Frequently Asked Question

Firmware: MultiPlus Inverter
Last Updated 2 years ago

Updating Firmware and Programming a MultiPlus Inverter

What you are trying to accomplish:

Victron inverters don’t always ship out from the factory with the latest version of firm. You will want to install the latest version of the firmware and install the custom settings that depend on the type of battery bank you are using. The firmware is developed by Victron. The custom settings are developed by AM Solar to work with the systems that we designed.

What you need:

  • PC computer with an internet connection and a USB port
  • Philips screw driver
  • MK3-USB adapter cable
  • RJ45 cable
  • Victron Multiplus Inverter (Obviously)

Step 1:

Download the communication software from Victron

You will need the latest versions of VEFlash and VEConfig downloaded from the Victron website onto your PC.

  1. Go to this website:
  2. On the right side of the page click the download link for VE Configuration tools and download the file to your desktop.
  3. Double click VECSetup_A on your desktop.
  4. Your PC may prompt you with a message “Do you want to allow...” click YES.
  5. A window will pop up that says “Welcome to the VE Configure tools Setup Wizard”. Click Next>.
  6. The window will say “Select Additional Tasks”, check the boxes next to VEConfig and VEFlash,this will put the programs on your desktop so you can find them easily. Click Next>.
  7. The window will say “Ready to Install”, click Install.
  8. The window will say “Completing the VE Configure tools Setup Wizard”, uncheck Start VEConfig when setup finished, and click Finish.

Step 2:

Download the program files from the AM Solar website.

  1. Go to:
  2. Scroll down to the black boxes with white lettering with labels “Firmware” and “Battery settings.”
  3. Click to download the firmware corresponding to the inverter model that you are using, this is either MULTIPLUS 2000 or MULTIPLUS 3000, save the .vff file to your desktop.
  4. Click to download the appropriate battery settings for the type of system you have. This will be either “ESSENTIAL LITHIUM WITHOUT COLD CHARGE PROTECTION”, “ESSENTIAL LITHIUM WITH COLD CHARGE PROTECTION”, “V4 SIGNATURE LITHIUM” or “LIFELINE AGM”, save the file to your desktop

Step 3:

Preparing your inverter and physically connecting your PC

In order to do this step, your inverter system needs to be fully installed and connected to the battery bank.

  1. Turn the black inverter switch on the faceplate to the OFF position.
  2. Turn any breakers supplying the inverter with AC to the OFF position.
  3. Using a Philips screw driver remove the four screws on the inverter faceplate and remove the faceplate.
  4. Unplug all RJ45 cables.
  5. Plug the MK3-USB Adapter’s USB port into your PC’s USB port.
  6. Plug one end of an RJ45 cable into the MK3-USB Adapter’s port and plug the other end into one of the inverter’s ports.

Step 4:

Updating the firmware

If the steps on this list don’t exactly match up with what your computer does, you may want to try using a different PC. Sometimes the “Next>” button is missing. If that happens, just click ENTER to go to the next step.

  1. Find the VEFlash icon on your desktop and double click it.
  2. A “Welcome” screen will pop up. Click Start.
  3. The window will say “Select required action”, leave the toggle on “Update the firmware” and click Next>.
  4. The window will say “Warning”, click Next>.
  5. The window will say “Select file”, click Browse.
  6. Select the .vff firmware file you downloaded to the desktop in Step 2 and click Open, then click Next>.
  7. The window will say “Prepare your system”, click Next>.
  8. Turn the inverter ON by pushing the black button upward (away from the cables coming out the bottom).
  9. The window will say “Select a comport”, click Auto detect comport. A window will pop up while it searches for the comport. After the window disappears click Next>.
  10. The window will say “Connect part 1”, turn the inverter OFF by pushing the black button back toward the center position. Click Next>.
  11. The window will say “Connect part 2”, turn the inverter back ON with the black button. Click Next>.
  12. The window will say “Ready to program”, click Next>.
  13. The window will “Busy” as an animation shows data going into a microprocessor. When the animation stops, click OK.
  14. The window will disappear and your inverter firmware will have been updated.

Step 5:

Uploading battery settings

  1. Find the VEConfig icon on your desktop and double click on it.
  2. A warning window will pop up. Click OK. The warning will disappear, leaving the VEConfigure window.
  3. Click on the Port selection tab, mouse over Com port, click on Auto detect (not for MK1).
  4. After a couple seconds of initialization the window will show inverter status. Click on the File tab and click on Load settings.
  5. A browsing window will pop up. Select the battery settings file you downloaded in Step 2. Click Open.
  6. A window will pop up saying “It is not allowed to make this charge in the grid code...” Click No.
  7. Click on the Send settings button.
  8. Click on the “all settings” toggle, then click OK.
  9. A window will pop up saying “Would you like to send the assistant setup to the device?” Click Yes.
  10. A window will pop up saying “Writing block...” this will count through several blocks then disappear. A new window will pop up saying “Assistant setup successfully written to target.” Click OK.
  11. Congratulations, your inverter is now fully programmed. You can close out of the VE Configure program.

Step 6:

Put the inverter back together

  1. Turn the inverter OFF with the black button by pushing it down to the center position.
  2. Physically unplug the RJ45 cable that is connected to the MK3-USB adapter from the inverter.
  3. Reconnect any RJ45 cables that you unplugged in Step 3.4.
  4. Using a Philips screw driver, re-attach the inverter faceplate.
  5. Turn the inverter ON with the black switch.

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