BYD HVS 5.1, HVS 7.7, HVS 10.2, HVS 12.8 Manual

Also See for HVS 5.1:

Quick start manual (62 pages)

Operating manual (60 pages)

Manual (16 pages)

Table of Contents

Contents

1 GENERAL STEPS
2 ERROR ANALYSIS
3 SERVICE TASKS
- 3.1 BCU replacement
- 3.2 Module Replacement
4 Documents / Resources
- 4.1 References
- 4.2 Download manual

BYD HVS 5.1, HVS 7.7, HVS 10.2, HVS 12.8 Manual

GENERAL STEPS

Always make sure to use the latest version of this service document, available at: www.bydbatterybox.com
Please proceed first with the installation steps by:

No.	Name	Description
1	Con figuration	Check if the configuration is correct. Refer to the latest "BYD Battery-Box Premium HVS & HVM Compatible Inverter List" (V2.19 or above) available at: www.bydbatterybox.com Make sure the inverter is configured correctly.
2	Only HVS or HVM	Do not mix up HVS-modules ("I") with HVM-modules ("II").
3	External connections	Port for parallel connection Communication to inverter Ethernet port (strongly recommended) Grounding DC-Ports
4	Latest firmware	Always install / update the latest firmware (also use the latest app version). Note: If not stated otherwise, the default Wi-Fi password is BYDB-Box.
5	App configuration	To complete the commissioning, the configuration of the battery via "BYD Be Connect 2.0" app or "BYD Be Connect Plus" (BCP) tool for PC is mandatory.
6	Proper restart	NOTE: It is important that the battery is switched on before the inverter! Else, the BCU might not start and not show any reaction (no LED, no Wi-Fi). Defined restart (mind the sequence) Switch off the battery (press LED button for 5 seconds)* Turn off DC switch of the inverter Turn off AC switch Kostal only: Pull out the PV strings from inverter wait 1 minute Turn on the battery (flip up the air switch) Kostal only: Connect PV strings back to inverter Turn on the AC switch Turn on the DC switch on the inverter *if the battery does not switch off despite pressing the LED button for 5 seconds, lift off the BCU to avoid further discharge and contact the service team.
7	Check the correct operation	The system runs properly if: Inverter displays battery SOC correctly System charges / discharges Note: If you can not complete the commissioning, then turn off the battery before you leave the site and make sure all the LEDs are off. If this is not possible, remove the BCU. Make sure the system will be set into operation quickly.

ERROR ANALYSIS

BCU shows no reaction / No LED

LED does not light up, although the system is switched on.

No.	Name	Description
8	Module quantity	Check if the module quantity fulfills the minimum requirement (HVS: 2, HVM: 3 modules) and check the "Compatible Inverter List" for inverter requirements.
9	Voltage measurement	( Make sure the voltage of the battery tower is higher than 120V.)
10	Follow the sequence correctly	NOTE: It is important that the battery is switched on before the inverter! Else, the BCU might not start and not show any reaction (no LED, no Wi-Fi). See following: Switch off the battery (press power button for 5 seconds) Turn off DC switch of the inverter Turn off AC switch Kostal only: Pull out the PV strings from inverter wait 1 minute (inverter should be completely off) Turn on the battery (flip up the air switch ) → LED should light up again Kostal only: Connect PV strings back to inverter Turn on the AC switch Turn on the DC switch on the inverter
11	Only LED off?	Check if there is a Wi-Fi access point of the Battery-Box. If so, only the external LED is inactive, but commissioning could still work. In that case make sure that the internal cable of the LED is connected properly.
12	BCU exchange	Only if voltage looks good: Test another BCU, if available.

BCU switch cannot be flipped up / LED remains on

The system switches off immediately (within 5 seconds) / LED remains on even though the system switch is off.

No.	Name	Description
13	Switch was flipped down by hand	If the switch was flipped down manually, then it cannot be flipped up again within 10 10 minutes. ( Please refer to the manual for the correct switch-off procedure.)
14	Steady blue LED? EC102? (1 xwhite, 2 xblue)	Try to properly shut down the BCU ( press the LED button for more than 5 seconds ). If LED goes off: check the installation and restart the system (battery first, then inverter). If the LED remains on ( steady blue or 2x blinking blue): Remove the BCU from the tower to avoid a deep discharge. Measure the voltage of the system and contact your service provider. You can use another BCU, if available.
15	BCU exchange	Only if the voltage looks good: Test another BCU, if available.

Problem with the Firmware Update / App Configuration / Battery Wi-Fi

The BCU consists of two components: the BMU and the BMS. The firmware update from the app will update the BMU, which will then update the BMS. The BMS will only be updated once there is communication between the battery and the inverter or immediately after the app configuration. It can take up to 20 minutes for the firmware to be updated on the BMS .

