SANDISOLAR 4.2KW 24V Solar Inverter User Manual

About This Manual

This manual describes the assembly, installation, operation, and troubleshooting of the SANDISOLAR 4.2KW 24V Solar Inverter. Please read this manual carefully before installation and operation. Keep this manual for future reference.

Purpose

This manual provides comprehensive guidance for the safe and efficient use of your solar inverter.

Scope

This manual covers safety instructions, installation guidelines, and information on tools and wiring required for the inverter.

Safety Instructions

1. Before using the unit, read all instructions and cautionary markings on the unit, the batteries, and all appropriate sections of this manual.
2. CAUTION – To reduce risk of injury, charge only deep-cycle lead acid type rechargeable batteries. Other types of batteries may burst, causing personal injury and damage.
3. Do not disassemble the unit. Take it to a qualified service center when service or repair is required. Incorrect re-assembly may result in a risk of electric shock or fire.
4. To reduce risk of electric shock, disconnect all wirings before attempting any maintenance or cleaning. Turning off the unit will not reduce this risk.
5. CAUTION – Only qualified personnel can install this device with battery.
6. NEVER charge a frozen battery.
7. For optimum operation of this inverter/charger, please follow required specifications to select appropriate cable size. It's very important to correctly operate this inverter/charger.
8. Be very cautious when working with metal tools on or around batteries. A potential risk exists to drop a tool to spark or short circuit batteries or other electrical parts and could cause an explosion.
9. Please strictly follow installation procedure when you want to disconnect AC or DC terminals. Please refer to the INSTALLATION section of this manual for the details.
10. Fuse is provided as over-current protection for the battery supply.
11. GROUNDING INSTRUCTIONS - This inverter/charger should be connected to a permanent grounded wiring system. Be sure to comply with local requirements and regulations to install this inverter.
12. NEVER cause AC output and DC input short circuited. Do NOT connect to the mains when DC input short circuits.
13. Warning!! Only qualified service persons are able to service this device. If errors still persist after following troubleshooting table, please send this inverter/charger back to local dealer or service center for maintenance.

Product Overview

Setup and Installation

Unpacking and Inspection

Before installation, please inspect the unit. Ensure that nothing inside the package is damaged. The package should contain:

• The inverter unit x 1
• User manual x 1
• PV connector x 2
• WiFi antenna x 1

Preparation

Before connecting any wirings, remove the bottom cover by unscrewing the two or three screws as shown in the diagram.

Mounting the Unit

Consider the following points before selecting where to install the inverter:

• Do not mount the inverter on flammable construction materials.
• Mount on a solid surface.
• Install this inverter at eye level to allow the LCD display to be read at all times.
• The ambient temperature should be between 0°C and 55°C to ensure optimal operation.
• The recommended installation position is to be adhered to the wall vertically.
• Ensure sufficient clearance (20 cm to the sides, 50 cm above and below) for proper air circulation and heat dissipation, and enough space for removing wires.

Battery Connection

Recommended battery cable and terminal size:

Steps to implement battery connection:

1. Make positive and negative cables based on recommended terminal size.
2. Connect all battery packs as units require. It's suggested to use recommended battery capacity.
3. Insert battery cable flatly into the battery connector of the inverter and ensure the bolts are tightened with a torque of 4~6Nm. Make sure polarity at both the battery and the inverter/charger is correctly connected and battery cables are tightly screwed to the battery connector.

AC Input/Output Connection

Suggested cable requirement for AC wires:

Steps to implement AC input/output connection:

1. Before making AC input/output connection, be sure to open DC protector or disconnector first.
2. Remove insulation sleeve 10mm for six conductors. Shorten phase L and neutral conductor N 3mm.
3. Insert AC input wires according to polarities indicated on the terminal block and tighten the terminal screws. Be sure to connect PE protective conductor (Ground) first.
   • Ground (yellow-green)
   • LINE (brown or black)
   • Neutral (blue)

4. Then, insert AC output wires according to polarities indicated on the terminal block and tighten terminal screws. Be sure to connect PE protective conductor (Ground) first.
5. This inverter is equipped with dual output. There are four terminals (main out-L/N, second out-L/N) available on the output port. It's set up through LCD program or monitoring software to turn on and off the second output in program 43. Refer to "LCD setting" section for the details in program 29 and 31.

Remark on Dual Output:

• The main output usually carries heavy loads which make the battery discharge time faster, such as air-conditioners, heaters, motors, and so on.
• The second output usually carries light loads which make the battery discharge time longer, such as lights, computers, fans, and so on.
• Normally, the cutoff point of the second out is lower than the main-out, so that the light loads will not be cut off power.

• Ground (yellow-green)
• LINE (brown or black)
• Neutral (blue)

PV Connection

Recommended cable requirement for PV wires:

PV Module Selection: When selecting proper PV modules, please be sure to consider below parameters:

1. Open circuit Voltage (Voc) of PV modules not exceeds max. PV array open circuit voltage of inverter.
2. Open circuit Voltage (Voc) of PV modules should be higher than min. battery voltage.

