Solinteg M2HT 25⁠–⁠50 kW Hybrid Inverter

06Commissioning53App53Checks Before Start-Up53Start-Up54Shut-Down5507Operation56Indicators, Display and Button56Main Screen58Settings Menu58Reactive Power61Active Power: Volt-Watt (P(U))63Firmware Version, Grid Settings and DRED6308Troubleshooting66Status Codes66Fault Messages6709Maintenance70Inverter Maintenance70Battery Maintenance71Earth Fault Alarm7110Common Questions7211Technical Data73Values That Differ by Model73Values Common to All Models7312Technical Support76AERL Technical Support76

Document

This manual covers the installation, electrical connection, commissioning, operation, maintenance and troubleshooting of the Solinteg M2HT 25–50 kW three-phase high-voltage hybrid inverter (the "inverter" in this manual). It applies to these models:

Who This Manual Is For

This manual is for licensed electrical workers who install and maintain the inverter, and for system owners. Anyone installing, maintaining or troubleshooting the inverter must:

• be trained in installing and commissioning electrical systems, and in managing their hazards
• know this manual and the other system documents
• know the standards and regulations that apply on site. In Australia these include AS/NZS 3000, AS/NZS 4777.1, AS/NZS 4777.2, AS/NZS 5033 and AS/NZS 5139
• hold the licences required in the state or territory where the work is done.

Only people who meet all of these requirements may install, maintain or troubleshoot the inverter.

Safety Symbols

Danger

Indicates a hazard with a high level of risk that, if not avoided, will result in death or serious injury.

Warning

Indicates a hazard with a medium level of risk that, if not avoided, could result in death or serious injury.

Caution

Indicates a hazard with a low level of risk that, if not avoided, could result in minor or moderate injury, or damage to equipment.

Note

Extra information to help you use the equipment. Notes are not safety warnings.

About This Edition

This is AERL's Australian edition of the Solinteg M2HT 25–50K user manual. AERL has rewritten the text for clarity and adapted it for Australia. The product specifications are Solinteg's. Illustrations are for reference only and may differ from your product. Download the latest edition from aerl.com.au.

The warranty for this inverter is set out in the Solinteg M2HT Warranty, available from AERL.

1.1Warranty Exclusions

Read this manual before you transport, store, install, operate or maintain the inverter, and follow its safety instructions and the labels on the equipment. The warranty does not cover damage caused by:

• improper transport, storage, installation or use
• installation or use by unqualified or untrained people
• failure to follow this manual and its safety warnings
• operation in an environment, or outside the limits, set out in this manual and the technical specifications
• unauthorised disassembly or modification of the product or its software, or opening the cover and replacing internal components
• lightning, earthquake, fire, storm or other force majeure events
• installation or operation that does not comply with local standards and regulations
• a product that is outside its warranty period.

1.2Personal Safety

• Only trained, licensed electrical workers may install the inverter.
• Remove watches, bracelets, rings, necklaces and other conductive items before you work on the inverter.
• Never work on live equipment. Sparks and arcs from connecting or disconnecting live cables can cause fire or injury.
• Wear suitable personal protective equipment (PPE).
• Parts of the inverter can exceed 60 °C in operation. Let it cool before touching it.
• Install the inverter where children and animals cannot reach it.

1.3Electrical Safety

• Follow this manual and make all electrical connections in accordance with local regulations.
• Isolate every supply before installation. Never work on live equipment.
• Connect the protective earth before anything else. When removing the inverter, disconnect the earth last.
• Select cables to suit local regulations and this manual. Connect them securely and tighten screws to the specified torque.
• A damaged cable must be replaced by a qualified person.
• Do not open the inverter's front cover. Opening it or replacing internal components may cause injury or damage and will void the warranty.
• Switch off the battery circuit breaker or main switch before working on the battery terminals. The battery is at high voltage.

The M2HT 25–50 kW is a three-phase hybrid (storage) inverter. It connects a PV array, a high-voltage lithium battery, loads and the grid, and manages the power flow between them.

2.1System Overview

The inverter suits TN-S, TN-C, TN-C-S and TT earthing systems. On a TT system, the N-to-PE voltage should be below 30 V. In Australia, the MEN (TN-C-S) system applies.