No	Name	Description
16	Correct app and firmware	Make sure to have the latest app version (> 2.3.16) and battery firmware ( downloadable in the app) on your mobile device before connecting the app with the battery Wi-Fi. If the app cannot be installed, or if other general problems occur with the app: Try using a different mobile device Uninstall and reinstall the app Or try using the PC tool BCP
17	Wi-Fi cannot be found / Wi-Fi unstable	The battery Wi-Fi turns off 5 hours after the battery is activated. To reactivate the Wi-Fi, press the LED button about 1 second or restart the system. To reset the Wi-Fi, press the LED button three times 1 second within 6 seconds. If the problem remains: Remove the LAN cable during the configuration. Once the Battery has been configured correctly, you can connect it again to the Internet. Check whether other mobile devices are connected to the same Wi-Fi Try another mobile device
18	BMS version not updated	The app will only update the BMU. The BMU will automatically update the BMS, once the BMU is updated and the inverter communication is established correctly or right after the configuration is done. The BMS update can take about 20 minutes. If the BMS version is not updated after 20 minutes with stable inverter communication, follow the process below: Update the firmware through the app again Restart the system Switch off the inverter first, then switch off the battery (press LED button for 5 seconds) Wait for 30 Seconds Turn on the battery first, then turn on the inverter Wait for 20 minutes Check the BMS firmware version again with app. If the version is still wrong, repeat the update process(preferably with another mobile device).

Battery <> inverter communication / no charging or discharging

No.	Name	Description
19	Configuration	Check if the configuration is correct. Refer to the latest "BYD Battery-Box Premium HVS &HVM Compatible Inverter List" (V2.19 or above) available at: www.bydbatterybox.com Make sure the inverter is configured correctly.
20	App configuration and firmware	Please check if the app configuration has successfully done and the firmware is the most recent one. If there are problems, please refer to Problem with the Firmware Update / App Configuration / Battery Wi-Fi Section
21	Check terminal resistor	If only one tower is installed, a terminal resistor should be plugged into the "IN" port. If two or three towers are connected in parallel, a terminal resistor should be plugged into the "IN" port of the last slave tower.
22	Communication connection	Does the inverter properly detect the battery? Check if the inverter detects the battery parameters (e.g., SOC, battery temperature) correctly. If not, check the cabling: Confirm the PIN / cable configuration for the specific inverter model Replace the communication cable (min. CAT5; better to use CAT7) For Fronius & SMA: check the enable signal (necessary for battery activation)
23	Grounding	Connect Battery-Box directly to the ground bus of the house (do not connect it over the inverter casing or other devices). Proper grounding of the battery is essential for trouble-free and secure data transmission.
24	Battery relay closed? / output voltage available?	Once communication has been established between battery and inverter, the BCU is supposed to close the relay. Only then there will be output voltage. Therefore please check if output voltage is present. You can check this either by Be Connect 2.0 app / Be Connect Plus tool or by checking if the inverter correctly shows the battery voltage.
25	Restart the system	Defined restart (mind the sequence) Switch off battery (press LED button for 5 seconds)* Turn off DC switch of the inverter Turn off AC switch Kostal only: Pull out the PV strings from inverter wait 1 minutes Turn on the battery (flip up the air switch) Kostal only: Connect PV strings back to inverter Turn on the AC switch Turn on the DC switch on the inverter *Note: if the battery does not switch off despite pressing the LED button for 5 seconds, lift off the BCU to avoid further discharge, and contact the service team.

SOC & charging logic

No	Name	Description
26	SOC at commissioning	New HVS / HVM modules are delivered with a 30% SOC, while a new BCU might show a different SOC at the beginning (mostly 50% / 30% / 0%). The latter one should be understood as a placeholder value, since a new BCU cannot measure the SOC of modules. As soon as the system starts to run (charging/discharging) the SOC detection will be gradually corrected. The SOC calibration is completed at the latest after a full cycle.
27	SOC jumps	The SOC of an LFP battery cannot be measured; it is a calculated value. In general, the state of charge (SOC) of a battery is calculated using the voltage, but other factors such as temperature, current flow and charging behavior also play a role. The calculation of the SOC is generally more precise when the battery regularly undergoes full cycles. Every now and then an SOC correction / calibration may occur. If there are other questions, please contact the service team.

Unexpected shutdown

The system has been successfully commissioned in the past and has run for some time. Later on an unexpected shutdown occurred.

