Before attempting an update, ensure you have the following hardware and software to avoid "bricking" the device:
Once the tool shows "Update Successful," the inverter will reboot. Check the "U1" (Main CPU) and "U2" (Secondary CPU) versions in the settings menu. ⚠️ Critical Safety Warnings Don't Disconnect:
Most EASUN models (SMH, SML, SPL, SPH) share similar procedures. Step 1: Check Current Version
Real-world experiences highlight both the potential rewards and significant risks.
Plug the communication cable into the inverter's "COM" or "RS232" port and your laptop. Identify the COM Port: Device Manager
: Easun provides manuals and some software links on their official help center .
Even with careful preparation, problems can occur. Here is a list of common errors and how users have addressed them:
Display blank, buttons unresponsive, no AC output, and often the WiFi module remains powered but cannot connect. The flashing tool may indicate the update was "OK".
Before downloading random .hex files from the internet, you need to understand why you are doing this. Easun does not push automatic over-the-air updates. You must manually intervene. Common reasons include:
Close all background programs, especially third-party solar monitoring software that might compete for the serial COM port.
Use a stable Windows laptop or PC. Ensure it is connected to a power outlet so it does not enter sleep mode or shut down.
This guide synthesizes collective user experiences to help you navigate the firmware update process. Do you know the specific model of your Easun inverter? Sharing that could help in finding more targeted information.
Because Easun hardware is usually a clone of Voltronic (Axpert), many users successfully flash onto their Easun units.
If you decide to proceed:
Another user sought an update from Easun, but when they provided the files, they did not include any instructions, leaving the user to guess at the correct procedure and ultimately leading to a bricked unit. Their subsequent attempts to contact support were frustratingly slow or received no response.
Plug the RJ45 end of your cable into the inverter's computer port and the USB end into your laptop. Identify COM Port:
EASUN does not host a public, universal download portal for firmware files due to the high risk of users downloading incorrect versions. Contact Official Support