Stabilizes parallel machine communication if you are running multiple inverters in a single-phase or three-phase setup. Pre-Update Checklist: Crucial Safety Precautions
Completely power down the inverter by disconnecting the battery breaker. Wait 2 minutes for the internal capacitors to drain completely.
Before updating the firmware:
Reconnect the battery, turn the inverter switch back , and check the LCD menu settings to verify that the new firmware version number is displayed. Reconnect your PV solar panels and grid inputs. 5. Troubleshooting Common Update Failures Symptom / Error Root Cause "Record Error" or "Open Serial Port Fail" The software cannot see the inverter. easun firmware update
Download the required USB driver (usually CH340 or Prolific drivers) so your computer recognizes the inverter connection.
Because Easun constantly updates its internal components, public forums often host outdated or mismatched firmware files that can harm your machine. To get the exact firmware for your serial number:
What or feature are you trying to fix or unlock with this update? What current firmware version does your LCD screen display? Stabilizes parallel machine communication if you are running
: Firmware is specific to the hardware version (e.g., SMG II, ISolar SMX, IGrid). Installing the wrong firmware can permanently brick your inverter. Check Current Version
This guide outlines the standard procedure for updating the firmware on EASUN POWER solar inverters. Firmware updates can resolve software bugs, improve battery compatibility (especially for LiFePO4), and optimize charging logic. ⚠️ Critical Pre-checks Identify Your Model
Right-click the update application ( .exe ) and select . Before updating the firmware: Reconnect the battery, turn
: You must completely exit WatchPower or other monitoring software to release the COM port for the reflash tool. Execute the Update : Open the Reflash/Update tool .
Click or Browse to load the firmware file (usually a .hex , .bin , or .inv file). Double-check that the file name matches your architecture. Phase D: Execute the Update Click Update or Start .
Many users update to access optimized fan algorithms that reduce noise during low-load periods.
If the update fails, do not panic. Turn the unit off and on again, and repeat the process.