MIDEA M1-S4.6K (01) PDF MANUAL

The manual uses symbols to ensure the safety of persons and property, as well as the efficient operation of the inverter. Please read the symbol explanations carefully to prevent injury or property damage.

• DANGER: Non-observance will result in death or serious injury. Follow the warnings to prevent death or serious injury.
• WARNING: Non-observance will result in death or serious injury. Follow the warnings to prevent serious injury.
• CAUTION: Non-observance may result in minor injury. Follow the warnings to prevent injury.
• ATTENTION: Non-observance may result in property damage. Follow the warnings to prevent damage to or destruction of the product.
• NOTE: Provides tips essential to the optimal operation of the product.

This manual is intended for specialist electrical engineers responsible for installation and commissioning, as well as PV Storage system operators. For safety reasons, the inverter may only be installed by a qualified electrician who:

• has received training on occupational safety, as well as the installation and commissioning of electrical systems.
• is familiar with the local laws, standards and regulations of the grid operator.

The manufacturer assumes no responsibility for the destruction of property or any injuries to personnel caused by improper usage.

Installation:

• Read and understand all instructions and safety symbols in the manual before beginning installation.
• Obtain official authorization from the local power grid operator before connecting to the power grid.
• Before installing or performing maintenance, open the DC switch to interrupt the DC voltage of the PV generator. Not doing this may result in serious injury.
• Install the inverter on a suitable, upright surface with sufficient load-bearing capacity (e.g., walls, PV frames).
• Ensure sufficient space for maintenance and sufficient ventilation for cooling.

Electrical Connection:

• Before establishing the electrical connection, cover the PV modules with opaque material or disconnect the PV generator. Solar radiation generates dangerous voltage.
• All installations and electrical connections must be carried out by trained electricians.
• Wait a minimum of 5 minutes after switching off the AC circuit breaker and the DC switch before starting any maintenance or repair work, to allow capacitors to discharge.

Operation:

• During operation, some internal components and the housing can become very hot. Wear protective gloves and keep children away.
• Do not open the inverter or remove any labels.

Repair and Maintenance:

• If any maintenance or repairs are required, contact the nearest authorized service center. Do NOT carry out repairs yourself.
• The internal components of the inverter must NOT be opened without relevant authorization.

• If there is no available power from batteries or PV modules in backup mode, the backup power supply will be automatically terminated.
• The Back-Up switching time is normally less than 3 seconds, but external factors can cause failure.
• Do not connect loads that are dependent on a stable energy supply for a reliable operation.
• Do not connect loads whose total capacity is greater than the maximum Back-Up capacity.
• Do not connect loads that may cause very high start-up current surges (e.g., nonfrequency conversion air conditioning, vacuum cleaner, hair dryer, hammer drill).
• Battery current may be limited by factors like temperature and weather.
• BACK-UP is not recommended if the PV system is not configured with batteries.
• If a single overload protection occurs, the inverter can restart automatically. If it happens several times, the restarting time will be extended.
• If the load capacity exceeds the inverter’s rated power when the grid is disconnected, the off-grid function will close automatically. To enable it, turn off the large loads.

Declaration for Back-Up Overload Protection:

The inverter will restart in case of overload protection. The time required for restarting will increase (5 min at most) if overload protection repeats. Try to reduce Back-Up load power within maximum limitation or remove loads which may cause very high start-up current surges.

The following table provides information on recommended backup loads and their power consumption. This data is based on tests with batteries at -20 ~ 55 °C, 5-100% SOC. For actual applications, refer to the maximum output capacity of the battery used.

• Mode 1: Maximize Self-consumption: Suitable for areas with high electricity tariffs. Priority is given to the local load, then to battery storage, and finally to selling to the grid. When PV power is insufficient, the battery discharges to the local load, and if needed, power is purchased from the grid.
• Mode 2: Maximize Feed-in: Suitable for areas with high feed-in tariffs. When PV power is greater than inverter capacity, excess electricity is stored in the battery. When PV power is less than inverter capacity, the electricity is sold to the grid.
• Mode 3: Backup power: Suitable for areas with frequent grid outages. A reserved Backup SOC (State of Charge) is set. The battery can only be charged until it reaches this reserved value. Above this value, the battery behaves as in Self-use mode.
• Mode 4: Charge and discharge schedule: Suitable for areas with peak and valley electricity prices. You can set specific periods for charging and discharging the battery. For the rest of the time, it behaves as in Self-use mode.
• Mode 5: Peak shaving: This function avoids exceeding a set peak kW limit from the grid by dynamically overriding the max kW limit on the battery.

