Elecod Monet-AC - grid-support inverter

Introduction

This document describes the integration between the Elecod Monet-AC series battery power conversion system (PCS) and the myPower24 online monitoring platform using the LoggerV data logger, for real-time monitoring, data logging, and plant control.

Phase A - Selection & Compatibility

1. Models covered

• Monet-100AC (IP65): Elecod (Shenzhen Elecod Electric Co. Ltd.); 100 kW rated, 110 kW maximum.

• Monet-125AC (IP65): Elecod; 125 kW rated, 137.5 kW maximum.

• Monet-130AC (IP65): Elecod; 130 kW rated, 143 kW maximum.

• Product type: Grid-Support Inverter. All three are three-phase bidirectional battery converters with a battery on the DC port and no PV input, rated 400 Vac on a 3W+PE or 3W+N+PE connection at 50 or 60 Hz.

2. Communication & compatibility

• Modbus TCP (Ethernet): Ethernet transport with an active Modbus scan, on port 502. LoggerV compatible: yes. This is the only transport used for Monet-AC integrations.

• Firmware: device minimum Not Specified; LoggerV minimum Not Specified.

<div class="kb-callout kb-callout-note"><p>Use the <strong>LAN</strong> port on the PCS communication secondary port (J1). The module also has serial ports on the same connector, but <strong>Modbus TCP over the LAN port is the only transport supported for this integration</strong> and there is no serial fallback, so treat the Ethernet path as a commissioning requirement rather than a choice.</p></div>

3. Plant-control capability

• PCS (Power Conversion System): the LoggerV dispatches active power to the converter. It writes the active-power setpoint on every control cycle with no deadband, reads back what the converter is actually holding, and reports that to plant control. On an orderly LoggerV shutdown it commands 0 kW so the converter does not keep serving a stale setpoint.

• Reactive power and power-factor setpoints exist as manual settings on the device page, but plant control does not dispatch them.

• Off-grid transfer is not dispatched. The converter has an on-grid / off-grid switch and its own grid-forming modes, but the LoggerV does not command islanding.

• Monitoring in plant control covers active, reactive and apparent power, imported and exported energy, the operating mode, and whether AC is available.

<div class="kb-callout kb-callout-warning"><p>Active-power dispatch is only honoured while the converter's <strong>Grid-connected Control Mode</strong> is set to <strong>PQ</strong>. In MPPT, CV or VSG the setpoint write succeeds but the converter ignores it, so the unit silently never follows the dispatch.</p></div>

4. Recorded data points

• Phase A Voltage, V, raw.

• Phase B Voltage, V, raw.

• Phase C Voltage, V, raw.

• Phase A Current, A, average.

• Phase B Current, A, average.

• Phase C Current, A, average.

• Phase A Frequency, Hz, raw.

• Phase B Frequency, Hz, raw.

• Phase C Frequency, Hz, raw.

• Total Active Power, W, average.

• Total Reactive Power, var, average.

• Total Apparent Power, VA, average.

• DC Voltage, V, average.

• DC Current, A, average.

• Busbar Voltage, V, average.

• Positive-to-Ground Impedance, Ohm, min/max.

• Negative-to-Ground Impedance, Ohm, min/max.

• Leakage Current, A, min/max.

• Power Tube Temperature, °C, average with min/max.

• Balance Bridge Temperature, °C, average with min/max.

• Ambient Temperature, °C, average with min/max.

The sampling period is device-wide, so there is no per-point interval. Battery state of charge is read from the converter and shown live, but it is not recorded here: battery history is recorded from the battery itself. The lifetime charge and discharge energy counters are also not recorded, because plant control already keeps the energy totals.

5. Reference documents

Three documents are the sources for this page and are held by the SolarMD team. None is hosted in the knowledge base yet; all can be uploaded on request.

• Monet-125AC (IP65) specification sheet, dated 2025-11-26. The source for the electrical ratings, the DC voltage windows used for battery sizing in section 8, port pinouts, terminal order and indicator-light meanings.

