Battery too low

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  Bayliss Member Posts: 1,299

  May 2023 edited May 2023

  @mrbob, what type of battery do you have, and how old is it?  Additionally, are you testing the battery with the 120V/30amp AC disconnected and with the trailer power disconnected from your tow vehicle?  
  
  Also, you might want to disconnect your battery, wait 30 minutes (or longer) and then check what the "rested" battery reading is on your meter.
  
  This discussion may be of interest:
  
  https://tab-rv.vanillacommunity.com/discussion/comment/175056#Comment_175056
  

  2019 T@B 320 S Boondock Lite; 2007 Toyota Tundra 4x4
  (Alde: 3020; Refrig: Isotherm Cruise 65 Eleg; Battery: BB 100Ah LiFePo4; Solar: Renogy 100Ah Suitcase; Victron BMV-712; Pwr Cntr: PD-4135KW2B; EMS: PI-HW30C)
  Greg & Marlene (Tucson, AZ)
  
  
  

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  pthomas745 Moderator Posts: 3,670

  May 2023

  @MrBob, welcome to the Forums.

  You are on: shore power?  Battery only?  the 9.5 is the voltage readout on the See Level?  And the 12.9 is the readout from a multimeter or some other device at the battery?

  The advice from Bayliss (unplug, turn off battery switch) use your Multimeter on your rested battery will give you a good start on sorting this out. 
  

  2017 Outback

  Towed by 2014 Touareg TDi
  

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  Mickerly Member Posts: 355

  May 2023

  Having voltage when you are not using the battery, then it mysteriously disappears as soon as there is a load is normal for a failing battery. Start having the battery tested. Most auto parts places will test the battery for free. If the battery is good, then the power is disappearing on its way to the Alde. That's a different problem.
  

  2018 320CS-S
  "Just Enough"

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