The maximum allowable charge/discharge current is limited by temperature, maximum power of the inverter, and the maximum/recommended current from the battery manufacturer. The inverter manages the battery based on its State of Charge (SoC) and whether it’s grid-connected or off-grid.

The product is thoroughly tested before delivery, but damage may occur during shipping. Please conduct a thorough inspection after receiving the product:

• Check the packing case for any visible damage.
• Check the scope of delivery for completeness according to the packing list.
• Check the inner contents for damage after unpacking.

If there is any damage or incompleteness, contact the after-sales service provider or transport company and provide photos. It is recommended to store the device in the original packing case for when the product is decommissioned.

• Do not unpack the inverter.
• Keep the storage temperature at -40°C to +70°C and the humidity at 5%- 95% RH.
• Store the inverter in a clean, dry place, protected from dust and water vapor corrosion.
• A maximum of 6 units can be stacked. Stack with caution to prevent them from falling over.
• Periodic inspections are required during storage. Replace packing materials if necessary.
• If stored long-term, inspections and tests should be conducted by qualified personnel before use.

Basic Environmental Requirements:

• The inverter is protected to IP65 and can be installed indoors or outdoors.
• Do not install where personnel can easily touch its enclosure and heat sinks, as these parts get very hot.
• Do not install in areas with flammable or explosive materials.
• Do not install within children’s reach.
• Do not install outdoors in salt areas (within 500 meters from the coast or prone to sea breeze) as it can cause corrosion and fire.
• Install in a well-ventilated environment for good heat dissipation. A sheltered place or one with an awning is recommended.

Mounting Requirements:

• The mounting structure must be fireproof. Do not install on flammable building materials.
• The installation surface must be solid enough to bear the inverter’s weight.
• In residential areas, do not install on drywalls or walls with weak sound insulation, as the inverter generates noticeable noise.

Angle and Space Requirements:

• Install the inverter vertically (tilted no more than 15°). Never install it horizontally, at a forward/backward tilt, side tilted, or upside down.
• Reserve enough space around the inverter for installation and heat dissipation:
  • ≥ 300mm above
  • ≥ 500mm below
  • ≥ 200mm on the left side
  • ≥ 200mm on the right side
  • ≥ 300mm in front

Step 1: Place the wall-mounting bracket in a proper position on the wall. Use a spirit level to ensure the bubble is in the middle position. Mark the hole positions with a marker and drill the holes (Ø8mm, Depth 45-50mm).

Step 2: Insert the expansion bolts into the holes and fix the mounting bracket to the wall. Tighten the bolts to 5±0.2Nm.

Step 3: Lift the inverter and slide it down along the wall mounting bracket, ensuring they match perfectly. Use two M4*10 screw sets (one on each side) to lock the inverter to the bracket. Tighten to 1.2±0.2Nm.

ATTENTIONS:

• If local standards have other requirements for cables, set the cable specification according to the local standard.
• Factors that affect cable selection include rated current, cable type, routing mode, ambient temperature, and maximum expected line loss.
• The cabling distance between the battery and the inverter should be less than 10m, and within 5m is recommended.

Connect the inverter to the equipotential bonding bar using the protective earth cable (PE) for grounding. The inverter is transformerless, so the plus and minus poles of the PV generator must NOT be earthed.

1. Strip 6 mm of insulation from the 4 mm² grounding cable. The stripped length should be 8-10 mm.

2. Attach a terminal lug and cover it with heat-shrink tubing.

3. Crimp the terminal onto the wire.

4. Attach the grounding cable to the grounding terminal on the inverter using an M4 screw. Tighten to 1.2±0.2Nm.

The blue connector is for the grid, and the black connector is for backup. The installation and line connection are the same for both. Each inverter must have its own circuit breaker, and the AC disconnecting device must be easily accessible.