2.2Appearance

2.3Symbols on the Inverter

2.4Operation Modes

The inverter has six operation modes: General, Peak Shifting, Feed-in, Backup, Time of Use (ToU) and Off-grid. Set the mode on the inverter display, in Solinteg Cloud or in the IntegHub app.

In General, Peak Shifting, Feed-in, Backup and ToU modes, if the grid fails the inverter switches automatically to off-grid operation and supplies the back-up loads, provided the On/Off-grid switch setting is on. The operation mode itself does not change.

General mode

When there is enough PV, it supplies the loads first, then charges the battery, then exports to the grid (PV → loads → battery → grid). You can set export to 0 W where the network does not allow export. When PV is not enough, the battery discharges to the loads, and the grid makes up any shortfall or takes over when the battery reaches its end SOC.

Peak Shifting mode

EXPmax (kVA) is the maximum power you want to import from the grid. PV supplies the loads, then the battery, then the grid. The loads are supplied from PV first, then from the grid up to EXPmax, then from the battery. Surplus PV or grid power charges the battery.

Caution

For Peak Shifting to work, the load above EXPmax must be within the inverter's maximum output power. Otherwise the inverter supplies only its maximum allowed power.

Feed-in mode

When there is enough PV, it supplies the loads first, then exports to the grid, then charges the battery (PV → loads → grid → battery). When PV is not enough, PV and the battery supply the loads together, and the grid makes up any shortfall.

Backup mode

The inverter charges the battery from PV and the grid until it is full, and any surplus supplies the loads. The battery does not discharge while the grid is available. When the grid fails, PV and the battery supply the back-up loads.

Time of Use (ToU) mode

You set a different mode for each time period. The modes available in a ToU period are General, Battery Charge, PV Charging, Peak Shifting, Feed-in and Battery Discharge. General, Peak Shifting and Feed-in work as described above.

• Battery Charge: PV and the grid charge the battery, with an optional charge power limit and end SOC.
• PV Charging: only PV charges the battery, with an optional charge power limit and end SOC.
• Battery Discharge: the battery discharges, with an optional discharge power limit and end SOC.

Off-grid mode

With no grid, PV supplies the back-up loads first and charges the battery with any surplus. When PV is not enough, the battery discharges to supply the back-up loads together with PV.

2.5Back-Up and Off-Grid Use

Danger

The system is not suitable for life-support or other medical equipment. A power outage could be life-threatening.

Warning

Do not use the back-up supply for equipment or precision instruments that may fail or be damaged by an outage or power fluctuation. Before inspecting or maintaining the back-up circuit, switch off the back-up and on-grid breakers to isolate the loads and the inverter completely.

Caution

The inverter is not a conventional UPS. Never connect the back-up output to the grid. The back-up function will not work. In off-grid operation, the inverter stops the back-up supply when there is no energy available from PV or the battery.

A single inverter normally switches between on-grid and off-grid within 10 ms, but external factors can stop it switching. When using the back-up function:

1. Do not connect loads that need an uninterrupted supply to work reliably.
2. Do not connect more load than the back-up output can supply.
3. The battery current may be limited by temperature and other conditions.
4. Off-grid, the load's continuous power and its starting (inrush) current must both be within the inverter's off-grid capability. Avoid starting the following loads at the same time:

The back-up / off-grid peak output is 1.5 × rated output power for 10 seconds on all models. If the overload protection operates, the inverter restarts. Repeated overloads lengthen the restart time, up to 2 minutes. Reduce the back-up load or remove loads with very high starting current.

2.6Power Derating

The inverter reduces its output to protect itself, or as the grid requires, in conditions including:

• high ambient or internal temperature (derating usually starts above 45 °C ambient)
• high altitude
• grid overvoltage
• grid over-frequency.

3.1Transport and Handling

• Follow the caution labels on the packaging.
• The inverter weighs 89 kg (99 kg packed). Lift it with enough people to meet local manual-handling requirements: at least two, one on each side, holding the handles.
• Transport it in its original box.
• Wear protective gloves. When lifting, hold the handles and the base of the inverter, and keep it level so it cannot fall.