Solar Charging Mode Specifications:

Take the 450Wp and 550Wp PV module as an example. After considering the above two parameters, the recommended module configurations are listed in the table below.

PV Module Wire Connection:

1. Remove insulation sleeve 6 mm for positive and negative conductors.
2. Check correct polarity of connection cable from PV modules and PV input connectors. Then, connect positive pole (+) of connection cable to positive pole (+) of PV input connector. Connect negative pole (-) of connection cable to negative pole (-) of PV input connector.
3. Make sure the wires are securely connected.

Final Assembly

After connecting all wirings, replace the bottom cover by screwing the two screws back into place.

Lithium Battery Connection

If choosing a lithium battery for the inverter, you are allowed to use only the lithium battery which has been configured. There are two connectors on the lithium battery: RS485 port of BMS and power cable.

Steps to implement lithium battery connection:

1. Assemble battery terminal based on recommended battery cable and terminal size (same as Lead acid, see section Lead-acid Battery connection for details).
2. Connect the end of the RS485 port of the battery to the BMS (RS485) communication port of the inverter.

Lithium battery communication and setting: If choosing a lithium battery, make sure to connect the BMS communication cable between the battery and the inverter. This communication cable delivers information and signals between the lithium battery and the inverter. This information includes:

• Re-configure charging voltage, charging current, and battery discharge cut-off voltage according to the lithium battery parameters.
• Have the inverter start or stop charging according to the status of the lithium battery.

Make sure the lithium battery RS485 port connects to the inverter is Pin to Pin. The communication cable is inside the package and the inverter RS485 port pin assignment is shown below:

LCD setting for Lithium Battery: After connecting, you need to finish and confirm some settings:

1. Select program 05 as lithium battery type.
2. Confirm program 12/13/29/31/41/42 setting value.

Note: Program 43/44/45 are only available with successful communication; they will replace the Program 12/13/29 function. At the same time, program 12/13/29 become unavailable.

LCD Display for Lithium Battery: If communication between the inverter and battery is successful, there is some information showing on the LCD as follows:

Setting for PYLON US2000 lithium battery:

Dip Switch: There are 4 Dip Switches that set different baud rate and battery group address. If switch position is turned to the “OFF” position, it means "0". If switch position is turned to the “ON” position, it means "1".

• Dip 1 is "ON" to represent the baud rate 9600.
• Dip 2, 3 and 4 are reserved for battery group address.
• Dip switch 2, 3 and 4 on master battery (first battery) are to set up or change the group address.

NOTE: "1" is upper position and "0" is bottom position.

Process of install:

1. Use the RS485 cable to connect inverter and Lithium battery as Fig 1.
2. Switch on Lithium battery.
3. Press more than three seconds to start Lithium battery, power output ready.
4. Turn on the inverter.
5. Be sure to select battery type as "Li2" in LCD program 5. If communication between the inverter and battery is successful, the battery icon Li on LCD display will light.

Setting for lithium battery without communication: This suggestion is used for lithium battery application and to avoid lithium battery BMS protection without communication. Please finish the setting as follows:

A. Recommended method 1: Set battery type as “LIB” in program 05;

B. Recommended method 2: Setting as follows:

1. Before starting setting, you must get the battery BMS specification:
   • Max charging voltage
   • Max charging current
   • Discharging protection voltage
2. Set battery type as "LIB" in program 05;
3. Set C.V voltage as Max charging voltage of BMS-0.5V in program 26;
4. Set floating charging voltage as C.V voltage in program 27;
5. Set Low DC cut-off voltage ≥discharging protection voltage in program 29;
6. Set Max charging current in program 02 which must be less than the Max charging current of BMS.
7. Setting voltage point back to utility source when selecting "SBU priority" in program 12.

The setting value must be ≥Low DC cut-off voltage+2V, or else the inverter will have a warning as battery voltage low.

Remark:

1. You'd better to finish setting without turning on the inverter (just let the LCD show, no output);
2. When you finish setting, please restart the inverter.

Operating Instructions

Power ON/OFF

Once the unit has been properly installed and the batteries are connected, simply press the On/Off switch (located on the bottom of the case) to turn on the unit.

Operation and Display Panel

The operation and display panel, shown in the chart below, is on the front panel of the inverter. It includes three indicators, four function keys, and an LCD display, indicating the operating status and input/output power information.

LED Indicator:

Function Keys:

LCD Setting

After pressing and holding the ENTER button for 3 seconds, the unit will enter setting mode. Press "UP" or "DOWN" button to select setting programs. Then, press "ENTER" button to confirm the selection or ESC button to exit.

Setting Programs (Program 01: Output source priority):

Other LCD settings (Programs 02-50) are detailed in the user manual PDF. Please refer to the official PDF for comprehensive details on each program setting.

Reference: For a complete list of LCD settings and their descriptions, please refer to the User Manual (PDF), pages 11-20.

