MIDEA M1-S5K (01) PDF MANUAL

Read and understand the instructions within this manual and familiarize yourself with the relevant safety symbols in this chapter before beginning with the installation of the device and eliminating any faults.

Before connecting to the power grid, you must obtain official authorization from the local power grid operator in accordance with the corresponding national and state requirements. Furthermore, operation may only be carried out by qualified electricians.

Before installing the device or carrying out maintenance on it, you must open the DC switch in order to interrupt the DC voltage of the PV generator. You can also switch off the DC voltage by opening the DC switch in the generation junction box. Not doing this may result in serious injury.

Qualified Personnel:

Personnel tasked with the operation and maintenance of the device must have the qualifications, competence and experience required to perform the described tasks, while also being capable of fully understanding all instructions contained within the manual. 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:

Please install the inverter according to the information contained in the following section. Mount the inverter to a suitable object with a sufficient load-bearing capacity (e.g. walls, PV frames etc.) and ensure that the inverter is upright. Choose a suitable place for the installation of electrical devices. Ensure that there is sufficient space for an emergency exit which is suitable for maintenance. Ensure sufficient ventilation in order to guarantee an air circulation for the cooling of the inverter.

Transport Requirements:

The factory packaging is specifically designed to prevent transport damage. However, the device must not be installed if it is visibly damaged.

Labelling on the device:

The labels must NOT be concealed by items and foreign objects; they must be regularly cleaned and kept clearly visible at all times.

Electrical Connection:

Observe all applicable electrical regulations when working with the Solar inverter.

DANGER: 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: Danger through electric shock!

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

IMPORTANT: Authorization for grid feed-in

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

NOTE: Voiding of guarantee

• Do not open the inverter or remove any of the labels. Otherwise, the guarantee will be voided.

Operation:

DANGER: 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.

• Follow all instructions and observe all safety documents that refer to the grid connection.

CAUTION: Burning due to hot housing

• While the inverter is being operated, several internal components will become very hot.

• Please wear protective gloves!

• Keep children away from the device!

Several symbols pertaining to safety can be found on the inverter. Please read and understand the content of these symbols before starting the installation.

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.

Please refer to this information before you use the back-up function of the inverter under off-grid situation.

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

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.

The maximum allowable charge/discharge current is limited to the smaller value among the following:

• Temperature;

• the maximum power of inverter;

• the maximum / recommended charge/discharge current from the battery manufacturer.

For this reason, the battery charge power may not reach the nominal power. The inverter cannot respond to discharge/charge command when operating off-grid.

The following product and accessories are included. The actual product received may differ.

• Energy manager*1

• Smart meter + current transformer*1

• D4 Disassembly tool*1

• Photovoltaic connector – straight male*2

• Photovoltaic connector – straight female*2

• Battery connector – straight male*1

• Battery connector – straight female*1

• Multi-COM (2-RJ45+22pin)

• Backup connector

• Grid-connected connector

• ground terminal*2

• Wireless module*1

• mounting bracket*1

• Electric meter communication Line*1

• expansion bolt*4

• SEM screw M4X12*4

• RJ45 connector*1

• Quick guide*1

• Packing list*1

• User manual*1

• Delivery inspection report*1

• Quality certificate*1

• Warranty card*1

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 out doors.

• Do not install the Hybrid Inverter in a place where personnel are easy to come into contact with its enclosure and heat sinks, because these parts are extremely hot during operation.

• Do not install the Hybrid Inverter in areas with flammable or explosive materials.

• Do not install the Hybrid Inverter at a place within children’s reach.

• Do not install the Hybrid Inverter outdoors in salt areas because it will be corroded there and may cause fire. A salt area refers to the region within 500 meters from the coast or prone to sea breeze.

• The Hybrid Inverter must be installed in a well-ventilated environment to ensure good heat dissipation.

• Recommended: Install the Hybrid Inverter in a sheltered place or a place with an awning.

Mounting Requirements

• The mounting structure where the Hybrid Inverter is installed must be fireproof.

• Do not install the Hybrid Inverter on flammable building materials.

• The Hybrid Inverter is heavy. Ensure that the installation surface is solid enough to bear the weight load.

• In residential areas, do not install the Hybrid Inverter on drywalls or walls made of similar materials which have a weak sound insulation performance because the noise generated by the Hybrid Inverter is noticeable.

Space Requirements

• Install the inverter vertically. Never install the inverter horizontally, or at forward/backward tilted, side tilted, or upside down. The forward tilt angle must be less than 15 degrees.

• Reserve enough space around the inverter to ensure sufficient space for installation and heat dissipation:

– Above: ≥ 300mm

– Below: ≥ 500mm

– Left side: ≥ 200mm

– Right side: ≥ 200mm

– Front: ≥ 300mm

Step 1: Mark and drill holes

Place the wall-mounting bracket to 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 position). Mark the hole positions with a marker and drill the holes (Diameter: 8mm, Depth: 45-50mm).

