CanadianSolar EP Cube All in one Single Phase User Guide

User Guide for CanadianSolar models including: EP Cube All in one Single Phase, EP Cube, All in one Single Phase, Single Phase, Phase

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Trouble Shooting Guide For EP Cube

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EP Cube Trouble Shooting Guide-EU-ENG V2.2

Trouble Shooting Guide For EP Cube

February 18,2025

Contents
1. Disclaimer ............................................................................................................................................................................... 3 2. Purpose of the document ................................................................................................................................................. 3 3. Basic Installation diagram with online / backup and bypass paths ..................................................................... 4 4. LED Behavior.......................................................................................................................................................................... 5 5. Where to find alerts and warnings in the APP............................................................................................................ 7 6. Where to find alert and warnings in the Web Portal ............................................................................................... 9 7. Alerts Troubleshooting.....................................................................................................................................................11 8. Warnings Troubleshooting .............................................................................................................................................14 9. Contact Us ............................................................................................................................................................................17

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1. Disclaimer This document is provided for guidance purposes only and does not replace professional advice. While every effort has been made to ensure the accuracy and reliability of the information contained herein, we cannot guarantee its completeness and accuracy. Unless specified otherwise, this guide does not replace the safety precautions outlined in the product labels or in the installation manual. Therefore, users are encouraged to consult the Installation Manual for specific guidance. The contents of this document may undergo alterations due to product updates or other factors. Document might change without any prior notice.
2. Purpose of the document This troubleshooting document serves as a resource aimed at resolving technical issues and operational challenges encountered with our product, EP Cube. Its primary purpose is to provide users with clear and concise guidance on identifying, diagnosing, and rectifying common problems or errors that may arise during usage. By outlining step-by-step instructions, troubleshooting documents empower users to effectively troubleshoot issues independently.

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3. Basic Installation diagram with online / backup and bypass paths

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4. LED Behavior Our EP Cube System has a blue LED strip on the right side that provides information regarding the current status of the system.

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Our WIFI Dongle (RTU) is located on the left side of the inverter and has 4 LEDs that

provide information regarding the status of the connection.

PWR

Power on

OFF

Power off

COM

Communication with the inverter is normal

FLASH

Communication with the inverter is abnormal

OFF

Power off

NET

WIFI connected

FLASH

WIFI disconnected

OFF

Power off

SRV

Communication with server is normal

FLASH

Communication with server is abnormal

OFF

Power off

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5. Where to find alerts and warnings in the APP

Open the EP Cube APP Tap on the "More" icon

Tap on "Alert & Warning"

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The "Alert" tab will show past and ongoing minor errors.

The "Warning" tab will show past and ongoing major errors.

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6. Where to find alert and warnings in the Web Portal Log-in the website https://monitoring-eu.epcube.com/ with your account credentials, then click on "Overview".
All the plants that currently have a fault ongoing will show up here.

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By clicking on the "historic" button, a list of the currently ongoing alarms and warnings will appear.

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7. Alerts Troubleshooting

Alerts indicate a condition that could impair or even force the inverter to stop if the

problem is not corrected. In some cases, the inverter can be forced to stop but will try to

resume normal operation if the condition that triggered the alert disappears.

Alert Message

Possible Reasons Troubleshooting

Reverse connection of the CT of the customer's meter
Third party inverter meter CT reversal
Failed CT failure of customer's meter

The orientation of the CT in the meter measuring the energy exchange with the Grid is incorrect or it's placed in the N line instead of the L line
The orientation of the CT in the meter measuring the production of the AC coupled inverter is incorrect or it's placed in the N line instead of the L line
Grid Meter Failure (the communication with the the meter measuring the energy exchange with the Grid is lost)

