Plug the communication cable into the inverter's "COM" or "RS232" port and your laptop. Identify the COM Port: Device Manager
Mike from Arizona had an Easun iSolar 5.5KW that would shut down at 10% SOC (State of Charge) with his LiFePO4 bank. After updating to firmware version U1 74.12 (originally for Voltronic), his inverter correctly ran his batteries down to 5% SOC, adding 2.5kWh of usable capacity per cycle. easun firmware update
Use the serial-to-Ethernet (RJ45) cable provided with your unit, as pin configurations vary by model. RS232 to USB Adapter: Plug the communication cable into the inverter's "COM"
Ensure the inverter is in "Standby" mode (AC output turned off via the physical switch) but still powered by the battery. Use the serial-to-Ethernet (RJ45) cable provided with your
Click "Update" or "Start." You will see a progress bar. The inverter’s fans may spin at full speed, and the screen may go blank or show "UP"—this is normal. Step 5: Restart and Verify