• Elecod eleHost Instruction Manual V0.0.3. The source for the commissioning procedure in sections 7 and 8. It also covers the parts of eleHost this page does not: firmware upgrade and protocol switching under the Debug menu, and reading, exporting and clearing the module's stored historical faults.

• Solar MD High Voltage Range SS70xx datasheet, July 2025. The source for the battery stack voltages, capacities and module counts used in section 8.

Phase B - Installation & Commissioning

6. Wiring & connection

Connection diagrams are generated by the platform's Add-Device wizard; see How to add a device in myPower24.

Device-specific notes:

• Communication ports are all on the PCS communication secondary port (J1) on the front of the module. The LAN port is the Ethernet port, and it is the one the LoggerV uses. COM2 is the battery BMS CAN port (CANH_BAT on pin 1, CANL_BAT on pin 2), and the lead to the battery is a crossover, not straight through; see section 8. COM1-A, COM1-B and COM3 carry the module's serial interfaces and are not used for this integration, except that COM3 also carries the dry-contact inputs and outputs on pins 3 to 8, rated 24 VDC and 800 mA, with passive dry-contact inputs. COM1-A and COM1-B also provide a 12 V 1 A supply on pins 4 and 5.

• AC power terminal (J4), left to right: N, A, B, C. The grid phase sequence must match, or the converter raises a wrong-phase grid fault.

• DC power terminal (J3): the orange terminal is DC+ and the black terminal is DC-. Reversed polarity presents as a low DC voltage fault, not as an obvious wiring error.

• Ground is the J5 port. J2 is the module paralleling port and is not used for monitoring.

• The converter has no local display. All device-side configuration is done from a PC over Ethernet using the vendor's eleHost software, as described in section 7. The eleHost manual documents no password for connecting to a module.

• The module ships on a default address of 192.168.1.50, port 502. Expect to change it to suit the site network before the LoggerV can reach it.

7. Configuration steps

The converter's own network and battery settings are configured from a PC using the vendor's eleHost software before the LoggerV can reach the unit. The LoggerV deliberately does not write the converter's network registers.

1. Connect the comms cable per the generated diagram.

2. Put your PC on the module's LAN. The module ships on 192.168.1.50, port 502. Open the Windows network adapters (WIN+R, then ncpa.cpl), open the properties of the adapter connected to the module, select IPv4 and set a static address on the same subnet, for example 192.168.1.5 with gateway 192.168.1.1.

3. Connect to the module in eleHost. Set the communication type to ModbusTcp on the Communication menu, then on the Device screen click Connect New Device, enter the module IP address and port, and click Connect. The module joins the device list and its details appear. A module that drops off can be reconnected from the offline device list.

4. Set the converter's network settings so the LoggerV can reach it. Go to Setting, choose Communication Parameter in the Protocol List, and set IP1 to IP4, Port (502), Subnet Mask1 to Subnet Mask4 and Gateway1 to Gateway4. Each octet is a separate field. The Module Information panel on the left shows the resulting address, and ARM Ver confirms the firmware version.

5. Write the settings to the module. Changes in the parameter grid are not live until you load them: use Load Parameters in the upper left and select the module. To read back what the module currently holds, use the mode switch in the upper left to change to read mode and select the module again. Export Para and Import Para save and restore the whole parameter set as a .CSV file, which is the quickest way to replicate a commissioned configuration onto another module.

6. Add the device on the LoggerV; see How to add a device in myPower24.

7. Enter the serial number by hand when adding the device. This converter exposes no serial number register, so the LoggerV cannot read it; use the serial from the unit label. It becomes the device's permanent identity on the platform.

8. Open the Info tab on the device page and check Rated Power on the Nameplate card against the physical unit nameplate. Correct it before enabling plant control. See the warning below.

9. Set Grid-connected Control Mode to PQ, or plant control dispatch will have no effect.

10. Configure the battery protection settings and the BMS link, as described in section 8.

The Communication Fault Delay Time on the same Communication Parameter screen is the converter's own comms timeout, in seconds. The LoggerV does not arm or use it, so whatever it is set to is the converter's own behaviour, not the platform's. See the watchdog note in section 12.

