Solis 4G Three-Phase Inverter Installation and Operation Manual

1. Introduction

The Solis 4G three-phase inverters integrate DRM and backflow power control function, which could be suitable for the requirements of the smart grid.

This is the manual for the following three-phase inverter models:

• Solis-3P12K-4G
• Solis-3P15K-4G
• Solis-3P17K-4G
• Solis-3P20K-4G
• Solis-3P10K-4G-LV

1.1 Product Description

The front view of the inverter shows:

• 4 buttons
• DC switch (optional)
• DC input
• LED lights
• LCD display

The bottom view of the inverter shows:

• RS485
• CT/Meter
• AC output
• DRM (For UK and Belgium)

1.2 Packaging

When you receive the inverter, please ensure all the following parts are included:

• Inverter x1
• Mounting bracket x1
• Fixing screw x2
• RJ45 connector x1
• DC connector (4)
• AC connector x1
• WiFi/GPRS Stick x1 (Optional)
• User Manual x1

If any part is missing, please contact your local Solis dealer.

2. Safety Instructions

2.1 Safety Symbols

The safety symbols used in this manual highlight potential safety risks and important safety information:

• WARNING: Indicates important safety instructions that, if not followed correctly, could cause serious injury or death.
• NOTE: Indicates important safety instructions that, if not followed correctly, could cause damage or destruction of the inverter.
• CAUTION: Indicates important safety instructions that, if not followed correctly, could cause electric shock.
• CAUTION: HOT SURFACE: Indicates safety instructions that, if not followed correctly, could cause burns.

2.2 General Safety Instructions

• Do not connect the positive (+) or negative (-) photovoltaic field to ground; it could cause serious damage to the inverter.
• Electrical installations must be carried out in accordance with local and national electrical safety regulations.
• To reduce the risk of fire, overcurrent protection devices (OCPD) are required for circuits connected to the inverter. The DC OCPD shall be installed according to local requirements. All output circuit and photovoltaic source conductors must have disconnectors that comply with Article 690, Part II of the NEC. All Solis three-phase inverters have a built-in DC switch.
• Risk of electric shock. Do not remove the cover. There are no user-serviceable parts inside the device. Refer servicing to qualified and certified service technicians.

2.3 Notice of Use

The inverter has been built according to applicable technical and safety guidelines. Use the inverter ONLY in installations that comply with the following specifications:

1. Permanent installation is required.
2. Electrical installation must comply with all applicable regulations and standards.
3. The inverter must be installed according to the instructions provided in this manual.
4. The inverter must be installed according to the correct technical specifications.
5. To start up the inverter, the main AC supply switch must be turned ON before the solar panel DC isolator is turned ON. To stop the inverter, the main AC supply switch must be turned OFF before the solar panel DC isolator is turned OFF.

3. General Overview

3.1 Front Panel Display

The front panel display shows:

• POWER
• OPERATION
• ALARM
• ESC, UP, DOWN, ENTER buttons
• 4G Series

3.2 Status Indicator LED Lights

3.3 Keypad

There are four keys on the front panel: ESC, UP, DOWN, and ENTER. The keypad is used to navigate options and adjust settings.

3.4 LCD

The two-line Liquid Crystal Display (LCD) on the front panel shows:

• Inverter operating status and data.
• Service messages for the operator.
• Alarm messages and fault indications.

4. Handling and Storage of Products

4.1 Product Handling

Follow these instructions for handling the inverter:

1. The red circles indicate cutouts in the product packaging. Push the cutouts to form handles to move the inverter.
2. Open the box. Two people should grip both sides of the inverter through the indicated area to move it.

4.2 Product Storage

If the inverter is not installed immediately, observe the following storage instructions and environmental conditions:

• Use the original packaging, seal with adhesive tape, and include the desiccant.
• Store the inverter in a clean, dry, dust-free, and dirt-free location.
• Storage temperature should be between -40°C and 70°C, and humidity between 0% and 100% (non-condensing).
• Do not stack more than three (3) inverters vertically.
• Keep the packaging away from corrosive materials to prevent damage to the inverter casing.
• Periodically inspect the packaging. If damaged, return the inverter in its original packaging immediately.
• Store the inverter(s) on a flat, hard surface, not tilted or upside down.
• After prolonged storage, the inverter must be examined and tested by qualified service personnel before use.
• To restart the equipment after a long period of inactivity, it may be necessary to inspect it and, in some cases, remove rust and dust that may have accumulated inside the equipment.