Battery Equalization

The equalization function is added to the charge controller to reverse the buildup of negative chemical effects like stratification, a condition where acid concentration is greater at the bottom of the battery than at the top. Equalization also helps to remove sulfate crystals that might have built up on the plates. If left unchecked, this condition, called sulfation, will reduce the overall capacity of the battery. Therefore, it's recommended to equalize the battery periodically.

How to Apply Equalization Function: You must enable the battery equalization function in monitoring LCD setting program 33 first. Then, you may apply this function in the device by either one of the following methods:

1. Setting equalization interval in program 37.
2. Active equalization immediately in program 39.

When to Equalize: In the float stage, when the setting equalization interval (battery equalization cycle) is reached, or equalization is activated immediately, the controller will start to enter the Equalize stage.

Equalize charging time and timeout: In the Equalize stage, the controller will supply power to charge the battery as much as possible until the battery voltage raises to the battery equalization voltage. Then, constant-voltage regulation is applied to maintain the battery voltage at the battery equalization voltage. The battery will remain in the Equalize stage until the setting battery equalized time is reached.

However, in the Equalize stage, when the battery equalized time expires and the battery voltage doesn't rise to the battery equalization voltage point, the charge controller will extend the battery equalized time until the battery voltage achieves the battery equalization voltage. If the battery voltage is still lower than the battery equalization voltage when the battery equalized timeout setting is over, the charge controller will stop equalization and return to the float stage.

Maintenance

Regular maintenance is crucial for the longevity and optimal performance of your SANDISOLAR inverter. Always ensure the unit is powered off and disconnected from all power sources (AC, DC, and PV) before performing any maintenance.

• Cleaning: Periodically clean the exterior of the inverter and ensure that the ventilation openings are free from dust and debris to maintain proper airflow and prevent overheating.
• Connection Checks: Regularly inspect all wiring connections (battery, AC input/output, PV input) to ensure they are secure and free from corrosion. Tighten any loose connections.
• Battery Health: Monitor battery voltage and performance. For lead-acid batteries, ensure proper electrolyte levels and perform equalization as needed. For lithium batteries, monitor communication and settings.
• Environmental Conditions: Ensure the inverter is operating within its specified temperature and humidity ranges. Avoid exposing the unit to direct sunlight, excessive moisture, or corrosive environments.
• Firmware Updates: Check the manufacturer's website or app for any available firmware updates to ensure your inverter has the latest features and bug fixes.

Troubleshooting

Fault Reference Code

If the inverter experiences a fault, an error code will be displayed. Refer to the table below for common fault codes and their explanations.

Warning Indicator

The inverter provides warning indicators for various conditions. Refer to the table below for warning codes, events, and audible alarms.

Specifications

Table 1 Line Mode Specifications

Table 2 Inverter Mode Specifications

Table 3 Charge Mode Specifications

Table 4 General Specifications

Wi-Fi Plug Pro Quick Installation Guideline

1. Schematic diagram of the Remove and install the wireless antenna

2.1 Download the APP

(1) Scan the QR code and download the APP (iPhone App Store; Android phone).

(2) Open the APP, click the "Registration" button, and select "Mobile phone Registration" or "Email Registration".

(3) Turn on Bluetooth or WiFi as needed.

2.2 Bluetooth connected to the digital collector

(1) Click the "Toolbox" and select "BLE network" or "Wi-Fi network" as required.

(2) If you choose the Bluetooth distribution network, you will automatically scan the nearby device on the "Bluetooth Pairing" page, find the PN corresponding to the digital collector, and click "Connect".

3. Add Datalogger

Login to the account and click the Datalogger button. Tap the "+" button on the top-right corner of the datalogger page. According to the prompts, type in the information to finish adding the datalogger. The PN number is located next to the machine appliance label. (Initial Password: 12345678)

4. Networking Settings

(1) Select the corresponding 2.4G WiFi according to the prompts, fill in the password and click "Start Connecting to the Network"; prompt on the WiFi distribution network reference APP page.

User Tips

• Optimal Performance: Ensure all connections are tight and correctly polarized to prevent efficiency loss and potential damage.
• Battery Management: Regularly check your battery's state of charge and consider using the equalization function for lead-acid batteries to prolong their lifespan.
• Monitoring: Utilize the built-in WiFi and mobile app to monitor your system's performance in real-time and receive alerts.
• Load Balancing: If using dual outputs, distribute your loads appropriately, placing heavy loads on the main output and lighter, critical loads on the second output to maximize battery runtime for essential appliances.
• Environmental Control: Keep the inverter in a well-ventilated area within the recommended temperature range to prevent overheating and ensure stable operation.

Warranty and Support

The SANDISOLAR 4.2KW 24V Solar Inverter comes with a 1-year warranty from the store. For any technical support or warranty claims, please contact the SANDISOLARGLOBAL Store directly. Ensure you have your product model (SD-HYM-2442HW) and purchase details ready.

The seller, SANDISOLARGLOBAL Store, has a 100.0% positive feedback rate, indicating a commitment to customer satisfaction.