3.2Packing List

The inverter is tested and inspected before shipping, but can still be damaged in transit. Inspect it on delivery. If anything is damaged or missing, contact AERL or the carrier and send photos.

3.3Storage

• Store the inverter in its original packaging, indoors, out of the rain.
• Do not place heavy objects on it, or stack more than three layers.
• Storage temperature −30 to 60 °C; humidity below 90%.

4.1Location

• The enclosure is IP66, suitable for indoor and outdoor installation.
• Mount the inverter on a wall that can carry its weight (89 kg). Do not mount it on plasterboard or other walls with poor sound insulation.
• Install it at eye level for easy reading of the display and for maintenance, out of reach of children.
• Install it in a well-ventilated location, at −30 to 60 °C and 0–100% humidity, and no higher than 3000 m.
• Protect it from direct sun, rain and snow, for example with an awning.

Warning

Do not keep flammable or explosive materials near the inverter.

Clearances

Leave enough clearance around the inverter for cooling.

Mounting angle

Install the inverter vertically. Never install it horizontally, tilted forwards or backwards, or upside down.

4.2Tools

Wear PPE when installing. You will need an electric drill, electric screwdriver, hammer, Phillips screwdriver, tape measure, marker, spirit level, insulated gloves and safety glasses.

4.3Moving the Inverter

1. Take the inverter out of its box and move it to the installation position.
2. Fit the lifting handles through the 12 mm holes on each side, and carry the inverter by the handles.

3. To lift it onto the bracket, move the lower handles to the lower lifting position.
4. If the installation position is high, hoist the inverter with lifting gear through the 12 mm holes.

4.4Mounting the Inverter

1. Assemble the bracket, level it with a spirit level and mark the drilling positions (830 mm and 45 mm spacings, 130 mm as shown). Drill the holes with a hammer drill.
2. Fix the bracket to the wall with the bolts.
3. Lift the inverter and hang it on the bracket. Secure it with the M6 screws.

4.5Earthing

Connect the inverter to the earth bar with a PE conductor. Always connect the PE conductor before any other cable.

Danger

Never use the neutral as the protective earth for the inverter enclosure. Doing so can cause electric shock.

Caution

A reliable earth improves surge immunity and EMC performance. In a multi-inverter system, connect every inverter's PE conductor to the same earth bar for equipotential bonding.

1. The external earth terminal is at the lower right of the inverter.
2. Crimp an OT lug onto the PE conductor, and fix it to the inverter's earth stud. Connect the other end to the earth bar.

5.1Safety

Danger

Make sure the AC and DC sides are fully isolated before working on the inverter. In sunlight, the PV array produces dangerous DC voltage. Follow these instructions exactly. The PV string voltage must never exceed the inverter's maximum DC input voltage. Damage caused by PV overvoltage is not covered by the warranty. Never use the neutral as the protective earth for the inverter enclosure.

Warning

Never earth the positive or negative pole of a PV string. This will seriously damage the inverter. The inverter is not suitable for functionally earthed PV arrays as described in AS/NZS 5033. Static electricity can damage the electronics. Take anti-static precautions during installation and maintenance.

Caution

Use only the terminals supplied in the accessory kit. Damage caused by other terminals is not covered. Tighten every cable gland securely. Damage from water or dust entering through a poorly fitted connector voids the warranty. If the back-up load is too large, the inverter protects itself and stops its AC output. Remove some of the load and restart the inverter.

5.2Wiring Diagrams

The diagrams show the structure of a system with the RMM smart meter. Install and wire every system in accordance with local standards.

Australia and New Zealand

In Australia and New Zealand, the neutral must not be isolated or switched, and the neutrals of the grid side and the back-up side must be connected together in accordance with AS/NZS 3000. Otherwise the back-up function will not work.

Breakers and RCDs

The inverter has built-in residual current monitoring and disconnects from the grid if the fault current exceeds its limit. If an external RCD is required, use type A. The table gives recommendations; select devices to suit the site and local regulations.

Breaker 4 (main switchboard) is sized to suit the site loads and inverter capacity, and breaker 5 to suit the normal loads. Short-circuit values are to IEC 62477.

