MIDEA M1-S4K (01) PDF MANUAL

The manual uses symbols to ensure the safety of persons and property. The meanings are as follows:

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.

The following symbols may also be found on the inverter:

Qualified Personnel:

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:

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

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

Electrical Connection:

• DANGER: Before establishing the electrical connection, cover the PV modules using opaque material or disconnect the PV generator. Solar radiation will cause dangerous voltage.

• All installations and electrical connections may only be carried out by trained electricians.

• Obtain authorization from the local power grid operator before connecting the inverter to the public power grid.

Operation:

• DANGER: 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.

• CAUTION: While the inverter is operating, several internal components will become very hot. Wear protective gloves and keep children away.

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.

The Hybrid Inverter can work in standby, operating, or shutdown mode.

Mode1: Maximize Self-consumption

This mode is suitable for areas with high electricity tariff. When the PV power is sufficient, priority is given to the local load, and the excess electricity goes to energy storage, and if there is still energy left, it is sold to the grid. When the PV power is insufficient/there is no PV power, the battery is discharged for the local load, and when the battery discharge power and photovoltaic power can not meet the load demand, the insufficient power will be purchased from the grid.

Mode2: Maximize Feed-in

This mode is suitable for areas with high feed-in tariff. When the PV power is greater than the inverter capacity, the excess electricity will be stored by energy storage. When PV power is less than the inverter capacity, the excess electricity will be sold to the grid.

Mode3: Backup power

This mode is suitable for areas where grid outages occur frequently or to prevent grid outages. Reserved Backup SOC setting value can be adjusted, when battery SOC is less than reserved SOC value, battery can only be charged, until SOC reaches reserved value, the battery will be stopped charging; when SOC is larger than SOC setting value, battery will behave as Self-use mode.

Mode4: Charge and discharge schedule

This mode is suitable for areas with peaks and valleys in electricity prices Battery charging period and discharging period can be set, during charging period, battery can only be charged, while in discharging period, battery can only be discharged, the rest of the period, battery will behave as Self-use mode.

Mode5: Peak shaving

This function is to avoid exceeding peak kW limit from grid, by dynamically overriding the max kW limit on the battery. Users can set the peak kW value.

1. For hybrid inverters, the electrical installation typically includes connection of the inverter to both PV modules and batteries. If there is no available power from batteries or PV modules in backup mode, the backup power supply will be automatically terminated.

2. Normally, the Back-Up switching time is less than 3 s. However, some external factors may cause the system to fail on Back-Up mode. Therefore, the users must be aware of conditions and follow the instructions as below:

• Do not connect loads that are dependent on a stable energy supply for a reliable operation.

• Do not connect the loads whose total capacity is greater than the maximum Back-Up capacity.

• Do not connect the loads that may cause very high start-up current surges, such as nonfrequency conversion air conditioning, vacuum cleaner or half-wave loads such as hair dryer, heat gun, hammer drill.

• Due to the condition of the battery itself, battery current might be limited by some factors, including but not limited to the temperature and weather.

• 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, the off-grid function of the inverter will be closed automatically if the load capacity exceeds the inverter’s rated power; to enable it, turn off the large loads and ensure the load power is less than the rated power of the inverter.

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 the loads which may cause very high start-up current surges.

The data of the compatibility for backup of Hybrid Inverter are based on the test with batteries (-20 ~ 55 °C, 5-100% SOC). For the actual application, please refer to the maximum output capacity of the battery used.

The maximum allowable charge/discharge current is limited by temperature, the maximum power of the inverter, and the maximum recommended charge/discharge current from the battery manufacturer. The inverter cannot respond to discharge/charge commands when operating off-grid.

The product is thoroughly tested and strictly inspected before delivery. Nonetheless, damage may still occur during shipping. For this reason, 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.

The following requirements should be met if the M1 series inverter is not put into use directly:

• Do not unpack the M1 series inverter.

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

• The M1 series 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. To avoid personal injury or device damage, stack M1 series inverter with caution to prevent them from falling over.

• Periodic inspections are required during the storage. Replace the packing materials if necessary.

• If the M1 series inverter has been long-term stored, inspections and tests should be conducted by qualified personnel before it is put into use.

Basic Requirements:

• The Hybrid Inverter is protected to IP65 and can be installed indoors or outdoors.

• Do not install where personnel can easily come into contact with its enclosure and heat sinks, as these parts get extremely 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) as it may corrode and cause fire.

• Must be installed in a well-ventilated environment. A sheltered place or 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 weight of the inverter.

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

Angle Requirements:

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

Space Requirements:

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

• Above: ≥ 300mm

• Below: ≥ 500mm

• Sides: ≥ 200mm

ATTENTION: Mechanical damage

• In order to prevent injuries and damage to the device, ensure that the inverter is kept balanced while it is being moved – it is very heavy.