5. Installation

5.1 Selecting an Inverter Location

Consider the following criteria when selecting an inverter location:

• WARNING: Fire Hazard
• Do not install the inverter in areas with highly flammable materials or gases.
• Do not install the inverter in potentially explosive atmospheres.
• Do not install in small, enclosed spaces where airflow is restricted. Ensure adequate airflow around the inverter to prevent overheating.
• Exposure to direct sunlight can increase the inverter's operating temperature and may lead to output power limitation. Ginlong recommends installing the inverter to avoid direct sunlight or rain.
• Consider the ambient air temperature when choosing the installation location to prevent overheating. Ginlong recommends using a sunshade to minimize direct sunlight when the ambient temperature exceeds 40°C (104°F).
• Ensure visibility of the LED indicator lights and the LCD display.
• Install vertically (+/- 5°) or tilted backward (<= 15°).
• Do not mount the inverter tilted forward.
• Do not mount the inverter horizontally.

Ensure adequate clearance around the inverter for mounting:

• Top: 500mm
• Bottom: 500mm
• Left/Right: 500mm
• Rear: 1000mm

Important Notes:

• The inverter's heatsink temperature can reach 75°C (167°F).
• The inverter is designed for extreme environments. Operating temperature range: -25°C to 65°C.
• When installing multiple inverters, maintain a minimum clearance of 30 cm between each inverter or object. The bottom of the inverter should be at least 500 mm from the ground.

5.2 Mounting the Inverter

Follow these steps to mount the inverter vertically:

1. Refer to the mounting bracket dimensions.
2. Ensure the mounting bracket is level. Mark the mounting holes on the wall. Drill the holes and insert expansion bolts.
3. Use appropriate expansion screws to fix the bracket to the wall.
4. Lift the inverter onto the bracket and secure it with locking screws.

5.3 Electrical Connections

The inverter features a quick-connect terminal, so the top cover does not need to be opened for electrical connections. Relevant signals are located at the bottom of the inverter.

Electrical Connection Steps:

1. Disconnect the main AC power switch.
2. Disconnect the DC isolator.
3. Mount the photovoltaic input connector to the inverter.

5.3.1 Ground Connection

Two grounding methods are required for effective inverter protection:

• Connect the AC grounding cable.
• Connect the external ground terminal.

To connect the ground terminal to the heatsink:

1. Prepare the ground wire (≥6 mm² recommended).
2. Prepare OT terminals (M6).
3. Strip the insulation to the appropriate length (see Figure 5.8).
4. Insert the stripped wire into the OT terminal's crimping area and crimp using a hydraulic crimper (see Figure 5.9).
5. Remove the heatsink ground screw.
6. Connect the ground wire to the heatsink ground connection point and tighten the ground screw (3-4 Nm torque).
7. For improved anti-corrosion performance, apply silicone or paint after installing the ground wire for added protection.

Important: For parallel inverters, all inverters must be connected to the same ground point to eliminate potential voltage differences.

5.3.2 Connecting the Inverter's Photovoltaic Side

Before connecting the inverter:

• Ensure the open-circuit voltage of the photovoltaic array is within the inverter's limit.
• Ensure the polarity of the photovoltaic array output voltage matches the "DC+" and "DC-" symbols.

PV Cable Requirements:

• Generic PV cable (model: PV1-F)
• Cross-section: 4.0~6.0 mm² (Recommended: 4.0, 12 AWG)

PV Connector Assembly Steps:

1. Strip the DC cable to approximately 7 mm and remove the connector's cap nut.
2. Insert the cable into the connector's cap nut and contact pin.
3. Crimp the contact pin to the cable using an appropriate cable crimper.
4. Insert the metal connector into the top of the connector and tighten the cap nut (2.5-3 Nm torque).

Important: Measure the photovoltaic DC input voltage with a multimeter, verify cable polarity, and ensure each photovoltaic string voltage is within the inverter's operating range. Connect the DC connector to the inverter until a slight click is heard.

Caution: If DC inputs are accidentally reversed, or if the inverter is defective, do not turn off the DC switch as this could damage the inverter or cause a fire. Correct actions involve using a clamp meter to measure DC string current. If it exceeds 0.5A, wait for solar radiation to decrease until the current drops below 0.5A. Only then can you turn off the DC switches and disconnect the PV strings. Damage due to incorrect operation is not covered by the warranty.