1) Check CT installation (location and orientation) and turn on a load to check it in the app/meter screen. 2) It is highly recommended NOT to extend the CT Cable. 3) The CT location must be in between the Power Meter and the first possible electrical panel, before any AC cable split/parallel. Check the schematic in section 2 for further details. Repeat these steps until fixed. If no solution is found, please contact service support. 1) Check CT installation (location and orientation) and check if in the app the AC power coming from the 3rd party inverter is correctly displayed 2) It is highly recommended NOT to extend the CT Cable. 3) The CT location must be in between the 3rd Party inverter and its own breaker. Check the schematic in section 2 for further details. If no solution is found, please contact service support. 1) Check if the meter cable is loose cable or broken 2) Check if there are any interferences/joints on the cable that could cause miscommunication with the meter. 3) Check if meter is turned on correctly. 4) Do a system and meter power cycle 5) If no solution is found, please contact service support.

Third Party Inverter Meter CT Inverter Meter Failure 1) Check if the meter cable is loose cable or

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Failure

Battery single cell full alarm

Battery single cell emptying alarm

Battery collection total voltage full alarm

Battery collection total pressure discharge alarm

Charge/Discharge

over

temperature alarm

(the communication with the meter measuring the production of the AC coupled inverter is lost)
One cell in the battery system is fully charged and has reached the maximum voltage value. One cell in the battery system has reached the minimum voltage limit value. The battery is fully charged and has reached the maximum voltage value. The battery has reached the minimum voltage limit value.
The battery temperature is over 55° degrees

broken 2) Check if there are any interferences/joints on the cable that could cause miscommunication with the meter. 3) Check if meter is turned on correctly. 4) Do a system and meter power cycle 5) If no solution is found, please contact service support. This alert will go away once there is enough load to discharge the battery. If it keeps NOT discharging and the battery stays at 100%, please contact service support. This alert will go away once there is enough PV energy to charge the battery. If it keeps NOT charging and the battery stays at low SoC, please contact service support. This alert will go away once there is enough load to discharge the battery. If it keeps NOT discharging and the battery stays at 100%, please contact service support. This alert will go away once there is enough PV energy to charge the battery. If it keeps NOT charging and the battery stays at low SoC, please contact service support. If the ambient temperature is above 55° the battery system cannot work properly. Check if: 1) The system is installed under direct sunlight 2) There are heating sources nearby the inverter 3) The ambient air circulation is obstructed / insufficient and/or the ambient temperature is too high. If any of the three points is true, then the installer needs to rectify the installation in order to let the system be in the correct temperature range to properly work. If nothing else can be the source of the heat, please contact service support.

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Charge/Discharge temperature alarm

low The battery temperature If the ambient temperature under 0° the battery

is under 0° degrees

system cannot work properly. Check if:

1) The system is installed outside (ex. under

direct snow, ice, rain, etc.)

2) There are no covers above the inverter

3) If the ambient is extremely cold (ex. a cellar,

etc.), check if there is enough

insulation/heating

prevent

humidity/cold/etc.

If any of the three points is true, then the

installer needs to rectify the installation in order

to let the system be in the correct temperature

range to properly work. If nothing else can be

the source of the cold, please contact service

support.

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8. Warnings Troubleshooting

Warnings are raised whenever a circumstance prevents the operation of the inverter.

The inverter will not resume operation until the user solves the problem and restarts

the inverter.

Warning Message Possible Reasons Troubleshooting

Meter disconnection
DC input voltage is high PV1/2 overvoltage peak value DC input voltage is low
PV1/2 reverse connection

There is no communication between EP Cube and the meter measuring the energy exchange with the Grid.
Voltage from the PV is higher than the maximum voltage limit
Voltage from the PV is lower than the minimum voltage required
The positive and negative of the strings are reversed

1) Check if the meter cable is loose cable or broken 2) Check if there are any interferences/joints on the cable that can cause miscommunication with the meter/inverter. 3) Check if meter is turned on correctly. 4) Perform a system and meter power cycle 5) If no solution is found, please contact service support. Measure the voltage of the string/s and if one/both exceed the maximum voltage limit on the datasheet, it is necessary to modify the string to make it work within the inverter VoC/Vmppt range. Measure the voltage of the string/s and if one/both are under the minimum voltage threshold on the datasheet, it is necessary to troubleshoot the string to make it work within the inverter VoC/Vmppt range. 1) Check if PV1/2+ and PV1/2- are reversed. 2) Check that the polarity of the strings is correct.

