MIDEA M1-S6K (01) PDF MANUAL

The manual uses symbols to ensure the safety of persons and property and the efficient operation of the inverter. The symbols are explained below:

DANGER

Non-observance will result in death or serious injury.

Follow the warnings in order to prevent death or serious injury!

WARNING

Non-observance will result in death or serious injury.

Follow the warnings in order to prevent serious injury!

CAUTION

Non-observance may result in minor injury.

Follow the warnings in order to prevent injury!

ATTENTION

Non-observance may result in property damage!

Follow the warnings in order to prevent damage to or destruction of the product.

NOTE

Provides tips essential to the optimal operation of the product.

Qualified Personnel

For safety reasons, this 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.

Installation Requirements

• Install the inverter on a suitable object with sufficient load-bearing capacity (e.g., walls, PV frames etc.) and ensure the inverter is upright.

• Ensure sufficient space for an emergency exit and sufficient ventilation for cooling.

Electrical Connection

• Dangerous DC voltage: Before establishing the electrical connection, cover the PV modules using opaque material or disconnect the PV generator from the inverter. Solar radiation will cause dangerous voltage to be generated by the PV generator!

• Danger through electric shock: All installations and electrical connections may only be carried out by trained electricians!

• Authorization for grid feed-in: Obtain authorization from the local power grid operator before connecting the inverter to the public power grid.

Operation

• Dangerous voltage: Before carrying out any repair work, first switch off the AC circuit breaker between the inverter and power grid, and then the DC switch.

• After switching off the AC circuit breaker and the DC switch, wait a minimum of 5 minutes before starting any maintenance or repair work.

• Electric shock: Contact with the electrical grid or the device’s terminals may result in an electric shock or fire! Do not touch the terminal or the conductor which is connected to the electrical grid.

• Burning due to hot housing: While the inverter is being operated, several internal components will become very hot. Please wear protective gloves and keep children away from the device.

Repair and Maintenance

• Unauthorized repairs are not permitted. If repairs are required, contact a local authorized service center.

• The internal components of the inverter must NOT be opened without relevant authorization.

General Working Modes

• Standby: The inverter enters this mode when the external environment doesn’t meet operating requirements. It continuously checks status and enters Operating mode when requirements are met.

• Operating: The inverter converts DC power from PV strings into AC power for the grid. It tracks the maximum power point to maximize output. It enters Shutdown mode if it detects a fault or command.

• Shutdown: The inverter enters this mode after detecting a fault or shutdown command. It will enter Standby mode once the fault is rectified or a startup command is given.

PV Energy Storage System (PV ESS) Working Modes

• Mode 1: Maximize Self-consumption: Suitable for areas with high electricity tariffs. Priority is given to the local load, then energy storage, and finally selling to the grid. If PV power is insufficient, the battery discharges, and if needed, power is purchased from the grid.

• Mode 2: Maximize Feed-in: Suitable for areas with high feed-in tariffs. If PV power is greater than inverter capacity, excess is stored. If PV power is less than inverter capacity, excess 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 only charges until it reaches the reserved value and then stops. When SOC is above the set value, it behaves in Self-use mode.

• Mode 4: Charge and discharge schedule: Suitable for areas with peak and valley electricity prices. You can set specific charging and discharging periods. Outside these periods, the battery behaves in Self-use mode.

• Mode 5: Peak shaving: Avoids exceeding a peak kW limit from the grid by dynamically overriding the max kW limit on the battery. Users can set the peak kW value.

1. If there is no available power from batteries or PV modules in backup mode, the backup power supply will be automatically terminated.

2. The Back-Up switching time is normally less than 3 seconds. However, external factors may cause the system to fail on Back-Up mode.

• 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., non-frequency conversion air conditioning, vacuum cleaner, hair dryer, hammer drill).

• BACK-UP is not recommended if the PV system is not configured with batteries.

• When single overload protection occurs, the inverter can restart automatically; however, the restarting time will be extended if it happens several times.

• When the grid is disconnected, if the load capacity exceeds the inverter’s rated power, the off-grid function will close. To enable it, turn off large loads and ensure the load power is less than the rated power of the inverter.