Cable Connection Explanation:

• L: Phase 1 (brown)
• N: Neutral conductor (blue)
• PE: Grounding cable (yellow-green)

Procedure:

1. Disassemble the AC connector. Strip the wires and insert them into the correct terminals (L, N, PE). Tighten the screws to 1.2±0.2Nm.

2. Assemble the connector housing and screw the cable gland tight.

3. Connect the AC connector to the corresponding AC port on the inverter (AC GRID or AC BACKUP) by turning it clockwise until it clicks and locks into place.

To remove the AC connector, turn it anticlockwise.

The connection steps for battery and PV cables are the same, but the terminal specifications differ. The battery terminal is blue, and the PV terminal is black.

Creating the PV Connectors:

1. Strip 7 mm of insulation from the red (+) and black (-) 4 mm² PV cables.

2. Crimp the metal contacts onto the stripped ends of the wires.

3. Insert the crimped wires into the corresponding positive (red) and negative (black) connector housings until they click.

4. Tighten the screw caps onto the connector housings using an MC4 Wrench.

Installing the PV and Battery Connectors:

1. Rotate the DC switch on the inverter to the “OFF” position.

2. Check the polarity and open-circuit voltage of the PV string to ensure it does not exceed the inverter input limit of 600V.

3. Connect the PV connectors to the corresponding PV1/PV2 terminals and the Battery connectors to the BAT terminals until there is an audible click.

NOTE: Insert the protective caps into any unused DC connections. Before removing a plus and minus connector, ensure the DC switch has been set to OFF.

Before commissioning, ensure that the DC and AC voltages are within the permissible range of the inverter. Perform the following checks:

1. If a battery is connected, turn on the battery switch.

2. Turn on the AC switch between the inverter and the power grid.

3. Turn on the DC switch (if any) between the PV string and the inverter.

4. Turn on the DC switch at the bottom of the inverter.

5. Wait for about 1 minute and observe the LED indicators on the inverter to check its running status.

If the inverter needs to be shut down for electrical inspection, please follow these steps:

1. Turn off the AC switch between the inverter and the power grid.

2. Turn off the DC switch at the bottom of the inverter.

3. If there is a DC switch between the inverter and PV string, turn off the DC switch.

4. Turn off the DC switch at the battery (Optional).

5. Wait for 5 minutes before checking the inverter.

Inverters do not generally require daily or routine maintenance. Before cleaning, ensure the DC switch and AC circuit breaker have been switched off. Wait at least 5 minutes before carrying out cleaning.

Cleaning the inverter:

Clean the inverter using an air blower and a dry, soft cloth or a soft bristle brush. Do NOT clean the inverter with water, corrosive chemicals, or cleaning agents.

Cleaning the heat sink:

To ensure correct long-term operation, check the heat sink for blockages (dust, snow, etc.) and remove them if present. Clean the heat sink using an air blower and a dry, soft cloth or a soft bristle brush. Do not clean the heat sink with water, corrosive chemicals, or cleaning agents.

First, check for warnings, error messages, or error codes displayed on the screen of the app. If no error information is displayed, check if the following requirements have been fulfilled:

• Has the inverter been set up in a clean, dry, well-ventilated area?
• Is the DC switch set to ON?
• Are the cables sufficiently dimensioned and short enough?
• Are the input connections, output connections, and the wiring all in good condition?
• Are the configuration settings for the relevant installation correct?
• Are the communication cables correctly connected and undamaged?

Error List:

Removing the inverter:

Before removing, power off the AC and DC (batteries).

1. Disconnect all cables from the inverter (RS485, DC input, AC output, PGND).

2. Remove the inverter from the mounting bracket.

3. Remove the mounting bracket from the wall.

Packing the inverter:

• If the original packing materials are available, put the inverter inside them and seal with adhesive tape.
• If not available, put the inverter inside a suitable cardboard box and seal it properly.

Disposing of the inverter:

If the inverter service life expires, dispose of it according to the local disposal rules for electrical equipment waste. This product complies with the WEEE Directive and should not be disposed of with other household waste.