• Do not place the inverter on its connections, as these are not designed to bear its weight. Place the inverter horizontally on the ground.

• When you place the inverter on the ground, place foamed material or paper underneath it in order to protect its housing.

Step 1. Placing the wall-mounting bracket to a proper position on the wall. Mark the positions by marker and drill the holes. (Observe the level on the bracket and adjust until the bubble is in the middle position). Drill holes with a diameter of 8mm and depth of 45-50mm.

Step 2. Placing and fixing the expansion Bolts in the holes, and Installing the mounting bracket. Tighten the bolts to 5±0.2Nm.

Step 3. Lift the inverter and slide it down along the wall mounting bracket to make sure they match perfectly. Use two screw sets (M4*10) to lock both left and right sides. Tighten the screws to 1.2±0.2Nm.

ATTENTIONS:

• If local standard have other requirements for cables, set the cable specification according to the local standard.

• The 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 by using the protective earth cable (PE) for grounding.

ATTENTION: Pole Grounding not permissible!

As the inverter is transformerless, the plus and minus poles of the PV generator must NOT be earthed. Otherwise, the inverter will malfunction. In the PV system, not all live metal parts (e.g. PV module frames, PV frame, generator connection box housing, inverter housing) require Grounding.

Steps:

1. Strip 6 mm of insulation from the 4 mm² ground cable. Strip 8-10 mm from the other end to expose the wire for the terminal.

2. Place heat-shrink tubing over the cable and crimp the ground terminal onto the exposed wire.

3. Use a crimping tool to secure the terminal.

4. Attach the ground terminal to the grounding point on the inverter using an M4 screw, and tighten to 1.2±0.2Nm.

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

Connector Installation Steps:

1. Strip 30-50 mm of the outer insulation from the AC cable.

2. Insert the wires into the appropriate terminals on the connector plug. Tighten the screws to 1.2±0.2Nm.

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

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

NOTE:

• Remove the AC connector by turning it anticlockwise.

• When you use the meter connection function, make sure that the AC terminal cable corresponds to the meter cable one by one (L, N, and PE cables).

NOTE: The connection steps for the battery and PV are the same, but the terminal specifications are different. The battery terminal is blue, and the PV terminal is black.

Installing the PV Connectors (on the cable):

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

2. Crimp the metal contacts onto the stripped ends of the wires using a crimping tool.

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

4. Tighten the end caps of the connectors using an MC4 wrench.

Installing PV Connector to Inverter:

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

Step 2. Check the cable connection of the PV string for correct polarity and ensure the open-circuit voltage does not exceed the inverter input limit of 600V using a multimeter.

Step 3. Connect the PV connectors to the corresponding PV1 or PV2 terminals on the inverter until there is an audible click.

Installing Battery Connector:

Follow the same process as the PV connector, but use the blue battery connectors and connect them to the BAT+ and BAT- terminals on the inverter until they click.

NOTE: Insert the protective caps into any unused DC connections. To remove connectors, ensure the DC switch is OFF and use a removal key.

The Enable cable and RJ45 cable are used for communication between the inverter and a Li-ion battery.

Step 1 (optional): If not using a pre-made cable, thread the communication cable (4.8-6mm diameter) through the waterproof component. Strip the insulation layer, lead out the signal cables, insert them into the RJ45 plug in the correct order, and crimp it with a crimper. Tighten the waterproof cover before installing the connector.

*Skip this step if a standard network cable with an RJ45 plug is prepared.

Step 2: Find the BMS terminal under the inverter. Insert the RJ45 plug into the BMS terminal, confirming it is inserted correctly. Then, tighten the waterproof screw cap.

The Smart Meter with a Current Transformer (CT) is used to measure the power flow at the point of grid interconnection. The CT is usually installed on the L wire between the house loads and the power grid.

Meter Terminal Definitions:

Communication Terminal Definition (Inverter to Meter):

Procedure:

1. Remove the protective cap from the USB interface on the inverter.

2. Install the Wireless stick.

3. Tighten the connecting nut.

Multi-COM Port Definition:

RJ45 Terminal Definition (Color Code):

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

Cleaning the heat sink: To help guarantee correct long-term operation, make sure there is sufficient space for ventilation around the heat sink. Check the heat sink for blockages (dust, snow etc.) and remove them if present. Please 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, cleaning agents etc.

To carry out troubleshooting, proceed as follows:

• Check the warnings, error messages or error codes displayed on the screen of the app.

If no error information is displayed on the screen, check whether 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 the communication cables correctly connected and undamaged?

Error List:

Removing the inverter:

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

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.

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.