Step 2: Install the mounting bracket

Insert the expansion bolts into the holes. Install the mounting bracket and tighten the bolts to a torque of 5±0.2Nm.

Step 3: Mount the inverter

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

The values in the table are recommended values and can be set to other values according to actual conditions.

Connect the inverter to the equipotential bonding bar by using the protective earth cable (PE) for grounding.

1. Strip 6 mm of insulation from the end of the 4 mm² ground cable. Also prepare a heat-shrink tubing and slide it onto the cable.

2. Crimp the ground terminal (ring terminal) onto the stripped end of the cable using a crimping tool.

3. Slide the heat-shrink tubing over the crimped terminal and use a heat gun to shrink it.

4. Locate the grounding terminal on the side of the inverter. Unscrew the M4 screw, place the ring terminal onto the screw, and then securely fasten the screw back into the terminal. The recommended torque is 1.2±0.2Nm.

The blue connector is for the grid, and the black connector is for backup. The installation and line connection process is the same for both. Follow these steps to install the AC connector:

1. Strip the outer jacket of the AC cable by 30-50mm. Then, strip the insulation from the individual L, N, and PE wires.

2. Insert the stripped wires into the corresponding terminals of the connector plug. Use a screwdriver to tighten the screws to a torque of 1.2±0.2Nm.

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

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

To remove the AC connector, turn it anticlockwise.

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

Creating the Connectors:

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

2. Insert the stripped wire ends into the metal pin contacts.

3. Use a crimping tool to crimp the metal pins onto the wires.

4. Insert the crimped red (+) and black (-) cables into their corresponding positive and negative plastic connector housings until they click into place.

5. Tighten the sealing caps onto the back of the connectors. You can use an MC4 Wrench to ensure they are tight.

Installing the PV Connector:

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

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.

3. Connect the PV connectors to the corresponding PV terminals (PV1+/PV1-, PV2+/PV2-) on the inverter until there is an audible click.

Installing the Battery Connector:

1. Ensure the DC switch is “OFF”.

2. Connect the prepared battery connectors to the corresponding BAT+ and BAT- terminals on the inverter until there is an audible click.

NOTE: Insert the protective caps into any unused DC connections.

The Enable cable, along with the RJ45 cable, is used for communication between the inverter and the Li-ion battery.

Step 1 (optional, if not using a pre-made cable):

• Thread the communication cable (diameter 4.8-6mm) through the waterproof component (nut, seal, body).

• Strip the insulation layer of the cable with an Ethernet wire stripper.

• Insert the stripped communication cable wires 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 already prepared.

Step 2:

• Find the BMS terminal under the inverter.

• Insert the RJ45 plug into the BMS terminal, ensuring it is inserted correctly.

• Tighten the waterproof screw cap securely.

The Meter can be installed in the AC combiner box or other places that are not accessible to children. Connect the smart meter and CT as follows:

1. Connect the L and N wires from the grid to terminals 4(L) and 3(N) on the meter respectively.

2. Connect the L and N wires going to the inverter to the same terminals 4(L) and 3(N).

3. Clamp the Current Transformer (CT) around the main L (Live) wire coming from the grid. Ensure the arrow on the CT points towards the load (inverter/house).

4. Connect the two wires from the CT to terminals 1(L-S1) and 2(L-S2) on the meter.

5. Connect the communication cable between the meter’s terminals 10(A+) and 9(B-) and the inverter’s RS485 communication port.

Meter Terminals Definition:

Smart Meter Parameter Setting: The energy meter is preconfigured. If you need to change settings, follow the button press sequence shown in the manual’s Figure 7-4 to set the ID, Baud rate, and primary current.

Procedure:

1. Locate the Wireless Communications port at the bottom of the inverter.

2. Remove the protective cap from the USB interface.

3. Insert the Wireless stick (WiNet-S module).

4. Tighten the connecting nut to secure the module and ensure a waterproof seal.

Multi-COM Port Definition

RJ45 Terminal Definition

1. Prepare the individual wires by stripping about 12mm of insulation. Crimp the appropriate pin terminals onto the ends of the wires.

2. Disassemble the Multi-COM connector, which consists of a nut, sealing screen, sealing ring, body, and housing.

3. Thread the prepared cables through the nut, sealing screen, and sealing ring. You can cut a small gap in the sealing screen to help thread the cables.

4. Insert the crimped terminals into the correct positions in the connector body according to the pin definition table. You should hear a click when they are properly seated.

5. Assemble the connector by pushing the body into the housing and tightening the nut. A final click will indicate it is locked.

6. To install the Multi-COM connector to the inverter, align it with the COM port on the bottom of the inverter and push it in, then rotate the locking ring clockwise until it is secure.

Ensure that the DC and AC voltages are within the permissible range of the inverter.

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

In order to help guarantee correct long-term operation of the inverter, make sure that 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.

If an earth fault alarm occurs, the error is displayed on the LED indicators, the red light illuminate. For other errors, check the error list below. 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 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. 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 with other household wastes at the end of its service life. Used device must be returned to an official collection point for recycling.