N-PE check

Some countries require the back-up neutral to be earthed when the inverter operates off-grid. With the N-PE Check setting on, the inverter links N to PE in off-grid operation and disconnects the link in on-grid operation. In Australia, the MEN link in the switchboard normally provides this. Set N-PE Check to suit the installation design.

5.3Tools and Materials

You need the inverter accessory kit, and wire strippers, side cutters, crimping tools (including an RJ45 crimper), a multimeter with a DC range above 1100 V, screwdrivers and an Allen socket wrench. Supply AC, DC, communication and earth cables to suit the site.

5.4AC Connection

Warning

Isolate every AC and DC supply before connecting the AC cables. Connect the phases in the correct order, as marked on the AC connectors.

Note

Each of the on-grid and back-up outputs needs its own AC breaker. Do not connect loads directly to the inverter. Fit RCDs on the AC side as local regulations require. The inverter suits three-phase grids of 380/400/415 V, 50/60 Hz. Connect to the grid only with the approval of the local network service provider.

Cables

Before you wire the AC side

High voltage may be present in the inverter. Check that every cable is dead before connecting it, and do not switch on any AC breaker until all connections are complete.

On-grid AC cable

1. The recommended cable diameter is 20–24 mm. Remove seal insert parts to suit a larger cable: above 24.5 mm remove part 1; above 28.5 mm also remove part 2; above 32.5 mm also remove part 3.
2. Strip 95–100 mm of the outer sheath, and 20–25 mm of insulation from each L1, L2, L3, N and PE core. We recommend cutting the phase cores 15 mm shorter than N and PE.

3. Thread the cable through the locknut, seal and housing, in that order.
4. Crimp the OT lugs onto the cores.
5. Remove the nuts, fit the L1, L2 and L3 lugs in order and tighten to 3.8 ± 0.1 N·m.

6. Fit the insulating spacer into its hole in the connector insert.
7. Fit the N/PE insulating spacer into its hole.
8. Fit the N and PE lugs and tighten to 3.8 ± 0.1 N·m.

9. Push the housing onto the connector insert and tighten the Phillips screws.
10. Tighten the nut with an open-ended spanner to 10.0 ± 0.1 N·m.

Back-up and generator AC cables

Note

Do not confuse the back-up and generator cables when connecting them to the inverter.

1. Remove the plug from the AC terminal.
2. The recommended cable diameter is 20–24 mm. If it is larger than 24 mm, remove part 1 of the seal insert.
3. Strip 95–100 mm of the outer sheath, and 15 mm of insulation from each core.

4. Thread the cable through the locknut and housing. Fit bootlace ferrules to multi-strand cores.
5. Insert the cores into the connector insert in the marked order, checking through the sight hole that each is fully in. Tighten the terminal screws to 5 ± 0.1 N·m.

Warning

Make sure the ferrules are clamped tightly, so they cannot loosen over time.

6. Push the housing onto the insert until it clicks, then tighten the nut with an open-ended spanner to 10.0 ± 0.1 N·m.

5.5PV Connection

Danger

In sunlight, the PV array produces dangerous DC voltage.

Warning

Check the polarity of each string before connecting it. The maximum operating PV input voltage is 950 V. Between 950 V and 1000 V the inverter goes to standby. Above 1000 V the inverter will be damaged. Make sure the PV connectors are fully mated, to prevent overheating or arcing.

Note

The modules on one MPPT should be the same brand and model, at the same tilt and orientation, with the same string voltage. Otherwise energy yield may be reduced.

Cables and DC isolation

Where an external DC isolator is required, it must be certified to AS 60947.3:2018 and AS/NZS IEC 60947.1:2020 in Australia and New Zealand. Select it to suit the inverter's maximum DC short-circuit current (50 A per MPPT).

Assembling the PV connectors

1. Strip 7 mm of insulation from the DC cable.
2. Take the PV connectors apart.
3. Push the cable through the connector nut into the metal contact, and crimp it with a suitable tool (Phoenix CRIMPFOX-RC 10 recommended). Tug the cable to check the crimp.
4. Push the contacts into the positive and negative connector housings until they lock. Tug the cable to check.
5. Tighten the nut fully with an open-ended spanner to seal the connector.

