Battery Short?

SeanadirondacksSeanadirondacks Posts: 20Registered Users ✭✭
In a battery bank of 4 -12 volt yellow tops strung in parallel. If 3 read 13.7 while charging but one reads 12.5. Should that battery be removed from the bank due to short? Thanks.

Comments

  • VicVic Posts: 2,903Solar Expert ✭✭✭✭

    Hello Sean ..,

    Just my opinion,   but,  if you have four batteries in PARALLEL,   and you are getting a significantly different reading when using your DMM to measure between the two TERMINALS on one battery,  then there is a very poor connection somewhere.  Make sure that you are measuring the battery terminals.

    This type of situation is one of the reasons,   that parallel battery strings are so problematic for almost all who try to use them.

    Clean all battery terminals,   and lugs on the battery cables,   carefully.  Measure the voltage of each battery,  when interconnects are not connected.   Use petroleum jelly on all of these contact surfaces,   and reassemble.

    IMO,   Vic

    Off Grid - Two systems -- 4 SW+ 5548 Inverters, Surrette 4KS25 1280 AH [email protected], 11.1 KW STC PV, 4X MidNite Classic 150 w/ WBjrs, Beta KID on S-530s, MX-60s, MN Bkrs/Boxes.  25 KVA Polyphase Kubota diesel,  Honda Eu6500isa,  Eu3000is-es, Eu2000,  Eu1000 gensets.  Thanks Wind-Sun for this great Forum.
  • EstragonEstragon Posts: 2,750Registered Users ✭✭✭✭
    In addition to Vic's advice, which is certainly appropriate, I would remove the low battery, try charging it on its own, and keep an eye on battery temp while doing so.
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
  • mcgivormcgivor Posts: 2,164Solar Expert ✭✭✭✭✭
    edited April 3 #4
    @Seanadirondacks if using batteries in parallel, please read the information in the link, it will answer many questions you may  have not thought about yet. https://www.solar-electric.com/learning-center/batteries-and-charging/deep-cycle-battery-faq.html#Temperature Effects on Batteries
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery bank 

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