5.3.3 Connecting the Inverter's Grid Side

For all AC connections, use YJV-0.6/1KV 6-16 mm² cable. Ensure cable resistance is less than 1.5 ohms. If the cable length exceeds 20 m, use a 10-16 mm² cable.

The five internal connection ports of the AC connector are labeled "L1", "L2", "L3", "N", and "PE". Connect the three live wires to L1, L2, and L3 respectively. The ground wire connects to PE, and the neutral wire connects to N.

AC Terminal Connector Installation Steps:

1. Strip the cable insulation to about 70 mm, exposing 9 mm of the copper core. Pass the cable through the nut and plug element sleeve. Insert the corresponding terminals and tighten with an Allen wrench (1.8-2.0 Nm torque).
2. Attach the plastic accessory (auxiliary fitting) to the plug element, tighten the adapter to the plug element, and then tighten the rotating nut (3-4 Nm torque).
3. Connect the AC connector to the inverter and tighten it clockwise until a slight click is heard.

5.3.4 Maximum Overload Protection Device (OCPD)

To protect the inverter's AC connection conductors, Solis recommends installing circuit breakers for overload protection. The following table lists the OCPD ratings for Solis 12-20 kW three-phase inverters:

5.3.5 Inverter Monitoring Connection

The inverter can be monitored via Wi-Fi or GPRS. Solis communication devices are optional. Refer to the Solis communication device installation manuals for connection instructions.

5.3.6 Meter Connection (Optional)

The inverter can operate with a three-phase smart meter for export energy management and/or 24-hour consumption monitoring.

Note:

• For Export Energy Management, the smart meter can be installed on the grid side or load side.
• For 24-hour Consumption Monitoring, the smart meter must be installed on the grid side.

Supported meter types include direct-insertion meters (max 80A) and external CT meters (150A/5A CTs). Contact Solis sales representatives for ordering information. Refer to Section 7.5.12 for detailed connection diagrams.

5.3.7 Logic Interface Connection (for UK and Belgium)

The logic interface is required by local regulations in the UK and Belgium and can be operated by a simple switch or contactor. When the switch is closed, the inverter operates normally. When the switch is open, the inverter reduces its output power to zero within 5 seconds. Pins 5 and 6 of the RJ45 terminal are used for the logic interface connection.

RJ45 Connector Assembly:

1. Insert the network cable into the RJ45 communication terminal.
2. Strip the communication cable insulation according to the standard line sequence (Figure 5.31) and connect the cable to the RJ45 plug. Use a network cable crimping tool to secure it.
3. Connect RJ45 to DRM (logic interface).

Refer to Chapter 7.5.8.1 for instructions on enabling the logic interface function after cable connection.

6. Startup and Shutdown

6.1 Starting the Inverter

Follow these steps to start the inverter:

1. Turn ON the main AC supply switch.
2. Turn ON the DC switch. If the photovoltaic array voltage is higher than the startup voltage, the inverter will turn on, and the red power LED will illuminate.
3. When both DC and AC sides supply the inverter, it is ready to generate power. The inverter will check its internal parameters and grid parameters to ensure they are within acceptable limits. The green LED will flash, and the LCD will display "INITIALIZING".
4. After 30-300 seconds (depending on local requirements), the inverter will start generating power. The green LED will be continuously ON, and the LCD will display "GENERATING".

CAUTION: Do not touch the inverter surface when it is operating, as it may be hot and cause burns.

6.2 Shutting Down the Inverter

Follow these steps to shut down the inverter:

1. Turn OFF the AC switch.
2. Turn the DC switch to the "OFF" position.
3. Remove the positive and negative DC lines and the AC lines.

7. Operation

7.1 Main Menu

The main menu has four submenus:

1. Information
2. Settings
3. Advanced Information
4. Advanced Settings

7.2 Information

The Solis 4G Three-Phase Inverter main menu provides access to operational information and data. Navigate through the "Information" menu by pressing UP/DOWN keys.

The LCD display shows inverter power and operating status. Pressing the INTRO key accesses the main menu.

7.2.1 Lock Screen

Pressing the ESC key returns to the Main Menu. Pressing the INTRO key locks (Figure 7.2[a]) or unlocks (Figure 7.2[b]) the screen.

