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Delta M42U - User Manual

Delta M42U
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M42U
M36U
M28U
Operation and Installation Manual
Grid-tie Transformerless Solar Inverter
The power behind competitiveness
www.deltaww.com

Table of Contents

Questions and Answers

  • K
    Kevin BaileySep 1, 2025
    What does AC Surge DC Surge error mean on my Delta Inverter?
    • D
      Daniel MooreSep 1, 2025
      If your Delta Inverter displays 'AC Surge DC Surge', possible causes include: 1. The inverter was struck by lightning, so check the inverter’s status. 2. One or more SPD are defective, so replace the defective SPD. 3. One or more SPD are disconnected, so check the connections of SPDs. 4. A detection circuit malfunction, so check the connection in AC terminal. 5. Wrong connection in AC terminal, so contact customer service for technical support.
  • P
    Phillip FloydSep 12, 2025
    What does HW DSP ADC3 (F17) error mean on my Delta M42U?
    • J
      jacksontamaraSep 12, 2025
      If your Delta Inverter displays 'HW DSP ADC3 (F17)', the issue might be: 1. Insufficient input power, so check the input voltage, which must be >150Vdc. 2. Auxiliary power circuitry malfunction, so check the auxiliary circuitry inside the inverter. 3. A detection circuit malfunction, and you should contact customer service for technical support.
  • G
    George MoralesAug 30, 2025
    How to troubleshoot Solar1 High (E30) error on Delta M42U?
    • T
      Theresa MartinAug 30, 2025
      If your Delta Inverter shows 'Solar1 High (E30)', it might be caused by: 1. MPPT 1 input voltage being over 1000Vdc, so modify the solar array setting to make the Voc less than 1000Vdc. 2. A detection circuit malfunction, and you should contact customer service for technical support.
  • E
    Elizabeth StarkSep 14, 2025
    What does HW COMM1 (F23) error mean on my Delta M42U Inverter?
    • K
      Karen KirbySep 14, 2025
      If your Delta Inverter displays 'HW COMM1 (F23)', it could be due to: 1. DSP is idling, so contact customer service for technical support. 2. The communication connection is disconnected, so check the connection interface RS-485. 3. The communication circuit is malfunction, so check the communication card.
  • D
    daniel00Sep 14, 2025
    What does HW Eff. (F20) error mean on my Delta M42U Inverter?
    • S
      stevenjenkinsSep 14, 2025
      If your Delta Inverter is showing 'HW Eff. (F20)', the possible causes are: 1. The calibration is incorrect, so check the accuracy of current and power. 2. The current feedback circuit is defective, so check the current feedback circuit inside the inverter.
  • D
    Dale ButlerSep 18, 2025
    What does Bus Unbal. (F30) error mean on my Delta Inverter?
    • D
      David GonzalesSep 19, 2025
      If your Delta Inverter displays 'Bus Unbal. (F30)', it may be caused by: 1. Not totally independent or parallel between inputs, so check the inputs connections. 2. PV Array short to Ground, so check the PV Array insulation. 3. Driver for boost is defective or disconnected, so contact customer service for technical support.
  • H
    Heather KellySep 23, 2025
    What does DC Cur. High (F60, F61, F70, F71) error mean on my Delta M42U?
    • R
      Rhonda LewisSep 23, 2025
      If your Delta Inverter is showing a 'DC Cur. High (F60, F61, F70, F71)' error, the possible causes are: 1. Switching device in boost is defective, so check all switching device in boost. 2. Driver for boost is defective, so check the driver circuit for boost inside the inverter. 3. Input current detection circuit malfunction, so check input current detection circuit.
  • B
    benjaminrobinsonAug 27, 2025
    What causes AC Freq Low (E02) on my Delta M42U and how to resolve it?
    • B
      Brandon ColeAug 27, 2025
      If your Delta Inverter displays 'AC Freq Low (E02)', the issue might be due to several reasons: 1. The actual utility frequency is under the UFR setting, so check the utility frequency. 2. The Grid code or Grid setting is incorrect, so check them. 3. If the issue persists, there may be a detection circuit malfunction, and you should contact customer service for technical support.
  • W
    William KaneAug 26, 2025
    How to fix AC Freq High (E01) error on my Delta M42U?
    • R
      Richard WrightAug 26, 2025
      If the Delta Inverter displays 'AC Freq High (E01)', it could be due to several reasons: 1. The actual utility frequency is over the OFR setting, so check the utility frequency. 2. The Grid code setting is incorrect, so check it. 3. In case the issue persists, there may be a detection circuit malfunction, and you should contact customer service for technical support.
  • M
    Mrs. Christy JohnsonAug 25, 2025
    Why does my Delta M42U Inverter show 'No Grid (E09)' error?
    • W
      William HooverAug 26, 2025
      If your Delta Inverter is showing a 'No Grid (E09)' error, the possible causes are: 1. The AC breaker is OFF. In this case switch on the AC breaker. 2. There is a disconnection in the AC terminal. In this case check the connection in the AC terminal and ensure it connects to the inverter.

Delta M42U Specifications

General IconGeneral
Max. DC Voltage1100 V
AC Voltage400 V
Efficiency98.6%
Output Voltage400 V
Frequency50/60 Hz
Communication InterfaceEthernet, RS485
MPPT Voltage Range200-1000 V
Input Voltage200-1000 V

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