Connecting the PV strings

1. Turn the DC switch to OFF.
2. Check the polarity and open-circuit voltage of each string. It must not exceed 950 V.
3. Plug the positive and negative connectors into the inverter's DC inputs until they click.
4. Fit caps to unused PV inputs.

5.6Battery Connection

This section covers the inverter side only. For the battery side, follow the battery manufacturer's instructions.

Warning

Before connecting the battery, switch off the AC breakers and the battery breaker, and turn the inverter DC switch to OFF. Check the polarity before connecting.

Caution

The maximum battery voltage is 840 V. Measure the battery voltage before connecting it, and never connect a battery above 840 V. Fit fuses in both the positive and negative battery conductors.

Note

The inverter cannot operate off-grid without a battery. The inverter works only with batteries on Solinteg's compatibility list: high-voltage LFP batteries with a BMS. See the AERL Compatibility Guide (aerl.com.au).

1. Strip 16.5 mm of insulation from the battery cable.
2. Take the battery connector apart.

3. Push the cable into the metal contact and crimp it with a hydraulic crimping tool. Tug the cable to check the crimp.
4. Tighten the nut fully with an open-ended spanner to seal the connector.
5. Plug the positive and negative connectors into the inverter's battery terminals until they click.
6. To unplug a connector, press its release with a screwdriver, then pull it out.

The battery communication cable is covered in section 5.9.

5.7Smart Meter and CTs

The system needs the Solinteg RMM smart meter and CTs for load monitoring, export limiting and power management. Both are supplied with the inverter, with the CTs pre-wired to the meter; do not disconnect them. The CT leads are 2 m long.

Install the meter in the switchboard or another suitable location out of reach of children. Fit the CTs on the phase conductors between the grid and the on-grid loads, with the arrows pointing from the loads to the grid.

Note

Use only smart meters compatible with Solinteg systems. Fit a circuit breaker in the meter's AC supply. Install each CT with its arrow pointing from the loads to the grid.

Choose the CT to suit the load and the inverter rating when ordering. The RMM-5A meter needs separately purchased 5 A CTs; see its manual.

5.8Communication Module

The inverter works only with the Solinteg R2MD communication module, supplied in the accessory box.

1. Unscrew and remove the cover from the COM1 port at the bottom of the inverter.
2. Push the R2MD fully into the COM1 USB socket, and turn the nut until it clicks.

5.9Communication Ports

The inverter communicates with other devices through the COM2 and COM3 multi-function connectors.

Notice

COM2 and COM3 look alike. COM3 is blue.

Assembling the connector

1. Unscrew the swivel nut from the connector.
2. Press the release and take out the terminal block.
3. Remove the seal and pass the cable through the gland.

Terminal block wiring

1. Pass the cable through the swivel nut and housing. Strip 55 mm of sheath and 8 mm of insulation. Cores 0.5–1.5 mm².
2. For multi-strand cores, twist each core by hand and fit a pin ferrule. Skip this for solid cores.

3. Connect each core to its terminal and tighten to 1.2 ± 0.1 N·m.
4. Tug each core to check it, then push the terminal block into the connector until it clicks.

RJ45 wiring

1. Crimp an RJ45 plug onto the cable.
2. Pass the plug through the swivel nut and into the open side of the rubber seal, and plug it into the RJ45 socket on the terminal block.

3. Connect the other end to the external device, then plug the COM2 and COM3 connectors into their ports on the inverter.

Meter communication

The inverter communicates with the RMM meter over RS485 through the METER RJ45 port (pins 7 and 8). The cable is supplied.

Battery communication

The inverter communicates with the battery BMS over CAN through the BMS 1 RJ45 port (pin 4 CANH, pin 5 CANL). BMS 2 is not used.

Caution

Do not earth unused battery communication cores or connect them to other equipment.

EV charger communication

The inverter communicates with a Solinteg ECA-series EV charger over RS485 (COM3 pins 17 and 18). Earth the charger properly, or communication will be affected.

Demand response (DRED)

The inverter supports the demand response modes of AS/NZS 4777.2 through a demand response enabling device (DRED), connected to COM2 pins 1–6. The DRED is not supplied. DRED and ripple control cannot be used at the same time.

