Delta RPI Series - User Manual

Questions and Answers:

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Justin LewisAug 27, 2025
What to do if Delta RPI Inverter shows 'Solar1 Low' error?
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  richardwoodAug 27, 2025
  If your Delta Inverter displays a 'Solar1 Low' error, first check the Solar1 voltage connection to the inverter terminal, as the actual Solar1 voltage may be under the limit. If the actual Solar1 voltage is close to "0", some devices inside the inverter may be damaged, so check all switching devices in boost1. Finally, a detection circuit malfunction could also be the cause; in that case, check the detection circuit inside the inverter.
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Christina BurnsSep 12, 2025
What causes HW Con. Fail error on Delta RPI Inverter?
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  Michelle WoodsSep 12, 2025
  A HW Con. Fail error on your Delta Inverter can be caused by a wrong connection in the AC plug or a detection circuit malfunction. To fix this, check the AC connection, ensuring it accords with the manual, and check the detection circuit inside the inverter.
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Scott ZavalaAug 28, 2025
What causes 'Ground Current' error on Delta RPI?
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  David Powell PhDAug 28, 2025
  A 'Ground Current' error on a Delta Inverter may arise from several factors: a PV array insulation fault, so check the insulation of Solar inputs. It could also be due to large PV array capacitance between Plus to Ground or Minus to Ground, so check the capacitance (+ GND & - GND), and it must be less than 2.5uF. Install a external transformer if necessary. Additionally, either side of the boost driver or boost choke might malfunction, so check boost driver & boost choke. Finally, a detection circuit malfunction could be the cause; in that case, check the detection circuit inside the inverter.
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Raymond MorseAug 28, 2025
What to do if my Delta Inverter shows 'HW Con. Fail'?
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  alexander10Aug 28, 2025
  If your Delta Inverter displays 'HW Con. Fail', it may be due to a wrong connection in the AC plug. Check the AC connection, ensuring it accords to the manual. Alternatively, a detection circuit malfunction could be the cause, so check the detection circuit inside the inverter.
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Jennifer MontgomerySep 23, 2025
What causes AC Cur. High error on Delta RPI Inverter?
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  James HaynesSep 23, 2025
  An AC Cur. High error on your Delta Inverter can be caused by a surge during operation, a defective driver for the inverter stage, a defective switching device, or a detection circuit malfunction. To resolve this, check the driver circuit in the inverter stage, check all switching devices in the inverter stage, and check the detect circuit inside the inverter.
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Mrs. Angela DicksonSep 15, 2025
What causes HW NTC4 Fail error on Delta RPI?
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  Barbara WilliamsSep 15, 2025
  A HW NTC4 Fail error on your Delta Inverter can be caused by an ambient temperature exceeding 90 ? or dropping below -30 ?, or a detection circuit malfunction. To resolve this, check the installation ambient and environment, and check the detection circuit inside the inverter.
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Jennifer SmithSep 12, 2025
What causes HW FAN error on Delta RPI Inverter?
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  zimmermanbryceSep 12, 2025
  A HW FAN error on your Delta Inverter can be caused by one or more fans being locked, defective, or disconnected, or a detection circuit malfunction. To resolve this, remove any object stuck in the fan(s), replace any defective fan(s), check the connections of all fans, and check the detection circuit inside the inverter.
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Robert MyersSep 8, 2025
How to fix Insulation fault on Delta RPI Inverter?
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  Kim HerreraSep 8, 2025
  An insulation fault on your Delta Inverter can be caused by a PV array insulation fault, large PV array capacitance between Plus to Ground or Minus to Ground, or a detection circuit malfunction. You should check the insulation of solar inputs, check the capacitance and dry the PV panel if necessary, and check the detection circuit inside the inverter.
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Amy FergusonAug 30, 2025
What does 'HW NTC2 Fail' mean on my Delta RPI?
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  alyssa38Aug 30, 2025
  If your Delta Inverter is showing a 'HW NTC2 Fail' error, it may indicate that the ambient temperature is above 90 degrees or below -30 degrees. Check the installation ambient and environment. Another possible cause is a detection circuit malfunction, so check the detection circuit inside the inverter (RTB1).
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Sandra MoonAug 30, 2025
What does 'HW NTC3 Fail' indicate on my Delta RPI Inverter?
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  Mary HillAug 30, 2025
  A 'HW NTC3 Fail' error on your Delta Inverter may indicate that the ambient temperature is above 90 degrees or below -30 degrees. You should check the installation ambient and environment. It could also be due to a detection circuit malfunction, so check the detection circuit inside the inverter (RTG1).

Delta RPI Series Specifications

General

Efficiency	Up to 98.8% (depending on model)
Frequency	50 Hz / 60 Hz
Model	RPI Series
Type	Inverter
Protection Rating	IP65
Cooling	Natural convection
Category	Inverter
Cooling Method	Natural convection
Dimensions	Varies by model
Weight	Varies by model
Protection Features	Overvoltage, Short Circuit