<div class="kb-callout kb-callout-danger"><p><strong>Rated Power must match the physical nameplate exactly.</strong> The converter scales a power command against its own internal hardware rating, while the LoggerV converts the plant-control demand into that percentage using the Rated Power setting. If the two disagree, every dispatch is scaled wrongly and nothing else shows a symptom. On a 125 kW unit left set to 50 kW, a 50 kW request becomes a 100 percent command and the converter delivers 125 kW, two and a half times the request, while plant control believes the unit is at its ceiling.</p></div>

The LoggerV helps you catch this. The Rated Power field only accepts 100 kW to 130 kW, the documented range for this series; a value outside that range colours amber on the Info tab and raises a warning alert on the device. Check Authorized Capacity on the same card too: where the firmware licence is below the hardware rating, the licence is the real ceiling.

Phase C - Battery communication

8. Battery compatibility & configuration

The Monet-AC talks to the battery BMS over CAN on the COM2 port (CANH_BAT on pin 1, CANL_BAT on pin 2). The specification sheet states the converter suits 52s packs.

It is compatible with the Solar MD H17 BMU, which is the BMU used across the Solar MD high-voltage SS70xx range.

Which SS70xx sizes suit this converter. The Monet-AC is a fixed-voltage battery port, not an MPPT input, so the battery stack's whole operating window has to sit inside the converter's DC window. The converter has two: it operates from 580 V to 1000 V, but only delivers full rated power from 625 V to 950 V, both figures for a 3W+PE connection. A stack that drops below 625 V at low state of charge still runs, it just cannot reach full power down there; a stack that drops below 580 V trips the converter on DC undervoltage. Matching that against the SS70xx operating voltages:

• SS7022-05 (14 modules, 224 kWh, 112 kW): 660.8 V to 778.4 V. Inside the full-power window across the whole range.

• SS7024-05 (15 modules, 240 kWh, 120 kW): 708 V to 834 V. Inside the full-power window across the whole range.

• SS7026-05 (16 modules, 256 kWh, 128 kW): 755.2 V to 889.6 V. Inside the full-power window, and the first size whose 0.5C power rating covers the converter's full 125 kW.

• SS7027-05 (17 modules, 272 kWh, 136 kW): 802.4 V to 945.2 V. The largest stack, and the most headroom over the converter's 125 kW.

• SS7021-05 (13 modules, 208 kWh, 104 kW): 613.6 V to 722.8 V. Usable, but the bottom of its range sits just under 625 V, so expect the converter to derate at low state of charge.

SS7008-05 through SS7019-05 (5 to 12 modules) are not suitable. Every one of them falls below the converter's 580 V operating minimum somewhere in its range, and the 12-module SS7019-05 is the closest miss at 566.4 V.

Two further constraints worth checking against the size chosen:

• On a 3W+N+PE connection the converter's window narrows to 680 V to 950 V, which rules out the SS7021-05 and the SS7022-05 and leaves the SS7024-05, SS7026-05 and SS7027-05.

• For 100 percent unbalanced power control, or off-grid with a 100 percent unbalanced load, the vendor recommends keeping the DC input above 750 V. Only the SS7026-05 and SS7027-05 stay above that across their whole range.

<div class="kb-callout kb-callout-note"><p>This list is worked out from the published DC voltage windows in the two datasheets, not from a bench compatibility report, so treat it as the sizing shortlist rather than a tested matrix. The arithmetic is stated above so it can be re-checked for a converter model with a different DC window. Confirm the final pairing with the Test Team before quoting it to a customer.</p></div>

The BMS cable is not straight through. Make it up pin to pin as follows, from the battery's CAN 3 port to the converter's COM2 port:

• CAN High: battery CAN 3 pin 4 to converter COM2 pin 1.

• CAN Low: battery CAN 3 pin 5 to converter COM2 pin 2.

