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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

  • A
    Amanda LynchAug 25, 2025
    What should I do if my Delta M42U Inverter displays AC Volt Low (E10, E15, E20)?
    • P
      Patrick LivingstonAug 25, 2025
      If your Delta Inverter displays 'AC Volt Low' (E10, E15, E20), the issue might stem from a few potential causes. Initially, verify that the actual utility voltage is within the suitable range, as it may be under the UVR setting. Also, incorrect Grid code or Grid settings could be the cause, so check them. Another potential cause is wrong connections in the AC terminal, so check the AC terminal connections. If these steps don't resolve the issue, there might be a detection circuit malfunction, in which case 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.
  • 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.
  • 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.
  • B
    Brian BellAug 27, 2025
    What does Insulation (E34) error mean on my Delta M42U Inverter?
    • R
      Rachel AguilarAug 27, 2025
      If your Delta Inverter displays 'Insulation (E34)' error, possible causes include: 1. A PV array insulation fault, so check the insulation of Solar inputs. 2. Large PV array capacitance between Plus to Ground or Minus to Ground or both, so check the capacitance, and dry PV panel if necessary. 3. If none of the above steps work, there may be a detection circuit malfunction, and you should contact customer service for technical support.
  • G
    Gregory PerryAug 28, 2025
    Why is my Delta M42U Inverter showing a Temperature (F05) error?
    • C
      christopherleeAug 28, 2025
      If your Delta Inverter shows 'Temperature (F05)' error, it may be due to: 1. The ambient air being over 60? (The installation is abnormal), so check the installation ambient and environment. 2. A detection circuit malfunction, and you should contact customer service for technical support.
  • A
    Anthony LivingstonAug 29, 2025
    What does AC Con. Fail (E08) error mean on my Delta Inverter?
    • M
      Michael HamiltonAug 29, 2025
      If your Delta Inverter displays 'AC Con. Fail (E08)', it could be due to: 1. Wrong connection in AC terminal, so check the AC connection in accordance with the user manual. 2. A detection circuit malfunction, and you should contact customer service for technical support.
  • D
    davidgriffithAug 30, 2025
    What does DC Injection (F01, F02, F03) mean on Delta M42U Inverter?
    • G
      griffinnathanAug 30, 2025
      If the Delta Inverter displays 'DC Injection (F01, F02, F03)', it might be because: 1. The utility waveform is abnormal, so check the utility waveform and ensure the grid connection of the inverter is far away from any non-linear load if necessary. 2. There is 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.
  • A
    Antonio BauerAug 23, 2025
    What to do if my Delta M42U Inverter shows AC Volt High (E11, E13, E16, E18, E21, E23)?
    • H
      Holly HolmesAug 23, 2025
      If the Delta Inverter shows 'AC Volt High' (E11, E13, E16, E18, E21, E23), it could be due to several reasons. First, the actual utility voltage might be over the OVR setting, so check the utility voltage. Second, the utility voltage might be over the Slow OVR setting during operation, so check the Grid code and Grid setting. Third, the Grid code or Grid setting might be incorrect, so check the connection in the AC terminal. If none of these solves the problem, there may be a detection circuit malfunction, and you should contact customer service for technical support.

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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