Verifying Core Parameters (280Ah vs. 314Ah)


Now that your AmpBox is powered on, the most important step is confirming that the JK‑PB2A16S internal settings match your specific cell capacity. While your AmpBox is pre‑configured, verifying these values ensures accurate SOC readings and proper balancer behavior.

Step 1: Accessing Settings
  • Open the JK BMS App and select your device.
  • Tap the Settings tab at the bottom.
  • Enter the administrative password: 123456 (Some firmware versions use 1234.)
Step 2: Calibrating Battery Capacity

The BMS uses the Total Capacity value to calculate SOC. If this is incorrect, your battery may show 20% when it’s actually nearly empty.

  • 280Ah Models: Set Battery Capacity to 280Ah.
  • 306Ah Models: Set to 306Ah.
  • 314Ah Models: Set to 314Ah.
  • Cycle Capacity: Set this to the same value as above.
Step 3: Essential Voltage Thresholds for AmpBox Cells

For the high‑capacity EVE or REPT LiFePO4 cells used in AmpBoxes, these industry‑standard values balance longevity and performance:

Parameter Recommended Setting
Cell Count 16S
Cell High Volt Protection 3.65V
Cell High Volt Recovery 3.50V
Cell Low Volt Protection 2.50V
Cell Low Volt Recovery 3.00V
Balance Start Voltage 3.40V

Tip: Setting Balance Start Voltage to 3.40V ensures the 2A active balancer only works at the top of the charge curve, where balancing is most effective.

Step 4: Calibration of Current (SOC)

If SOC seems inaccurate (e.g., showing 100% below 53V), or if current shows a phantom load:

  • Ensure no loads are running.
  • Use Current Calibration or Set SOC to 100% once fully charged (55.2V–56.0V total pack voltage).
Step 5: Safety Limits (Charge / Discharge)
  • Max Charge Current: Must not exceed your AmpBox model rating (e.g., 150A for 15P, 200A for 20P).
  • SCP (Short Circuit Protection): Leave at factory defaults to avoid nuisance trips during inverter inrush.

Summary: Your BMS now knows the exact capacity and voltage profile of your AmpBox. With these settings verified, your SOC readings, balancer behavior, and inverter communication will all be accurate.

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