The following loads are recommended for use with the back-up function under an off-grid situation. This data is based on tests with batteries (-20 ~ 55 ℃, 5-100% SOC). For actual application, refer to the maximum output capacity of the battery used.

Damage may occur during shipping. Please conduct a thorough inspection after receiving the product.

1. Check the packing case for any visible damage.

2. Check the scope of delivery for completeness according to the packing list.

3. Check the inner contents for damage after unpacking.

Do not dispose of the original packing case. It is recommended to store the device in the original packing case when the product is decommissioned.

If the inverter is not put into use directly, the following requirements should be met:

• Do not unpack the inverter.

• Keep the storage temperature at -40°C to +70°C and the humidity at 5%-95% RH.

• The inverter should be stored in a clean and dry place and be 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 the packing materials if necessary.

• If the inverter has been stored long-term, inspections and tests should be conducted by qualified personnel before it is put into use.

Mounting Structure and Location

• The mounting structure must be fireproof.

• Do not install on flammable building materials.

• The installation surface must be solid enough to bear the weight of the heavy inverter.

• In residential areas, do not install on drywalls or walls with weak sound insulation, as the noise generated by the inverter may be noticeable.

• The inverter is IP65 rated and can be installed indoors or outdoors.

• Do not install where personnel can easily touch the enclosure and heat sinks, as they become very hot during operation.

• Do not install in areas with flammable or explosive materials, or within children’s reach.

• Avoid installing outdoors in salt areas (within 500 meters from the coast) as it can cause corrosion and fire.

• Install in a well-ventilated environment. A sheltered place or one with an awning is recommended.

Angle Requirements

Install the inverter vertically. Never install it horizontally, tilted forward/backward, side-tilted, or upside down. A slight backward tilt of less than 15 degrees is permissible.

Space Requirements

Reserve enough space around the inverter for installation and heat dissipation:

• Above: ≥ 300mm

• Below: ≥ 500mm

• Sides: ≥ 200mm

Step 1: Install the mounting bracket

1. Place the wall-mounting bracket in a proper position on the wall. Use the spirit level on the bracket to ensure it is level (the bubble should be in the middle).

2. Mark the positions for the holes with a marker.

3. Drill the holes (Ø8, Depth 45-50mm).

4. Insert the expansion bolts into the holes.

5. Fix the mounting bracket to the wall using the bolts, tightening to 5±0.2Nm.

Step 2: Mount the inverter

1. Lift the inverter and slide it down along the wall mounting bracket, ensuring they match perfectly.

2. Use two screw sets (M4*10) to lock both the left and right sides of 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.

Step 1: Prepare the cable

1. Strip 6 mm of insulation from the end of the 4 mm² ground cable.

2. Place a heat-shrink tubing over the cable.

Step 2: Crimp the terminal

1. Insert the stripped end of the cable into the ground terminal.

2. Use a crimping tool to secure the terminal to the cable.

3. Slide the heat-shrink tubing over the crimped part and apply heat to shrink it.

Step 3: Connect to the inverter

1. Locate the grounding terminal on the side of the inverter.

2. Secure the ground cable to the terminal using the M4 screw.

3. Tighten the screw to 1.2±0.2Nm.

The AC power cables connect the inverter to critical loads (via AC-BACKUP port) and the power grid (via AC-GRID port). The blue connector is for the grid, and the black connector is for backup. The installation process is the same for both.

Step 1: Prepare the AC Connector

1. Disassemble the AC connector.

2. Strip the outer jacket of the AC cable (30-50 mm).

3. Strip the insulation from the individual wires (L, N, PE).

4. Insert the wires into the correct terminals of the connector. The connections are as follows:

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

5. Tighten the terminal screws to 1.2±0.2Nm.

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

Step 2: Connect to the Inverter

1. Plug the assembled AC connector into the corresponding port on the inverter (AC-GRID or AC-BACKUP).

2. Turn the connector clockwise until it clicks and locks into place.

Note: To remove the AC connector, turn it anticlockwise.

The connection steps for the battery and PV cables are the same, but the terminal specifications and colors differ. Battery terminals are blue; PV terminals are black.