Note

When using DRED, set the DRED RES detection resistor switch to OFF, and set DI Ctrl to DRM (section 7.6). The ripple control (RCR) and German §14a functions described in Solinteg's manual are not used in Australia.

Emergency stop

An external emergency stop switch (not supplied) can be connected to COM2 pins 15 and 16. When it operates, the inverter stops its AC output. Set the contact type (NO or NC) on the inverter display.

Load control

With Solinteg's additional control device, the inverter can control loads, including SG Ready heat pumps. Contact AERL for details. The DO dry contacts are rated at 30 V DC, 1 A maximum.

5.10Parallel Systems

See the Solinteg M2HT 25–50 kW Paralleling & Generator Guide, and contact AERL when designing a multi-inverter system.

A parallel system must meet these conditions:

1. All inverters must be the same model and rating.
2. One inverter is the master and the others are slaves, set on the display or the monitoring platform.
3. The master communicates with the smart meter over RS485. The inverters communicate with each other over CAN.
4. Every inverter needs its own communication module.
5. Breakers must be fitted on every inverter's on-grid and back-up outputs.
6. The SYNC 120R and PAR CAN 120R termination switches must be ON at the first and last inverters.
7. On/off-grid parallel also needs the Solinteg EDA back-up box, controlled by the master through its DO port.

The figure shows what must not be done: one PV string to several inverters; one meter to several inverters, or several CTs on the same conductor; one battery bank to several inverters; the back-up side directly to a generator; or the back-up side to the on-grid side or the grid.

6.1App

Install the latest Solinteg IntegHub app and register an account, or use the account details from your installer or AERL. The app also configures the inverter locally over Bluetooth.

Get the IntegHub app

Android

Google Play

iPhone

App Store

Web monitoring: www.solinteg-cloud.com

6.2Checks Before Start-Up

1. All equipment is securely installed.
2. The DC switch and AC breakers are OFF.
3. The earth, AC, DC and communication cables are correctly and securely connected.
4. Unused terminals are sealed.
5. No tools or other objects are left on the inverter or in the switchboard.
6. The AC breakers meet this manual and local standards.
7. All warning labels are in place and legible.

6.3Start-Up

1. Switch on the AC breaker.
2. Switch on the battery, and power up the battery pack if required.
3. Turn on the DC switch (built into the inverter, or external). Wait 5 minutes.
4. The inverter starts when the PV and grid meet its start-up conditions. Connecting to the grid can take several minutes, depending on the safety code and the grid.
5. Check the indicators to confirm the inverter is operating normally.
6. Set up the network connection and other settings in the IntegHub app (see the R2MD quick installation guide).

If the inverter does not start

Check the safety code: select the AS/NZS 4777.2 region setting required by your network service provider. Check the battery ID matches the battery fitted.

CT auto test

The inverter can check the CT direction and phase sequence. Run the test from the app once the system is installed.

SOC reset

With SOC Reset on, the inverter charges the battery fully to calibrate its SOC, then turns the function off. We recommend a calibration at commissioning and periodically after that.

6.4Shut-Down

1. Stop the inverter from the app or the display.
2. Switch off the grid and load breakers.
3. Switch off the battery and the battery-side DC breaker, if fitted.
4. Wait 30 seconds, then turn the inverter DC switch OFF. The capacitors stay charged: wait 10 minutes before working on the inverter.

To restart, switch on the AC breaker, battery breaker, battery and DC switch, in that order. If the inverter is to be out of service, a licensed electrical worker should disconnect the AC and DC cables.

7.1Indicators, Display and Button

The main screen shows (1) the inverter information, status and settings, (2) battery SOC, (3) the communication method, (4) the status code (section 8.1), (5) generator running and (6) EV charger connected.

7.2Main Screen

The main screen cycles through the inverter status (Waiting, Checking, On-Grid, Off-Grid, Fault Info, FW Updating), PV values for each MPPT and battery values for each battery input.

7.3Settings Menu

System Info shows the firmware version, serial number, slave firmware versions and check code. General Set shows Wi-Fi signal strength and sets the IP address (LAN, DHCP off), Modbus address, clock and display language. After changing a setting, select Yes to save or No to cancel.

