water pump power problems

ClayBanks
ClayBanks Member Posts: 6
in Heating/Plumbing & Winterizing
2021 TAB 320S.  Connected to shore power everything works. Disconnect from shore power and lights, refrigerator, tv and radio work UNTIL the water pump engages either by turning it on with inside or outside switch or opening any value. Reconnect to shore power and everything works, pump included.  No blown fuses, no tripped breakers and the batteries are at 100%.

Any comments or ideas as to what's happening?

Thanks

Comments

  • rfuss928
    rfuss928 Member Posts: 1,181
    edited October 2024
    The water pump draws relatively high current.  If your battery is marginal it could easily pull the system voltage too low for the other loads to operate.  When connected to shore power the converter has no problem delivering higher current and maintaining proper system voltage.
    Measure battery voltage while the pump is running with and without shore power to verify this guess...

  • jbajor
    jbajor Member Posts: 233
    I completely concur with rfuss.  look at the voltage at the battery with pump on and with pump off (off of shore power..  I suspect it is dropping below 11v when it is on...  I had the same issue and it turned out my battery was toast.
    Ultimate Toys Teardrop Camper
    Volvo XC-40
    SF Bay Area, California
  • ClayBanks
    ClayBanks Member Posts: 6
    interesting. Except that the power completely shuts down when I turn the pump on,  But I'll check. 
  • pthomas745
    pthomas745 Administrator, Moderator Posts: 4,594
    What battery do you have? 
    2017 Outback
    Towed by 2014 Touareg TDi
  • ClayBanks
    ClayBanks Member Posts: 6
    I have 2 Lionenergy Safari UT 1300s
  • ClayBanks
    ClayBanks Member Posts: 6
    Upon further review, and a YouTube video search, one battery is at 80% and the second is at 60% charge.
  • Horigan
    Horigan Member Posts: 880
    I would also clean the battery terminals and cable ends.
    Rich
    2019 T@b 400
    2025 Toyota Highlander 2.4L Turbo
    Bellingham WA
  • jbajor
    jbajor Member Posts: 233
    The 'power center' will shut down if it does not have enough operation voltage...  that will take down everything 
    Ultimate Toys Teardrop Camper
    Volvo XC-40
    SF Bay Area, California
  • Marceline
    Marceline Member Posts: 1,757
    edited October 2024
    ClayBanks said:
    Upon further review, and a YouTube video search, one battery is at 80% and the second is at 60% charge.
    How are you measuring that?
    San Francisco Bay Area
    2013 CS-S us@gi
    2015 Toyota Tacoma PreRunner Double Cab
  • ClayBanks
    ClayBanks Member Posts: 6
    By pushing the button on top of the battery.
  • Marceline
    Marceline Member Posts: 1,757
    ClayBanks said:
    By pushing the button on top of the battery.
    I have a LiON energy battery too. I don't know how accurate those lights are. Was your trailer connected to shore power when you checked the battery SOC with the idiot lights? 
    San Francisco Bay Area
    2013 CS-S us@gi
    2015 Toyota Tacoma PreRunner Double Cab
  • ClayBanks
    ClayBanks Member Posts: 6
    Didn't mean to ghost anyone, just been out of town. Appears to be a battery/charging issue, like you all said. 
    The TAB is parked in my driveway, facing north, in a fairly shaded spot, so the solar panel gets limited sun. It's noon and the vitron app says the charger is off. It's been that way for a week. I checked the "idiot lights" yesterday afternoon and they were at 20 and 40. Nothing, lights, fan, tv, water pump, would come on.
    Connected to shore power last night, disconnected this morning, ILs were at 100%. Everything worked. Did not check water pump though. left everything on and am watching ILs to guess power consumption.

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