Delta RPI-H5

Questions and Answers:

S
Samantha KellerAug 27, 2025
Why does my Delta RPI-H5 Inverter display 'Grid Freq. Under Rating'?
- C
  courtneyholtAug 27, 2025
  The 'Grid Freq. Under Rating' error on your Delta Inverter can be caused by the actual utility frequency being below the UFR setting, an incorrect country or grid setting, or a detection circuit malfunction. You can resolve this by checking the utility frequency at the inverter terminal. Also, verify the country and grid settings. If the issue continues, check the detection circuit inside the inverter.
M
Melissa RobertsAug 27, 2025
What causes 'Grid Freq. Over Rating' error on my Delta RPI-H5?
- J
  Jessica GilesAug 27, 2025
  The 'Grid Freq. Over Rating' error on your Delta Inverter can be triggered by a few things: the actual utility frequency exceeding the OFR setting, an incorrect country setting, or a malfunction in the detection circuit. To troubleshoot, check the utility frequency at the inverter terminal. Also, verify the country setting. If the problem persists, inspect the detection circuit inside the inverter.
T
Tammy OrtizAug 25, 2025
How to fix 'Grid Volt Over Rating' on a Delta RPI-H5 Inverter?
- L
  Leon RivasAug 26, 2025
  If your Delta Inverter is showing a 'Grid Volt Over Rating' error, it could be due to the actual utility voltage exceeding the OVR setting, the utility voltage surpassing the Slow OVR setting during operation, an incorrect country or grid setting, or a problem with the detection circuit. You should check the utility voltage at the inverter terminal. Also, verify the country and grid settings. If the issue remains, inspect the detection circuit inside the inverter.
D
davidrobinsonAug 25, 2025
Why does my Delta Inverter show 'Grid Volt Under Rating'?
- J
  Jocelyn VaughnAug 25, 2025
  The 'Grid Volt Under Rating' error on your Delta Inverter can occur due to several reasons: the actual utility voltage being below the UVR setting, the utility voltage dropping below the Slow UVR setting during operation, an incorrect country or grid setting, or a detection circuit malfunction. To address this, check the utility voltage connection to the inverter terminal. Also, verify the country and grid settings. If the problem continues, have the detection circuit inside the inverter checked.

Delta RPI-H5 Specifications

General

Brand	Delta
Model	RPI-H5
Category	Inverter
Language	English

Summary

General Information

About this Manual

Provides detailed information on specifications, installation, and settings for RPI-H3/RPI-H5 models.

Safety Symbol & Instruction

Explains safety symbols and provides essential instructions for safe operation and handling of the inverter.

Validity

Outlines the models covered by the manual and their validity for installation procedures and technical data.

Product Description

How It Works

Additional Information

Installation and Wiring

Instruction before Installation

Strongly recommends reading the manual thoroughly before installation for safety and proper procedures.

Unpacking

Illustrates the step-by-step process of unpacking the RPI-H3 and RPI-H5 inverter units.

Package Inspection

Identification Label

Product Overview

Dimensions

Provides detailed dimensional drawings and measurements for both RPI-H3 and RPI-H5 inverter models.

Function Introduction

LCD Display and Buttons

Inverter InputOutput Interface

Installation

Installation Location

Provides critical safety warnings and guidelines for selecting a suitable and safe installation location for the inverter.

Mounting

Describes the wall-mounting system, ensuring perpendicular installation, and the process of attaching the mounting plate.

Wiring

Preparation before Wiring

Covers essential pre-wiring checks, including voltage, polarity, grounding, and system wiring diagrams.

AC Grid Connection: L + N + PE

Required protective devices and cable cross-sections

DC Connection (from PV Array)

Communication Module

RS-485 Connection

Details the RS-485 pin definition and references tables for protocol settings and multi-inverter connections.

ActiveReactive Power Control and LVRT (Optional)

Active Power Control

Covers settings for active power control, including power limit and frequency-dependent power reduction.

Power Limit

Allows users to reduce inverter output power by setting a percentage of actual or rated power.

Power vs. Frequency

Explains how active power is adjusted based on grid frequency variations according to specific standards.

Reactive Power Control

Details the requirements and methods for controlling reactive power output, including fixed power factor and voltage characteristics.

Low Voltage Ride Through (LVRT)

Explains the LVRT requirements for generation systems over 6 kW to avoid disconnection during grid voltage dips.

Fixed Power Factor coso (VDE-AR-N 4105,CEI 0-21)

coso(P) (VDE-AR-N 4105,CEI 0-21)

Fixed Reactive Power In Var. (CEI 0-21)

Reactive Power Voltage Characteristic Q(U)(CEI 0-21)

Turn PV inverter onoff

Start-up Procedures

Outlines the critical steps for safely starting up the PV inverter, including voltage checks and initial setup.

PV Array DC Voltage Checking

Details how to measure the open circuit DC voltage of the PV array before inverter startup.

AC Utility Voltage Checking

Explains how to check the AC utility voltage to ensure it is within the inverter's operating range.

Starting up the Inverter

Describes the final steps for switching on the inverter and navigating the initial setup screens.

Inverter Setting

Country Setting

Guides users through the process of selecting their country for proper inverter configuration and operation.

AC Configuration Setting

Connecting the Communication Wiring

Inverter ID Setting

LCD flowchart

Event List

Country Selection

Language Selection

Insulation Mode (Only useable for RPI-H5)

Settings

Cosphi Settings (Only useable for RPI-H3)

Italy Self-test

Maintenance

Measurement, Error Message and Trouble Shooting

Measurement

Explains the various measurements displayed by the inverter, such as output, voltage, current, and energy.

Error Message & Trouble Shooting

De-Commissioning

Technical Data

Specifications

Lists detailed technical specifications for RPI-H3 and RPI-H5 models, covering general, DC input, and AC output parameters.

Appendix A Multi-function Relay

Multi-function relay output connection

Appendix B Digital Input

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