Advanced Set is password protected. Contact AERL support for the password. Its main settings are:

Customize Set holds settings for special cases. Change them only on AERL's advice:

7.4Reactive Power

The inverter can regulate reactive power. The modes are enabled through the configuration software, and some are on by default for Australia. Contact AERL to change the defaults.

7.5Active Power: Volt-Watt (P(U))

The output power reduces as the grid voltage rises. P(U) is the volt-watt power quality response mode of AS/NZS 4777.2 and is on by default for Australia.

7.6Firmware Version, Grid Settings and DRED

Firmware version: Main Screen → System Info → FW Version.

Grid settings in Solinteg Cloud: you can check and adjust the safety code, protection settings, reactive power modes and P(U) through the monitoring platform.

1. In Devices → Device list, click Configure for the inverter.
2. Under Basic parameters, check Safety code settings.
3. Under Grid Connection Parameter, check the Protection Parameters and Grid Connection Parameter settings.
4. Under Reactive power control, check Reactive mode.
5. Under Voltage related active power P(U), check the P(U) settings.
6. After changing settings, click Set and enter the password.

Caution

Changing the safety code, protection settings, or reactive or active power modes needs a password. Once set at commissioning, these settings are locked. Contact AERL support for the password.

DRED: on the display, open Advanced Settings, enter the password and set DI Ctrl to DRM.

8.1Status Codes

8.2Fault Messages

When a fault occurs, the display shows a message and the inverter may stop exporting. Where the table says to contact support, call AERL on 1800 950 865 or email [email protected].

9.1Inverter Maintenance

Before any maintenance

1. Stop the inverter from the display or the app.
2. Switch off all AC breakers.
3. Turn the inverter DC switch OFF.
4. Switch off the battery and the battery-side DC breaker, if fitted.
5. Wait 10 minutes for the capacitors to discharge.
6. Check that all indicators are off.

Warning

Keep unauthorised people away, with a temporary sign or barrier, during electrical work and maintenance. In bypass, the grid supplies the loads directly. Do not work on the DC side in bypass: stop the inverter and turn the DC switch off first.

Caution

Do not replace internal components. Contact AERL for service.

9.2Battery Maintenance

Battery installation and maintenance must be done or supervised by people competent with batteries. Follow the battery supplier's instructions.

Warning

Never put a battery in a fire: it may explode. Never open or break a battery: the electrolyte is harmful. Remove metal items, use insulated tools, and switch off the battery DC breaker before connecting or disconnecting battery terminals. If the battery is unintentionally earthed, remove the earth connection before working on it.

9.3Earth Fault Alarm

If the PV array develops an earth fault, the inverter alarms until the fault is cleared, as AS/NZS 5033 requires:

• the red indicator stays on, and the display shows ISO Over Limitation or GFCI Fault
• Solinteg Cloud and the IntegHub app show a warning, which can also be sent by email.

Caution

Install the inverter where the alarm indicator will be noticed, or set up email alerts.

Is there back-up output without a battery?

Yes, while the grid is present. No, when the grid is down: off-grid operation needs a battery.

Can the inverter be used off-grid?

Yes, provided a battery is connected.

Can low-voltage batteries be connected?

No. Only high-voltage lithium (LFP) batteries compatible with the M2HT 25–50K can be connected.

Can high-current PV modules be connected?

Yes. Each PV string input accepts up to 20 A, so modules of 18 A or more can be used.

Does the inverter have overload capability?

On-grid, set MaxOutputSet to Overload for 1.1 × rated output. Off-grid, the back-up peak output is 1.5 × rated output for 10 seconds.

11.1Values That Differ by Model

Model names are M2HT-xxK-150.

11.2Values Common to All Models

* Maximum operating PV voltage is 950 V. Between 950 V and 1000 V the inverter stops operating. Above 1000 V the inverter will be damaged.

** Maximum power imported from the grid to supply the back-up loads and charge the battery.

Contact AERL for help with installation, commissioning, settings passwords, faults, firmware, warranty and spare parts for the M2HT 25–50 kW in Australia.

When you contact AERL, have the following ready:

• the inverter model and serial number
• the installation date
• the fault code or message, and when it occurred
• a short description of the problem and what you have already checked.