7.3 Settings

The following submenus are displayed when "Settings" is selected:

• 7.3.1 Set Time
• 7.3.2 Set Address

7.3.1 Set Time

This function allows adjusting the time and date. Press UP/DOWN to adjust values and INTRO to move between digits. Press ESC to save settings and return to the previous menu.

7.3.2 Set Address

This function sets the address when connecting multiple inverters to three monitors. The address number can be assigned from "01" to "99". The default address for the Solis 4G three-phase inverter is "01". Press UP/DOWN to adjust the address and INTRO to save. Press ESC to cancel changes.

7.4 Advanced Information (Technicians Only)

NOTE: Access to this area is restricted to fully qualified and accredited technicians. Enter the "Advanced Information" and "Advanced Settings" menus (requires a password).

The password prompt requires entering the correct password (default: 0000).

• 7.4.1 Alarm Message
• 7.4.2 Operation Message
• 7.4.3 Version
• 7.4.4 Daily Energy
• 7.4.5 Monthly Energy
• 7.4.6 Yearly Energy
• 7.4.7 Daily Log
• 7.4.8 Communication Data
• 7.4.9 Alert Message

7.4.1 Alarm Message

Displays the 100 most recent alarm messages. Navigate using UP/DOWN keys. Press ESC to return to the previous menu.

7.4.2 Operation Message

Displays operational messages such as internal temperature, standard No. 1, 2, etc. Navigate using UP/DOWN keys.

7.4.3 Version

Displays the model version and software version of the inverter.

7.4.4 Daily Energy

Check daily energy generation for a selected date. Use UP/DOWN to move the cursor and ARRIBA to change digits. Press INTRO to confirm the date.

7.4.5 Monthly Energy

Check monthly energy generation for a selected month. Use UP/DOWN to move the cursor and ARRIBA to change digits. Press INTRO to confirm the date.

7.4.6 Yearly Energy

Check yearly energy generation for a selected year. Use UP/DOWN to move the cursor and ARRIBA to change digits. Press INTRO to confirm the date.

7.4.7 Daily Log

Displays adjustment history. For maintenance personnel only.

7.4.8 Communication Data

Displays internal inverter data. For service technicians only.

7.4.9 Alert Message

Displays the 100 most recent warning messages. Navigate using UP/DOWN keys. Press ESC to return to the previous menu.

7.5 Advanced Settings (Technicians Only)

NOTE: Access to this area is restricted to fully qualified and accredited technicians. Refer to 7.4 for password entry.

Select "Advanced Settings" from the main menu to access the following options:

1. Select Standard
2. Grid ON/OFF
3. 24h Switch
4. Clear Energy
5. Reset Password
6. Power Control
7. Calibrate Energy
8. Special Settings
9. STD. Mode Settings
10. Restore Configuration
11. HMI Update
12. Set Internal EPM
13. Set External EPM
14. Debug Parameter
15. DSP Update
16. Compensation Adjustment

7.5.1 Select Standard

Select the grid reference standard (e.g., G59/3, UL-480V, VDE0126, AS4777-15, AS4777-02, CQC380A, ENEL, UL-380V, MEX-CFE, C10/11, and "User-Def"). Press INTRO to confirm.

NOTE: The "User-Def" function is for service technicians only and requires authorization from the local power provider.

NOTE: For different countries, the grid standard must be set differently according to local requirements. Consult Solis service technicians for details.

7.5.2 Grid ON/OFF

This function is used to start or stop the Solis three-phase inverter's power generation.

7.5.3 24h Switch

This function controls the activation or deactivation of the 24-hour consumption function.

NOTE: When enabled, the inverter's LCD screen remains active at night with the LED light on. If the grid fails at night, the system may not recover even after the grid returns to normal, but consumption data will still be recorded by the meter. Until sunrise, the system will start operating again, and meter data can be uploaded to the Solis monitoring system for load consumption data calibration.

7.5.4 Clear Energy

Clearing energy allows resetting the inverter's historical performance.

Note: These two functions are applicable only to maintenance personnel. Incorrect operation will prevent the inverter from functioning correctly.

7.5.5 Reset Password

This function is used to set a new password for the "Advanced Information" and "Advanced Settings" menus.

