15:36
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I just replaced my 1 gpm 12v Flojet pump with a 2.9 Flojet (03526-14A) for a better shower. I have a pretty long wiring run, about 50ft. of 16 gauge wire, from my battery to the pump, including a switch and some connectors. The old pump worked just fine, even when battery power was low, but the new pump doesn't shut off. If I jumper a battery right at the pump it turns off fine, but it doesn't like the voltage drop through the wiring. Even with thicker wire and a shorter run I don't think it will turn off when battery power is low.
Has anyone attempted to adjust the pressure switch on one of these?
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razmichael
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# Posted: 28 Sep 2017 21:48
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You will definitely have an issue with voltage drop. The pump draw is 4.4 amps @10psi. 16g wire at 50 ft is almost 15% so 12v to 10.33v. VoltageDrop
Not sure adjusting the pressure switch would help. Can you move the pump closer and just use longer plumbing lines? Maybe heavier wires and/or multiple conductors (fuse appropriately for multiple conductors).
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paulz
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# Posted: 29 Sep 2017 10:46 - Edited by: paulz
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Thanks! Yes, I can easily move the pump from under the bathroom to the front of the cabin and eliminate most of the wire. Just pvc pipe, excellent idea! As an added bonus, I will no longer have to walk around to the back of the cabin to turn off the water when I leave.
And thanks again for the voltage calculator, that will be coming in handy.
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Just
Member
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# Posted: 29 Sep 2017 10:58
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there is a pressure agustment screw under the pressure switch cover on most pumps .
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paulz
Member
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# Posted: 4 Oct 2017 12:38
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Well moving my pump seemed like the answer..until I realized the switch is in the bathroom back by the pump, so wiring length wouldn't change much. So, I replaced the 16g wiring with 10g. Problem solved! Thanks again!
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razmichael
Member
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# Posted: 4 Oct 2017 13:19
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Too late but you could also have used a relay at the pump and 16g wire from the switch to the relay. I have three sinks with taps that include on/ off switches built in. They all connect to a relay that sits near the pump with heavy gauge wire (battery to relay to pump).
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paulz
Member
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# Posted: 5 Oct 2017 09:37
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Yep, that would have worked, thanks for the thought.
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razmichael
Member
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# Posted: 5 Oct 2017 20:09
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As a side note I use these very low draw relays also for 3-way lights for the lofts. Switches downstairs and upstairs. This avoids any issues with voltage drop due to the long runs needed for 3 way switches. Also use them along with a couple of motion sensor connected lights (that actually have internal relays) so a light switch can override the motion sensor and turn the light on “manuallyâ€. Bit complicated logic for the wiring but works great.
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