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Q: How do I adjust the maximum motor current settings?

Step 1: Stop the Pump

You must not adjust operational settings while the pump is running.

  • Action: Press the On/Off button on the screen or the base of the inverter to stop the motor.

Step 2: Access the Password Screen

  • Action: Press the UP or ESC button repeatedly until the screen displays the inverter's Model Number.
  • Action: Press Enter. The screen will display "Verify the PW" with four zeros (0000).

Step 3: Enter the Specific Password for Current Settings

Adjusting the max current requires a specific access code rather than the standard user password.

  • The Code: Use password 9579 to access the AC Out Max Current setting.
  • How to input:
    1. Use the UP/DOWN buttons to change the first digit to 9.
    2. Press Enter to move to the next digit.
    3. Repeat until the screen shows 9579, then press Enter one final time to open the setting.

Step 4: Calculate and Adjust the Ampere Value

Once inside the "AC Output Maximum Ampere" screen, you can change the current limit.

  • Calculation Rule: The recommended setting is 1.5 times the motor's rated current (e.g., if your motor is rated for 10A, set the inverter to 15A).
  • Maximum Limit: The maximum allowable setting is 2 times the rated current.
  • Action: Use the UP/DOWN directional buttons to reach your calculated number and press Enter to confirm the value.

Step 5: Apply the Changes (The Power-Cycle Rule)

Operational settings like current limits are not applied until the system is fully restarted.

  • Action: Turn off the Solar Isolator switch (and any AC backup power).
  • Wait: Count out 10 seconds or until the inverter screen goes completely blank.
  • Action: Turn the isolator back on. The inverter will load the main screen, and the pump should restart automatically with the new current limit active.

Why adjust this setting? (Troubleshooting)

If your inverter frequently stops with an "OFF (AC Out O-A)" or "Error E8" message, it means the pump is drawing more current than this setting allows. Adjusting this to 1.5x the rated motor current provides the necessary overhead for the pump to handle varying loads without triggering an overload shutdown.