A standard straight-through patch lead will not work, and the symptom is simply no BMS communication.

Configure both ends of the link:

• Enable the BMS link on the converter. In eleHost, go to Setting, choose Communication Parameter, and set BMS to Enable. BMS Communication Fault Shutdown on the same screen decides whether the converter stops when the BMS link drops; on the unit these screenshots came from it is Disable, so the converter keeps running through a BMS comms loss. Choose deliberately, and remember to use Load Parameters to write the change.

• Set the battery protection window on the converter. In eleHost, choose Battery Protection in the Protocol List. The group carries the under-voltage protection point and its recovery point, the over-voltage protection point and its recovery point, the charge and discharge current limits, and the charge and discharge voltage limits. Every field is entered as a raw value that the software divides by ten, shown as /10(V) or /10(A) beside each box, so 8000 means 800.0 V and 1000 means 100.0 A.

• The same protection values are visible read-only on the device page in myPower24 once the unit is added, which is a quick way to confirm what the converter actually holds.

• On the battery, set the controlled device to Inpower. The Monet-AC speaks the Inpower BMS protocol, so the battery must be told to speak it too. On the H17 BMU go to Settings > General Settings and set Controlled device 1 to Inpower.

• The dry-contact input on COM3 can also be wired to signal a BMS fault. It is enabled or disabled in eleHost under Communication Parameter (Dry Contact 1 and Dry Contact 2), and each has a default-state setting of Normally Open or its opposite. Confirm which convention the installation uses before relying on it.

• [TODO: cross-link the H17 BMU device page once one exists in this knowledge base]

<div class="kb-callout kb-callout-danger"><p>The protection values in these screenshots are the ones read from one commissioned unit, not recommended defaults. Set the window from the battery manufacturer's own limits for the pack actually installed: a protection point set wider than the pack allows removes the converter-side backstop that protects it.</p></div>

Phase D - Maintenance & Monitoring

9. Monitoring

Once connected, the device page carries four tabs: Info, Actual Data, Advanced Data and Settings.

To confirm a healthy link:

• Actual Data shows the three phase voltages, currents and frequencies updating live, along with total active, reactive and apparent power, and the DC voltage, current and power.

• Control Mode on the same tab reads PQ when the converter is running and able to follow a dispatch.

• Info shows the Nameplate card with Rated Power and Authorized Capacity, plus the ARM, DSP and CPLD firmware versions read once when the device was added.

• Advanced Data carries the diagnostic set: DC bus internals, insulation resistance to ground, leakage current, the three temperatures and converter efficiency.

• No communication alarms are active on the device.

The Control section at the top of the Settings tab carries two commands, Power On/Off and Standby/Shutdown, above the power setpoints.

<div class="kb-callout kb-callout-danger"><p>Standby and Shutdown are two separate commands, not a toggle. To bring a shut-down unit back up use <strong>Power On</strong>, not the Standby control.</p></div>

10. Troubleshooting

Reported by the LoggerV:

• "Failed to scan ID (device did not respond to all register groups)": the converter did not answer every register block the driver reads, so it was not added. Check the module IP address, that port 502 is reachable from the LoggerV, and the Modbus slave id. This message also appears when a different device answers on the address.

• "Serial number is required to add an Elecod Monet-AC": no serial was entered. This converter has no serial register, so the field is mandatory; take the serial from the unit label.

• "Rated Power is set outside of documented range, every plant-control dispatch will be mis-scaled until this matches the nameplate": the Rated Power setting is not between 100 kW and 130 kW. Correct it to the physical nameplate value before dispatching, as in section 7.

Reported by the converter, communication:

• "EMS communication failure": the converter has lost the monitoring link. Check the network path and that the LoggerV is still polling.

• "BMS communication failure" and "BMS fault": the battery link on COM2 is down or the BMS is reporting a fault. Check the cable pinout first, because it is a crossover and not straight through (section 8), then the BMS Enable setting on the converter and Controlled device 1 on the battery.

• "Internal communication failure": an internal module link has failed; this needs the vendor.

