while the progress bar fills up. This usually takes 2 to 10 minutes.
Locate the silver specification sticker on the side of your inverter. Note down the exact model name (e.g., ISolar SMG II 5K , iSolar SPH 5KW , SMX II 5.6KP ). Find the Current Firmware Version
Go to the LCD menu on your inverter and find the U1 (Main CPU) and U2 (Secondary/Remote CPU) versions. You must match these versions exactly.
You will likely need the RS232 to Ethernet adapter cable that came with the inverter. easun firmware update
Wrong firmware file version was forced onto the mainboard.
Ensure your battery is connected and fully charged. Never attempt a firmware update while the inverter is running strictly off unstable solar or AC power. Software: Download the correct firmware from EASUN Power .
Before you connect your laptop to your inverter, it helps to understand why you are updating it. Firmware acts as the central nervous system of your inverter, dictating how it handles charging voltages, grid switching, and load management. You should typically consider an update if you are: while the progress bar fills up
A power loss during a firmware flash will corrupt the flash memory. Ensure your battery bank is charged above 50% and stable. Do not rely solely on solar panels (PV), as passing clouds can cause voltage drops that interrupt data transmission. 3. Use the Correct Data Cable
: A serial (RS232) to USB cable is generally required. Some newer models support updates via Wi-Fi through a smartphone interface. 3. Step-by-Step Update Process
If you encounter issues during or after the update, stay calm and logical. Most problems stem from connection issues rather than hardware failure. Software Says "Connection Timeout" or "Open COM Port Fail" Note down the exact model name (e
It typically takes between 3 to 8 minutes. Step 5: Verification and Reboot
Executing the update requires a direct tether between your Windows PC and the inverter. Step 1: Gather Your Tools Windows-based Laptop or PC. Original communication cable (RJ45-to-USB or RS232-to-USB).
The safest way to get firmware is by contacting EASUN directly through their official website or the store where you purchased the unit (e.g., AliExpress official store).
Alternatively, connect your inverter to a computer via video/serial cable and open or SolarPower software to view the current versions in the device information tab. Step 2: Source the Correct Firmware File