Q: Why isn't my screen turning on with Solar wired in?

Part 1: Measuring Incoming DC Voltage from Solar

Use this test if your screen is blank or showing a "Low Voltage" error to confirm if your solar panels are providing enough power.

1. Set Up the Multimeter: Turn the dial to DC Voltage, usually marked with a V and a straight line with three dots underneath. Select a range high enough for your system (e.g., 600V).
2. Connect Probes: Plug the Black probe into COM and the Red probe into the socket marked V.
3. Prepare the Inverter: Turn on the solar isolator switch. If your inverter uses MC4 connectors, you may need to unplug them to measure the bare pins, or measure at the screw terminals inside the unit if it is a wall-mounted type.
4. Take the Reading:
   • Touch the Red probe to the Positive (+) wire or terminal (labelled P+).
   • Touch the Black probe to the Negative (-) wire or terminal.

1. Interpret the Result:

• 230V Inverters: The voltage should be between 150V and 450V DC.
• 380V Inverters: The voltage should be between 400V and 800V DC (up to 900V for some models).
• If the reading is below the Minimum DC input voltage listed on your inverter's specification sticker, the system will not boot.