Reported by the converter, grid side:

• "Grid wrong phase": the AC phase sequence does not match. Check the J4 terminal order, N, A, B, C left to right.

• "Grid over-voltage", "Grid under-voltage", "Grid over-frequency" and "Grid under-frequency": the grid is outside the configured protection window. Confirm the protection thresholds, which are percentages of the Rated Voltage setting, before treating it as a grid problem.

• "Islanding protection": the converter detected a loss of grid and disconnected.

Reported by the converter, DC and battery side:

• "DC voltage reverse": DC polarity is swapped. The orange terminal is DC+ and the black terminal is DC-.

• "Low DC voltage" and "High DC voltage": the battery is outside the converter's DC operating range, which is 580 V to 1000 V on a 3W+PE connection and 680 V to 1000 V on a 3W+N+PE connection.

• "Insulation impedance fault" and "Leakage current fault": an earth-insulation problem on the DC side. The recorded positive and negative ground impedance and leakage current series show whether this developed gradually or appeared at once.

Reported by the converter, thermal:

• "Temperature derating": the converter is reducing output because of temperature. This is normal above 45 °C ambient; the unit is rated to 60 °C with derating.

• "High ambient temperature" and "Bridge over-temperature": check the cabinet airflow. The module needs 8.2 cubic metres per minute of intake air and the cabinet should have an exhaust fan at its air outlet.

• "Fan fault 1" and "Fan fault 2": an internal cooling fan has failed, which will lead to derating or an over-temperature trip.

• "A output overload alarm", "B output overload alarm" and "C output overload alarm", and the matching "A-phase output overload" faults: the converter is beyond its overload envelope, which is 110 percent continuous and 120 percent for one minute.

Reading the module's own indicator lights:

• Power (red): on means the auxiliary supply is normal; off means an auxiliary supply problem.

• Status (green): on means running normally; off means the module is shut down; blinking means it is in firmware programming mode.

• Fault (red): on means a shutdown fault and the module has stopped; blinking means an alarm with the module still running; off means no faults or alarms.

If you see a generic or unexpected error, capture the message and the device serial and raise it with support.

11. Who can do what

• Regular user (basic): can view the device page and all live data, and edit almost every setting on it. That covers the power setpoints, the battery settings and protection window, the nameplate settings, the operating and grid-forming modes, the dry contacts and the communication settings, and it includes sending the Power On/Off and Standby/Shutdown commands.

• Advanced user (advanced): can additionally edit the two grid-code groups, being the grid protection thresholds and times, and the low- and high-voltage ride-through settings including their two enables.

• OEM (oem): full device control. A higher tier bypasses the lower-tier gates, so there is nothing on this device that only an OEM can reach.

<div class="kb-callout kb-callout-warning"><p><strong>Rated Power is editable by a regular user</strong>, and getting it wrong mis-scales every plant-control dispatch as described in section 7. The field only accepts 100 kW to 130 kW and raises a warning alert outside that band, but nothing stops a wrong value inside it. Treat it as a commissioning setting and leave it alone afterwards.</p></div>

12. Tips & gotchas

• There is no communication watchdog. The converter has no dead-man timer that the LoggerV uses, so a setpoint it is holding stays applied if the LoggerV stops commanding. On an orderly LoggerV restart the LoggerV commands 0 kW first, but a power cut to the gateway, a pulled network cable or a crashed process does not take that path and the converter holds its last setpoint. Factor this into the plant's safety design.

• A wrong Rated Power also shows the wrong model name. The model designation on the device page is derived from the Rated Power setting, so a page reading Monet-100AC on a unit you know is a 125 kW machine is a quick tell that the setting needs correcting.

• The converter clock is not read. Its real-time clock registers do not answer on current firmware, so the LoggerV neither displays nor sets the converter clock. This affects only the converter's own internal event log, not monitoring, dispatch or platform timestamps.

• Above 3000 m altitude the converter derates, and on a fully unbalanced grid-connected or off-grid load the vendor recommends keeping the DC input above 750 V.