MUST PH1800 PRO 5.2KW 48V Hybrid Solar Inverter User Manual

1. Introduction

The MUST PH1800 PRO is a multi-function inverter/charger designed to provide uninterruptible power support. It integrates the functions of an inverter, an 80A/100A MPPT solar charger, and a 60A/80A AC battery charger. This series is capable of operating without a battery, offering flexibility in various power setups. It features a maximum PV array open circuit voltage of 450V and an MPPT voltage range of 150-430Vdc, optimizing solar energy utilization.

2. Important Safety Instructions

WARNING: Failure to follow these instructions may result in serious injury or damage to the inverter.

• Read all instructions and cautionary markings on the unit and in this manual before installation and operation.
• Installation must be performed by qualified personnel in accordance with all local electrical codes.
• Ensure all connections are correct and secure before powering on the unit. Incorrect wiring can cause product damage or fire.
• Do not disassemble the inverter. There are no user-serviceable parts inside.
• Keep the inverter away from flammable materials, moisture, and direct sunlight.
• Ensure adequate ventilation around the inverter to prevent overheating.
• Always disconnect all power sources (PV, AC, Battery) before performing any maintenance or wiring.

3. Key Features

• Pure sine wave output for sensitive electronics.
• Smart LCD settings for customizable working modes, charge current, and charge voltage.
• Built-in MPPT 80A/100A solar charge controller and 60A/80A AC charge controller.
• Maximum PV Array Open Circuit Voltage of 450V.
• Ability to provide power to the load without a battery.
• Combines solar system, AC utility, and battery power sources for continuous power supply.
• Comprehensive protection against overload, short circuit, and deep discharge.
• Cold start function.
• Supports USB and RS485 monitoring functions.
• Compatible with various battery types including LiFePo4, Gel, and Lead Acid.
• Optional mobile phone APP for remote monitoring.
• Capable of feeding energy back to the grid (ON-OFF-GRID functionality).
• WIFI and Parallel kit support for expanded system capabilities.
• Output Source Priority Selection: SUB (Solar-Utility-Battery), SBU (Solar-Battery-Utility), SOL (Solar Only), UTI (Utility Only).

4. Product Overview

4.1. Physical Dimensions

The inverter measures 295mm (W) x 528mm (H) x 121mm (D).

Figure 4.1: Inverter dimensions and a list of applicable appliances.

4.2. Front and Rear Panel Details

Figure 4.2: Detailed diagram illustrating the LCD display, status indicators, function buttons, fault indicator, charging indicator, and various communication and power ports on the inverter.

Front Panel:

• LCD Display: Shows system status and settings.
• Status Indicator: Indicates operational status.
• Function Buttons: For navigation and setting adjustments.
• Fault Indicator: Alerts to system errors.
• Charging Indicator: Shows battery charging status.

Rear Panel Ports:

• RS485 Communication Port: For external communication.
• USB Port: For PC monitoring and data transfer.
• Dry Contact: For external control signals.
• Parallel Switch: For enabling parallel operation with multiple inverters.
• Parallel Communication Port: For communication between parallel units.
• USB WIFI: For connecting the optional Wi-Fi module.
• Circuit Breaker: Overcurrent protection.
• AC Input: Connection for grid or generator AC power.
• AC Output: Connection for loads.
• Battery Input: Connection for battery bank.
• PV Input: Connection for solar panels.
• Power On/Off Switch: Main power control.

5. Setup and Installation

Proper installation is critical for the safe and efficient operation of your inverter. Please follow these guidelines carefully.

5.1. Mounting the Inverter

• Choose a dry, well-ventilated area, away from direct sunlight and heat sources.
• Ensure the mounting surface is strong enough to support the inverter's weight (14.5KG).
• Allow sufficient clearance around the inverter for proper airflow and cooling.

5.2. Wiring Connections

All wiring should be done by a qualified electrician. Ensure all power sources are disconnected before making any connections.

5.2.1. Solar Panel Connection

Refer to the table below for recommended solar panel configurations based on your desired total solar input power. The inverter supports a maximum PV array open circuit voltage of 450V and an MPPT voltage range of 150-430VDC.

Figure 5.1: Diagram illustrating the connection of solar panels to the inverter's PV input.

5.2.2. Battery, AC Input, and AC Output Connections

Connect your battery bank to the Battery Input terminals, ensuring correct polarity. Connect the AC utility or generator to the AC Input terminal. Connect your loads to the AC Output terminal. Ensure all cables are properly sized for the current they will carry.

Figure 5.2: Wiring diagram for operating the inverter with solar panels, AC input, AC output, generator, and loads, including a configuration for running without a battery.

5.3. Wi-Fi Plug Installation (Optional)

If you have the optional Wi-Fi Plug, follow these steps for installation and setup:

Figure 5.3: Detailed quick installation guide for the Wi-Fi Plug 14, including physical installation, wireless router connection, network settings, account creation, and datalogger addition.

