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  • Ask Technical Questions about Pytes Products

    Strange Battery Bank discharge behaviour

    Posted by Screech on August 12, 2026 at 9:11 pm

    Dear all,

    I have a battery bank consisting of six Pytes E-Box 48100R (B model) these batteries where purchased together, installed and became operational at the same time. They are connected via an open-loop connection to an MPP Solar inverter model LV5048.

    The inverter parameters are configured as follow:

    · Bulk/Absorb = 56.8V

    · Float = 56.0V

    · Absorb Time = < 15 minutes

    · Equalization = DISABLED

    Now am experiencing the following weird behavior: One of the 6 batteries during discharge from 100-45% is being drained (SOC drops slower) at a much slower rate than the remaining 5 batteries. After 45% SOC this battery suddenly start being discharged at a much higher rate (SOC drops faster) than the other 5 batteries. This is illustrated in below

    – Beginning of Discharge (Cycle SOC 100- 50%)

    -End of Discharge Cycle (<50%):

    If I remove the affected battery from the battery bank and charge it separate l see that its SOC jumps from approx. 70% straight to 100 % while the SOC of the other batteries jump from 90% to 100%

    Notes:

    1. -All the batteries are running the same firmware which is version SPBMS16SRPV1.3.35.C16 (2025-04-24).

    2. There are no errors or warnings

    Any idea what could be causing this affected battery to behave like that and have a negative impact on the entire battery bank? how can I have it resolved?

    Initial discharge
    End discharge
    Screech replied 1 month, 3 weeks ago 2 Members · 2 Replies
  • 2 Replies

  • pytes-ess

    Member
    August 18, 2026 at 4:17 pm

    Hi Screech, could you please provide more data to help us accurately diagnose the issue?

    • Screech

      Member
      August 18, 2026 at 10:18 pm

      Attached I am sending some collected information from the Batteries. For each battery I have collected the output of the following commands:

      -info

      -pwr

      -bat

      -datalist event 0

      -datalist history 0

      Note: the battery with the issue is battery 5

      • This reply was modified 1 month, 3 weeks ago by  Screech.
      Bat-1.txt 430 KB Text File - Click to view
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      Bat-2.txt 426 KB Text File - Click to view
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      Bat-3.txt 425 KB Text File - Click to view
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      This file was truncated for preview. Please download to view the full file.
      Bat-4.txt 427 KB Text File - Click to view
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      This file was truncated for preview. Please download to view the full file.
      Bat-5.txt 427 KB Text File - Click to view
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      This file was truncated for preview. Please download to view the full file.
      Bat-6.txt 427 KB Text File - Click to view
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      This file was truncated for preview. Please download to view the full file.

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