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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.
  • J
    Jo ValdezSep 2, 2025
    Why is my Delta Inverter showing a Temperature (F07) error?
    • M
      Michelle GarzaSep 2, 2025
      If the Delta Inverter displays 'Temperature (F07)', it could be due to: 1. Ambient air is less than -30?, so check the installation ambient and environment. 2. A detection circuit malfunction, and you should contact customer service for technical support.
  • A
    acarterSep 3, 2025
    What does Solar1 Low (W01) error mean on my Delta M42U Inverter?
    • C
      Christopher EspinozaSep 3, 2025
      If your Delta Inverter is showing a 'Solar1 Low (W01)' error, it might be because: 1. MPPT 1 input voltage is under the limit, so check the MPPT 1 voltage connection to the inverter terminal. 2. Some devices were damaged inside the inverter if the actual MPPT 1 voltage is close to "0", so check all switching devices in boost1. 3. There is a detection circuit malfunction, and you should contact customer service for technical support.
  • Y
    yrichardsonSep 3, 2025
    What does the Solar2 Low (W02) error indicate on my Delta M42U?
    • S
      Stacy AlvaradoSep 3, 2025
      If your Delta Inverter displays 'Solar2 Low (W02)', it may be caused by: 1. MPPT2 input voltage is under the limit, so check the MPPT 2 input voltage connection at the inverter terminal. 2. Some devices were damaged inside the inverter if the actual MPPT 2 voltage is close to "0", so check all switching devices in boost2. 3. A detection circuit malfunction, and you should contact customer service for technical support.
  • D
    Dawn CooperSep 4, 2025
    What to do if the Delta Inverter displays 'Ext Fan Fail Int Fan Fail (W11)'?
    • S
      Sandra BartlettSep 4, 2025
      If your Delta Inverter displays 'Ext Fan Fail Int Fan Fail (W11)', the possible causes are: 1. One or more fans are locked, so remove the object that stuck in the fan(s). 2. One or more fans are defective, so replace the defective fan(s). 3. One ore more fans are disconnected, so check the connections of all fans. 4. A detection circuit malfunction, and you should contact customer service for technical support.
  • M
    morrisveronicaSep 5, 2025
    What does HW NTC1 Fail (F06) error mean on my Delta Inverter?
    • M
      Melissa NovakSep 5, 2025
      If your Delta Inverter shows 'HW NTC1 Fail (F06)', it might be due to: 1. Ambient temperature >90 ? or
  • R
    Rebecca JuarezSep 6, 2025
    What should I do if my Delta Inverter shows HW NTC2 Fail (F08)?
    • T
      Tiffany BellSep 6, 2025
      If your Delta Inverter displays 'HW NTC2 Fail (F08)', it could be due to: 1. Ambient temperature >90 ? or
  • L
    Lindsey CareySep 7, 2025
    What causes HW NTC3 Fail (F09) error on my Delta Inverter?
    • K
      kristinortizSep 7, 2025
      If your Delta Inverter displays 'HW NTC3 Fail (F09)', the problem might be: 1. Ambient temperature >90 ? or

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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