1. Installation: Align the USB interface of the Wi-Fi Plug with the inverter and plug it in tightly. Confirm the status of the LED indicator (When you see the orange LED light, turn on the plug. If not, check the normal working status).
2. Wireless Router Connection:
   1. Download APP: Scan the QR Code for iOS or Android from the guideline to download the SmartClient APP.
   2. Open the APP: Tap the 'Wi-Fi Config' button to enter the page.
3. Connect Wi-Fi Datalogger: Tap the 'Connect Wi-Fi Datalogger' button on the 'Wi-Fi Config' page. (Android phone has no need of this step). Select the Wi-Fi network of the Wi-Fi Plug and connect (Initial Password: 12345678).
4. Network Setting: After the connection completes, tap the 'Network Setting' button. According to the prompts, type in the information to finish the network setting. Reconnect the Wi-Fi or Cellular Data which can surf the internet (detailed on step 2.2).
5. Create Account and Plant:
   1. Create Account: Open the APP, tap the 'Register' button. According to the prompts, type in the information to create an account.
   2. Create Plant: Login to your account and click the 'Add' button on the bottom of the home page. Tap the '+' button on the top right corner of the list page. According to the prompts, type in the information to finish creating the plant.
6. Add Multiple Dataloggers: One account can create multiple plants and one plant can add multiple dataloggers. If you only have one datalogger, you can ignore this step. Tap the new plant you just created, and enter its home page. Tap the 'Devices' button on the bottom of the home page. Tap the '+' button at the top-right corner to add the datalogger. Scan the datalogger PN on the Wi-Fi Plug, or add it manually.

6. Operating Instructions

6.1. Initial Power-Up

1. Ensure all wiring connections are secure and correct.
2. Turn on the battery breaker (if applicable).
3. Turn on the PV array breaker (if applicable).
4. Turn on the AC input breaker (if applicable).
5. Switch the inverter's main power button to 'ON'.
6. Observe the LCD display for startup sequence and status.

6.2. LCD Display and Settings

The smart LCD allows you to configure various operating parameters such as working modes, charge current, and charge voltage. Refer to the detailed product diagram (Figure 4.2) for button locations.

6.3. Monitoring System (PC & Mobile App)

The inverter supports monitoring via PC software and a mobile application, allowing you to check system status and data remotely.

Figure 6.1: Overview of the PC monitoring interface, displaying device information, charger messages, and inverter messages.

Figure 6.2: PC monitoring interface showing detailed charger messages and device information.

Figure 6.3: PC monitoring interface for inverter control, allowing adjustment of various parameters like output voltage, frequency, and battery settings.

To use PC monitoring, download the upper-computer software and connect the inverter via the provided communication cable. For mobile app monitoring, follow the Wi-Fi Plug installation guide (Section 5.3) and download the SmartClient APP. The app allows you to check your inverter's status and data anywhere, anytime.

Figure 6.4: Mobile application interface showing a diagrammatic view of the solar power system.

Figure 6.5: Mobile application interface displaying detailed data and historical performance of the inverter.

7. Maintenance

• Regular Cleaning: Keep the inverter's exterior clean and free from dust and debris. Use a dry cloth for cleaning.
• Ventilation Check: Ensure that the ventilation openings are not blocked to maintain proper cooling.
• Connection Inspection: Periodically check all wiring connections for tightness and signs of corrosion or damage.
• Battery Health: If using batteries, monitor their health and charge status as recommended by the battery manufacturer.
• Software Updates: Check for available software/firmware updates for the inverter and monitoring applications to ensure optimal performance and security.

8. Troubleshooting

If the inverter is not functioning as expected, perform the following basic checks before contacting support:

• No Power/Display: Check all power connections (battery, AC input, PV input) and ensure the main power switch is ON. Verify input voltages are within specifications.
• No AC Output: Check AC output connections and ensure loads are not exceeding the inverter's rated power. Verify the inverter is not in a fault state (check fault indicator on LCD).
• Charging Issues: Ensure solar panels are receiving adequate sunlight and are connected correctly. Check battery voltage and health. Verify charge settings on the LCD or monitoring software.
• Overload/Short Circuit: If an overload or short circuit fault occurs, disconnect the load, clear the fault, and restart the inverter. Reduce the load or check for short circuits in the wiring.
• Communication Issues (PC/App): Ensure the Wi-Fi Plug is correctly installed and connected to your network. Verify USB/RS485 cable connections for PC monitoring.

Important: Incorrect operation, especially during wiring, can cause severe damage. Always refer to the manual and ensure proper installation.

9. Specifications

9.1. Product Parameters

9.2. SKU Explanation

10. User Tips

• Verify AC Output Voltage: The inverter's AC output voltage is configurable (e.g., 230VAC±5%). Always verify and set the AC output voltage to match your specific load requirements (e.g., 110V or 220V) to ensure compatibility and prevent damage to appliances.
• Optimize Solar Panel Configuration: Utilize the provided solar panel connection guidelines to maximize your solar input power based on your panel specifications.
• Leverage Monitoring Features: Regularly use the PC software or mobile app to monitor your inverter's performance, battery status, and energy production. This helps in optimizing your system and identifying potential issues early.

11. Warranty & Support

11.1. Warranty Policy

The MUST PH1800 PRO inverter comes with a one-year warranty, effective from the date you receive the goods. Within this period, for damages not caused by human factors, engineers will provide free diagnosis to determine the problem and offer repair solutions. Free accessories will be provided within the warranty period.

11.2. After-Sales Support

For any other problems or technical assistance, you can contact MUST's support team directly. Engineers are available 24 hours online to provide service.

• Engineer Phone: +86 17788797642 (WeChat and WhatsApp available)
• E-mail: cs-zjs@mustpower.cn

Please note: Incorrect operation, such as not following standard installation procedures when connecting cables, may cause the product to burn out and could void the warranty. Always read the manual carefully during installation.