water pump circuit breaker pops

GTS340 · 11-01-2021, 02:26 PM

I use a Moroso switch panel that has snap action model MB1 20 amp breakers. After switching to a 16 volt battery. If I'm charging the battery and running the water pump at the same time it pops the circuit breaker for the pump. After they pop a couple times they're toast.. Any suggestions on a good fix for this.

present breaker

https://www.radwell.com/en-US/Buy/SN...xoCnHkQAvD_BwE

I did find this 50 amp breaker that might fit the hole okay.

https://www.monsterscooterparts.com/...BoCD3EQAvD_BwE

Thanks
Paul Haszlauer

Jeff Niceswanger · 11-01-2021, 02:47 PM

You probably already know this...But a much better fix is to use the switch panel to activate a 30 or 40 amp relay. That way your using minimal voltage to pull the relay in. Run at least 12 gauge wire from your battery to the relays input wire (You don't have to but I would install a 30 amp breaker or fuse), then another wire from the relays output wire down to the Water Pump itself. You can just use little 16 gauge from your switch panel over to activate the relay. Use 16 gauge from the relay to ground also.

buzzinhalfdozen · 11-01-2021, 03:54 PM

you really should have the master battery switch off while charging, voltage can get pretty high while charging 16 volt batteries. other than that you could measure the amp draw of your pump, could have an issue with the pump motor but i'd lean more towards the charger being hooked up as your problem.

Jeff Niceswanger · 11-01-2021, 04:10 PM

Quote:

Originally Posted by buzzinhalfdozen

you really should have the master battery switch off while charging, voltage can get pretty high while charging 16 volt batteries. other than that you could measure the amp draw of your pump, could have an issue with the pump motor but i'd lean more towards the charger being hooked up as your problem.

I never did Joe. I cooled the motor, ran the valves and never had any issues with 16 volts. But I had the car completely relayed. And I had a MSD suppressor/capacitor (MSD 8830) on both my Holley FI and MSD Grid's main power wiring.

buzzinhalfdozen · 11-01-2021, 04:26 PM

Jeff, yes a relay would be the correct way to wire the pump, however it still needs to be fused or protected by a circuit breaker. A 20 amp breaker should have no issues providing the needed amps for the water pump which i doubt pulls more than 10 amps. that's why i suggested he test the amp draw of the pump motor, also verify the ground is good. I have accidentally forgot to turn off my disconnect a few times and had no issues, but my car has a relay center in it so the only thing getting that 19plus volts was my MSD box. Hope you're enjoying your retirement!

Gmirza · 11-01-2021, 09:52 PM

I use a Summit fuel pump relay to power the water pump drive and a 20 amp inline fuse. So far so good.

11-01-2021, 02:26 PM	#1
GTS340 Senior Member Join Date: Feb 2017 Location: Las Vegas, Nv Posts: 871 Likes: 272 Liked 1,345 Times in 410 Posts	water pump circuit breaker pops I use a Moroso switch panel that has snap action model MB1 20 amp breakers. After switching to a 16 volt battery. If I'm charging the battery and running the water pump at the same time it pops the circuit breaker for the pump. After they pop a couple times they're toast.. Any suggestions on a good fix for this. present breaker https://www.radwell.com/en-US/Buy/SN...xoCnHkQAvD_BwE I did find this 50 amp breaker that might fit the hole okay. https://www.monsterscooterparts.com/...BoCD3EQAvD_BwE Thanks Paul Haszlauer

11-01-2021, 02:47 PM	#2
Jeff Niceswanger Senior Member Join Date: Jul 2003 Posts: 894 Likes: 686 Liked 1,034 Times in 368 Posts	Re: water pump circuit breaker pops You probably already know this...But a much better fix is to use the switch panel to activate a 30 or 40 amp relay. That way your using minimal voltage to pull the relay in. Run at least 12 gauge wire from your battery to the relays input wire (You don't have to but I would install a 30 amp breaker or fuse), then another wire from the relays output wire down to the Water Pump itself. You can just use little 16 gauge from your switch panel over to activate the relay. Use 16 gauge from the relay to ground also. __________________ Jeff Niceswanger 3740 SS Last edited by Jeff Niceswanger; 11-01-2021 at 03:59 PM.

11-01-2021, 03:54 PM	#3
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 984 Likes: 0 Liked 11 Times in 8 Posts	Re: water pump circuit breaker pops you really should have the master battery switch off while charging, voltage can get pretty high while charging 16 volt batteries. other than that you could measure the amp draw of your pump, could have an issue with the pump motor but i'd lean more towards the charger being hooked up as your problem. __________________ Joe Buchanan SS/BX 3117

11-01-2021, 04:26 PM	#5
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 984 Likes: 0 Liked 11 Times in 8 Posts	Re: water pump circuit breaker pops Jeff, yes a relay would be the correct way to wire the pump, however it still needs to be fused or protected by a circuit breaker. A 20 amp breaker should have no issues providing the needed amps for the water pump which i doubt pulls more than 10 amps. that's why i suggested he test the amp draw of the pump motor, also verify the ground is good. I have accidentally forgot to turn off my disconnect a few times and had no issues, but my car has a relay center in it so the only thing getting that 19plus volts was my MSD box. Hope you're enjoying your retirement! __________________ Joe Buchanan SS/BX 3117

11-01-2021, 09:52 PM	#6
Gmirza Member Join Date: Dec 2018 Location: Massachusetts Posts: 177 Likes: 204 Liked 253 Times in 95 Posts	Re: water pump circuit breaker pops I use a Summit fuel pump relay to power the water pump drive and a 20 amp inline fuse. So far so good. __________________ George Mirza D/SA 1236 ‘71 Duster 340