Phase A voltage 1/2/3/4- There is an overvoltage

stage high

on the AC side

The Grid voltage is above the country code threshold. The inverter will stop to operate. 1) Check that the correct region settings are selected. 2) Check whether there are any anomalies on the AC side cabling. 3) Measure the grid voltage. If above the country threshold, please wait until grid is again in correct range. 4) If under, please contact service support.

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Phase A voltage 1/2/3/4stage low
Frequency 1/2-stage high/low
Phase A overcurrent/peak overcurrent Hardware PDP failure Island protection

There is an undervoltage on the DC side
The AC line frequency is not stable, therefore the inverter stops to operate.
Excessive load or other external anomalies cause the current to exceed the maximum current allowed by EP Cube This error is usually triggered during other faults. There is a grid/earth problem

The Grid voltage is below the country code threshold. The inverter will stop to operate. 1) Check that the correct region settings are selected 2) Check whether there are any anomalies on the AC side cabling. 3) Measure the grid voltage. If under the country threshold, please wait until grid is again in correct range. 4) If above, please contact service support. 1) Check that the correct region settings are selected 2) Check if the frequency is within the country thresholds. If outside the range, the inverter will stop operating until it is back in the normal range. 3) Analyse if this problem comes from another appliance (ex. some engines/pump can cause a frequency drop/rise); if so, please investigate and eliminate the issue. 4) If the problem originates from the grid, please contact grid distributor. 5) If no solution is found, please contact service support. 1) If it's a transient or if loads decrease, it will recover automatically. 2) If not, please contact service support.
1) Check for other warnings present at the same time. 2) If there are none, please contact service support. 1) Check whether grid status is normal. If not, please wait until grid comes into normal operative status. 2) If yes, take measurements of L-N, L-PE, N-PE and contact service support.

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Emergency stop press

The EPO jumper is missing 1) If the EPO jumper is missing, please follow

or the emergency button,

the manual and install it correctly.

if installed, has been

pressed.

PV1/2 Insulation Abnormal

PV DC leakage

2) If it's installed, check if it makes proper contact on the pins EPO- and EPO+. After that, perform a power cycle and the problem should recover. 3) If the Emergency button has been installed and pressed, please perform a system reboot after making sure the system is safe to be restarted. 4) If issue persists, please contact service support. 1) Check if there is any DC leakage from the panels with appropriate device (Insulation Tester). 2) The threshold for the alarm to appear is 75k Ohm. If the PV string/s are below this insulation value, please investigate and solve what is causing the issue (broken PV cable, bad grounding, etc.). The machine will then start to operate normally again once the insulation is corrected. 3) If issue persists, please contact service support.

Ungrounded

There is no ground conductor connected in the inverter

1) Check if there is any grounding mistake (ex. Not properly screwed ground, node not making contact, etc.) 2) If no issue is found, please contact service support.

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9. Contact Us Eternalplanet Energy Co. Ltd Inverter Hotline (Spain-Portugal): +49 89 5199689 2529 (support in English and Spanish language) Inverter Hotline (Italy): +49 89 5199689 2528 (support in English and Italian language) Inverter Hotline (United Kingdom + South Africa): +49 89 5199689 2530 (support in English language) Inverter Hotline (Germany): +49 89 5199689 2525 (support in German language)
Email: service.es@epcube.com , (For Spain only) Email: service.pt@epcube.com , (For Portugal only) Email: service.it@epcube.com , (For Italy only) Email: service.de@epcube.com , (For Germany only) Email: service.uk@epcube.com , (For United Kingdom only) Email: service.sa@epcube.com , (For South Africa only)

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References

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