7.5.6 Power Control

Active and reactive power can be configured using the adjustment button. This submenu has five items: 1. Configure output power, 2. Adjust reactive power, 3. Out_P with restoration, 4. Rea P with restoration, 5. Select PF curve.

Note: This function is applicable only to maintenance personnel. Incorrect operation will prevent the inverter from reaching maximum power.

7.5.7 Calibrate Energy

Maintenance or replacement may cause the total energy value to change. This function allows the user to correct the total energy value to match the previous value. If the monitoring website is used, data will be synchronized with this setting automatically.

7.5.8 Special Settings

This function is applicable only to maintenance personnel. Incorrect operation will prevent the inverter from reaching maximum power.

7.5.9 STD Mode Settings

There are 5 settings in STD. Mode configuration: 1. Operating mode, 2. Power rate limit, 3. Frequency derating setting, 4.10 min Set OV-G-V., 5. Initial parameters.

Note: This function is applicable only to maintenance personnel. Incorrect operation will prevent the inverter from reaching maximum power.

7.5.9.1 Enable Logic Interface Configuration

When selecting the G98 or G99 standard for the logic interface function, follow the configurations below to enable DRM. The default DRM setting is "OFF". If DRM is "ON" but the logic interface is not connected to the switch or the switch is open, the inverter's HMI will display "DRM Limit" and the inverter's output power will be limited to zero.

1. Select Initial Configuration
2. Select DRM and set it to "ON".

7.5.10 Restore Settings

This submenu has five items for initial settings. Restore settings allow setting all items in the special settings (7.5.8) to default.

Press INTRO to save the configuration after turning off the grid. Press ESC to return to the previous menu.

7.5.11 HMI Update

This function is used to update the LCD program.

Note: This function is applicable only to maintenance personnel. Incorrect operation will prevent the inverter from reaching maximum power.

7.5.12 Set Internal EPM

NOTE: This section includes two functions related to the smart meter or smart sensor. Refer to Section 5.3.6 for detailed connection diagrams.

Function 1: Internal Export Power Management Function

Inverters can work with a smart meter to dynamically limit the system's export power, achieving zero injection. The smart meter can be installed on the grid side or load side.

Function 2: 24-Hour Consumption Control Function

Only applicable if using the Solis monitoring system. Inverters can work with a smart meter to monitor load consumption data throughout the day, and the data will be displayed in the Solis monitoring system. The smart meter can only be installed on the grid side.

NOTE: Follow the instructions below for different usage scenarios.

• Scenario 1: Only Function 1 is required
1. Refer to Section 5.3.6 to connect the smart meter on the grid or load side.
2. Select Section 7.5.12.1 "Mode Selection" as Option 2 (Meter on Load) or Option 3 (Meter on Grid).
3. Configure Section 7.5.12.2 to set the allowed backflow power.
4. Configure Section 7.5.12.3 to enable the safety function (if required).
5. Configure Section 7.5.12.4 to modify the operating mode (if necessary).
• Scenario 2: Both Functions 1 and 2 are required
1. Refer to Section 5.3.6 to connect the smart meter on the grid side.
2. Select Section 7.5.12.1 "Mode Selection" as Option 3 (Meter on Grid).
3. Select the "24h Switch" in Section 7.5.3 as "Enable".
4. Configure Section 7.5.12.2 to set the allowed backflow power.
5. Configure Section 7.5.12.3 to enable the safety function (if required).
6. Configure the Solis monitoring system (refer to the monitoring device manual).

If the customer does not wish to enable the export power control function, set the "backflow power" to the inverter's maximum output power in step 4 or select the mode as "consumption monitoring" in step 2 and skip steps 4-5.

7.5.12.1 Mode Selection

There are 4 settings in this menu:

1. OFF: Functions are disabled.
2. Meter on Load: Solis smart meter is connected to the load branch circuit.
3. Meter on Grid: Solis smart meter is connected to the grid connection point (backflow power is set to 0 W by default).
4. Consumption Monitoring: Solis smart meter is connected to the grid connection point (backflow power setting is not applicable).

7.5.12.2 Backflow Power

This setting is used to define the allowed export power to the grid. The adjustment range is between 00000 W and 29900 W.

7.5.12.3 Backup ON/OFF

This setting is used to issue an alarm (also stop the inverter's generation) when the meter connection is lost during operation. It can prevent possible energy backflow to the grid when the system loses control.

