MIDEA M1-S3.68K (01) PDF MANUAL

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 according to the information contained in the manual. 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. Ensure sufficient ventilation for air circulation to cool the inverter.

Electrical Connection:

• 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!

• 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:

• 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.

• Contact with the electrical grid or the device’s terminals may result in an electric shock or fire.

• While the inverter is being operated, several internal components will become very hot. Please wear protective gloves and keep children away.

Repair and Maintenance:

Should any repairs be required, please contact a local authorized service center. The internal components of the inverter must NOT be opened without the relevant authorization.

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 the reserved SOC value, the battery can only be charged, until SOC reaches the reserved value, the battery will be stopped charging. When SOC is larger than the SOC setting value, the 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 the charging period, the battery can only be charged, while in the discharging period, the battery can only be discharged. The rest of the period, the battery will behave as Self-use mode.

Mode5: Peak shaving

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

NOTE:

• If there is no power from PV, The inverter will take power from the grid first, so it is normal that you will find 20-50W power from the grid when the inverter is on standby mode.

• The battery discharges to provide energy to loads. If the battery is empty or there is not enough power from the battery system, the grid shall supply power to backup loads and normal loads.

• If the smart meter is abnormal or not equipped, the inverter will run normally, however, the battery can be charged but not allowed to discharge. In this case the feed-in limitation setting will be inactive.

1. For hybrid inverters, 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, external factors may cause the system to fail on Back-Up mode. Follow these instructions:

• 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, such as nonfrequency conversion air conditioning, vacuum cleaner, or half-wave loads like a hair dryer or hammer drill. Refer to the recommended loads table.

• Due to the condition of the battery itself, battery current might be limited by factors like 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 close 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 the maximum limitation or remove the loads which may cause very high start-up current surges.

Note: The 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.

The maximum allowable charge/discharge current is limited by the smaller value among: 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 command 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.

Contact After-sales service provider or the transport company in case of any damage or incompleteness, and provide photos to facilitate services. 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.

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.

Angle Requirements:

Install the inverter vertically. Never install the inverter horizontally, or at forward/backward tilted (max 15° forward), side tilted, or upside down.

Space Requirements:

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

• Clearance above: ≥ 300mm

• Clearance below: ≥ 500mm

• Clearance on left side: ≥ 200mm

• Clearance on right side: ≥ 200mm

Step 1. Place the wall-mounting bracket to a proper position on the wall. Use the spirit level on the bracket to ensure it is level (bubble in the middle). Mark the hole positions with a marker and drill the holes (Ø8, 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 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 1.2±0.2Nm.

DANGER – Electrical voltage at the DC connections:

• Ensure that the DC switch is OFF before establishing the electrical connection. The reason is that the electrical charge remains in the capacitor after the DC switch has been switched off. Therefore, at least 5 minutes must lapse before the capacitor has been electrically discharged.

DANGER – Electrical voltage:

• PV modules generate electrical energy when exposed to sunlight, and this may present an electrical shock hazard. Therefore, cover the PV modules with an opaque sheet before connecting to the DC input power cable.

DANGER – Electrical voltage at the DC connections:

• Wear rubber gloves and protective clothing (safety goggles and boots) when working on high voltage/high current systems such as inverter and battery systems.

ATTENTION – Qualification:

• The installation and maintenance of the inverter must be carried out by an electrician.

NOTE:

• The open-circuit voltage of the modules connected in series must be lower than or equal to 600 V.

• The connected PV modules must be compliant with IEC 61730 class A.

ATTENTIONS:

• If local standards 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: As the inverter is transformerless, the plus and minus poles of the PV generator must NOT be earthed. Otherwise, the inverter will malfunction.

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

2. Crimp a ring terminal onto the stripped end of the cable. Place heat-shrink tubing over the connection.

3. Use a crimping tool to secure the terminal.

4. Connect the ground cable’s ring terminal to the grounding point on the side of the inverter using an M4 screw. Tighten to 1.2±0.2Nm.

The AC power cables connect the inverter to the critical loads (AC-BACKUP port) and the AC power distributor or power grid (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.

1. Strip the outer jacket of the AC cable (30-50 mm). Strip the insulation from the L, N, and PE wires.

2. Insert the wires into the corresponding terminals of the connector housing (L-Brown, N-Blue, PE-Yellow-Green) and tighten the screws to 1.2±0.2Nm.

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

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

To remove: Turn the AC connector anticlockwise.

NOTE: 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 and colors are different. The battery terminal is blue, and the PV terminal is black.

Installing the PV/Battery Connectors:

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

2. Insert the stripped ends into the metal pins of the DC connector.

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

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

5. Tighten the end caps onto the connector housings.

Installing the PV/Battery Connector to the Inverter:

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

2. Check the cable connection of the PV string for polarity correctness and ensure the open circuit voltage does not exceed the inverter input limit of 600V.

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

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

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

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

• Thread the communication cable (Ø4.8-6mm) through the waterproof component.

• 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.

• Before installing the connector, tighten the waterproof cover.

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.

The Smart Meter can be installed in an AC combiner box or other places inaccessible to children. The Current Transformer (CT) is usually installed on the L wire between the house loads and the power grid.

Follow the electrical diagram provided in the manual to connect the smart meter and CT. The meter terminals are defined as follows:

The energy meter is preconfigured. To change or check settings, use the button on the meter:

• Set ID: Long-press to enter setting mode. Tap to cycle through values. Long-press to confirm.

• Set Baud rate: From the ID screen, tap to move to the Baud rate setting. Long-press to enter setting mode. Tap to cycle through values. Long-press to confirm.

• Set primary current: From the Baud rate screen, tap to move to the primary current setting. Long-press to enter setting mode. Tap to cycle through values. Long-press to confirm.

The screen will stop flickering when the setting is successfully saved.

1. Remove the protective cap from the USB interface (labeled WiNet-S or similar).

2. Install the Wireless stick into the USB port.

3. Tighten the connecting nut to secure the module.

Multi-COM Port Definition

Before powering on, check 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 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 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, or cleaning agents.

Cleaning the heat sink:

To help guarantee correct long-term operation of the inverter, 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, or cleaning agents.

First, check the warnings, error messages, or error codes displayed on the screen of the app. If no error information is displayed, 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 communication cables correctly connected and undamaged?

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 should not be disposed of with other household wastes. Used devices must be returned to an official collection point for recycling.