Step 1: Prepare the Cable

1. Strip 7 mm of insulation from the end of the DC cable (e.g., 4 mm²).

Step 2: Crimp the Metal Contact

1. Insert the stripped cable end into the metal contact pin.

2. Use a crimping tool to secure the pin to the cable.

Step 3: Assemble the Connector

1. Insert the crimped pin into the back of the plastic connector housing (positive or negative).

2. You will hear a “click” when it is correctly inserted.

3. Screw the back cap onto the connector housing. Use an MC4 wrench to tighten it securely.

Step 4: Connect to the Inverter

1. Ensure the DC switch on the inverter is in the “OFF” position.

2. For PV strings, check the polarity and ensure the open-circuit voltage does not exceed the inverter’s input limit of 600V.

3. Connect the assembled PV and/or Battery connectors to the corresponding positive (+) and negative (-) terminals on the bottom of the inverter.

4. Push them in until you hear an audible “click”.

5. Insert protective caps into any unused DC connections.

CAUTION: Danger of DC arcing. Before removing the plus and minus connector, ensure that the DC switch has been set to OFF.

This cable is for communication between the inverter and a Li-ion battery.

Step 1 (Optional – for custom cables):

If you are not using a standard pre-made network cable, follow these steps:

1. Thread the communication cable through the waterproof component (nut, seal, etc.).

2. Strip the outer insulation layer of the cable.

3. Insert the individual signal wires into an RJ45 plug in the correct order for your battery’s BMS.

4. Crimp the RJ45 plug with a crimper.

5. Before installing, tighten the waterproof cover/gland.

Step 2: Connect to Inverter

1. Find the BMS terminal under the inverter.

2. Insert the RJ45 plug into the BMS terminal until it clicks.

3. Tighten the waterproof screw cap to secure the connection.

The Smart Meter measures the power flow at the point of grid interconnection. The Current Transformer (CT) is usually installed on the L (Live) wire between the house loads and the power grid.

Connection Diagram:

1. Clamp the CT around the main live (L) wire from the grid. Ensure the arrow (P1 -> P2) on the CT points towards the house loads.

2. Connect the two wires from the CT to the L-S1 (terminal 1) and L-S2 (terminal 2) on the Smart Meter.

3. Connect a power supply for the meter. Take a live feed from the grid side and connect to L (terminal 4) on the meter. Take a neutral feed and connect to N (terminal 3) on the meter.

4. Connect the communication cable between the Smart Meter and the inverter:

• Connect a wire from the meter’s A+ (terminal 10) to the inverter’s Multi-com RJ45 Pin 1 (RS485+).

• Connect a wire from the meter’s B- (terminal 9) to the inverter’s Multi-com RJ45 Pin 2 (RS485-).

• Connect a wire from the meter’s GND (terminal 8) if required by the setup.

The energy meter is preconfigured. If you need to change settings, you can do so via the meter’s display and buttons.

Procedure:

1. Locate the wireless communication port at the bottom of the inverter.

2. Remove the protective cap from the USB interface.

3. Install the Wireless stick into the port.

4. Tighten the connecting nut to secure it.

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.

Before carrying out cleaning, ensure that the DC switch and AC circuit breaker between the inverter and power grid have been switched off. Wait at least 5 minutes before carrying out cleaning.

Cleaning the inverter

Clean the inverter housing 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 or error codes displayed in the monitoring app. If no error information is displayed, check the following:

• 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?

If an earth fault alarm occurs, the error is displayed on the LED indicators (the red light will illuminate).

Refer to the following table for specific alarm codes and troubleshooting steps:

Removing the inverter

Before removing the inverter, power off the AC and DC (batteries) as per the power-off procedure.

1. Disconnect all cables from the inverter, including RS485 communications cables, DC input power cables, AC output power cables, and PGND cables.

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 then seal them by using adhesive tape.

• If the original packing materials are 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 EU WEEE Directive and bears a classification symbol for waste electrical and electronic equipment (WEEE). This symbol indicates that this product shall not be disposed of with other household wastes at the end of its service life. The used device must be returned to an official collection point for recycling. Each household performs an important role in recovering and recycling old appliances.