7.5.12.4 Backflow Operation Mode

This submenu is used to configure the backflow operation mode: 01, 02. "01" is the default mode.

Mode "01" (Average Limiting): The output power of each phase is the average of the three-phase load power, and it is more than the lowest power phase among the three phases.

Mode "02" (Per Phase Limiting): The inverter only generates power equivalent to the three-phase load power, which is the lowest load power of a specific phase.

7.5.13 External EPM Adjustment

This configuration should only be activated when using a Solis external EPM device. There are two available options: 5G-EPM and Other-EPM.

The 5G-EPM fail-safe option must be activated when using a 5-series external EPM device. The Other EPM safety option must be activated when using a 2G series external EPM device.

7.5.14 HMI Reset

This function is used to reset the HMI.

7.5.15 Debug Parameter

This function is used only by manufacturer maintenance personnel.

7.5.16 DSP Update

This function is used to update the DSP.

Note: This function is applicable only to maintenance personnel. Incorrect operation will prevent the inverter from reaching maximum power.

7.5.17 Compensation Adjustment

Note: This function is applicable only to maintenance personnel. Incorrect operation will prevent the inverter from reaching maximum power.

7.6 AFCI Function

Solis inverters have a built-in AFCI function that can detect a DC circuit arc fault and shut down the inverter to prevent fire.

7.6.1 Enable AFCI Function

The AFCI function can be enabled as follows: Path: Advanced Settings -> Password: 0010 -> Special Configuration -> AFCI Configuration -> AFCI ON/OFF -> ENABLED.

Warning: The "AFCI Level" is reserved for Solis technicians ONLY. Do not change the sensitivity; otherwise, false alarms or frequent malfunctions may occur. Solis is not responsible for any additional damage caused by unauthorized modifications.

7.6.2 Arc Fault

During normal operation, if a DC arc is detected, the inverter will shut down and display the following alarm:

ARC FAULT

The installer must thoroughly inspect the DC circuit to ensure all cables are properly secured.

Once the DC circuit problem is resolved or confirmed to be okay, press for 3 seconds and wait for the inverter to restart.

8. Maintenance

The Solis three-phase inverter does not require periodic maintenance. However, cleaning dust from the heatsink will help the inverter dissipate heat and increase its lifespan. Dust can be removed with a soft brush.

PRECAUTION: Do not touch the inverter surface when it is operating. Some parts of the inverter may be hot and cause burns. Shut down the inverter (see Section 6.2) and wait for a cooling-off period before performing any maintenance or cleaning operations.

The LCD screen and status indicator LED lights can be cleaned with a damp cloth if they are too dirty to read.

NOTE: Never use solvents, abrasives, or corrosive materials to clean the inverter.

8.1 Fan Maintenance

If the fan does not function correctly, the inverter will not cool effectively, which may affect the inverter's effective operation. Therefore, a broken fan needs to be cleaned or replaced as follows:

1. Disconnect the AC power.
2. Turn the DC switch to the "OFF" position.
3. Wait at least 10 minutes.
4. Disconnect all electrical connections.
5. Place the inverter on the platform.
6. Slowly remove the four screws from the fan plate and extract the fan assembly.
7. Carefully disconnect the fan connector and remove the fan.
8. Clean or replace the fan. Reassemble the fan into the frame.
9. Connect the electrical cable and reinstall the fan assembly. Restart the inverter.

9. Troubleshooting

The inverter is designed according to the most important international standards related to the grid and electromagnetic compatibility requirements. Before delivery to the customer, the inverter has undergone various tests to ensure its optimal performance and reliability.

In case of failure, the LCD will display an alarm message. The inverter may stop feeding power to the grid.

NOTE: If the inverter displays any alarm message as listed in Table 9.1, turn off the inverter (see Section 6.2) and wait 5 minutes before restarting (see Section 6.1). If the fault persists, contact your local distributor or service center. Have the following information ready before contacting us:

1. Solis three-phase inverter serial number.
2. Solis three-phase inverter distributor or reseller (if available).
3. Installation date.
4. Problem description (e.g., alarm message displayed on the LCD and status indicator LED status. Any readings obtained from the Information submenu (see Section 6.2) would also be helpful).
5. Photovoltaic array configuration (e.g., number of panels, panel capacity, number of strings, etc.).
6. Your contact details.

10. Specifications