No	Name	Description
28	Inverter communication	The battery only works with a compatible external inverter. If, for any reason, the communication between the battery and inverter is lost, the battery will shut down automatically within 30 minutes. Therefore, check which one shut down first (battery or inverter) and check if inverter is properly detecting battery (e.g,. showing correct SOC or temperature). If communication problem remains
29	Battery logs / History data	Sporadic alarms are hard to detect as they only occur sometimes. Therefore, it is very important to download and provide all the historic battery log files in order to identify the root cause.
30	Inverter warning & monitoring	An unexpected shutdown can be caused by overall system settings. Therefore, it is necessary to evaluate inverter data as well. Which error message are shown in inverter (portal?) Please provide access to the inverter portal (add info@eft-systems.de and include the name of the system in the portal)

Module Extension / Parallel connection

No	Name	Description
31	Extension	Note: It is important that all modules of a storage tower have a similar SOC (tolerance: 5%). Within 5 days before extension, it is recommended to fully charge the existing battery system to 100% SOC at least once. New modules have about 30% SOC. Therefore, please ensure that the SOC of the original system is between 25% and 35% before adding a new module. Don't forget to adjust the number of modules in the configuration if necessary. If the 30% SOC rule is not followed, temporary capacity loss and SOC jumps might occur. In such cases, a charger may be required to align the SOC of the modules. Please contact your local service provider for assistance.
32	Parallel connection	Cabling / installation (including parallel connection) is described in the short installation guide. Here are some notes: A DC bus bar is needed to collect DC cables. There is a matching DC combiner box from BYD for the HVS / HVM. Please refer to the corresponding data sheet and manual of the BYD combiner box for details. Towers need to be the same type (module type & quantity). Communication is established between master and slave units. Only the master unit needs to be configured and updated; no configuration of the slave BCUs is necessary. Check terminal resistor: If only one tower is installed, a terminal resistor should be plugged into the "IN" port. If two or three towers are connected in parallel, a terminal resistor should be plugged into the "IN" port of the last slave tower.

Be Connect Plus (BCP)

Be Connect Plus is a PC tool. With Be Connect Plus (BCP) you can:

Read battery information
Configure the battery system
Update BMU & BMS firmware
Export / download battery logs

BCP is constantly being improved and updated. Make sure to use the latest program version. You can download the latest version of the tool at www.bydbatterybox.com / www.eft-systems.de / www.alpspower.com.au .
For analysis, please download and provide the data/logs as described in the program instructions (see PDF manual included).
Note: You need a computer with Windows that will be connected to the battery Wi-Fi.
Log in as Installer to Be Connect Plus. The default password for the battery Wi-Fi is the same: BYDB-Box
Be Connect Plus (BCP)

LED event code (EC)

A steady white LED indicates standby mode, while a blinking white LED means charging or discharging.
During battery initialization, the LED will flash white and blue with an interval time of 0.5 seconds (normal during startup). When the LED flashes blue with an interval time of 1 second, it indicates an event code. Please start to count when the white LED begins to flash, and then record how many times white and blue LED flashes (also refer to the manual for details). Examples:
1xwhite, 3xblue → EC 103
1xwhite, 11xblue → EC 111
3xwhite, 3xblue → EC 303
Most errors are caused by faulty communication, incorrect app configuration or a missing battery restart after the app or BCP configuration.
Note: If the battery is not correctly configured with the app, the event code (EC) might be misleading.

Event Code (EC)	Measure
EC 101	DC cable reverse connection / DC short-circuit Disconnect the DC cable connection between the inverter and the battery, and use a multimeter to measure whether there is a short circuit between P+ and P-. If there is no short circuit, please check whether there is a short circuit at the inverter port. If there is, proceed to the next step. Replace the BCU, then use Be Connect 2.0 or BCP tool to reconfigure it correctly, and then restart to confirm.
EC 102	Abnormal shutdown / PreCharge failure/ Module failure Check the DC cable connection to the battery, inverter and combiner box (if there is any). Try to properly shut down the BCU (press the LED button for 5 seconds). If LED goes off: check installation and restart (battery first, then inverter). If LED remains on, remove the BCU from the tower to avoid a deep discharge. Measure the voltage of the system and contact your service provider. Use BC/BCP to read the module cell voltage and temperature data, If any cell voltage <1.5V or temperature >70°C, remove the abnormal module. If the problem remains: Test another BCU, if available.
EC 103	Voltage Sensor Failure / BIC Communication Failure Make sure the terminal resistor is plugged in the correct position. Refer to the Manual. Remove the topmost module and check whether the event code disappears. Note: A module with communication problems often works without restrictions at the lowest module position, since no communication with the base is necessary. Check the cell voltage of all the modules with the BCP tool. If a module has an abnormal cell voltage, remove it and then reconfigure the system. If the problem disappears: Exchange the module. If the problem remains: Test another BCU, if available.
EC 104	Faulty temperature sensor Check via BCP to identify the abnormal module. Alternatively, follow "Module exclusion method".
EC 105	Pack Voltage Sensor Failure Check DC cable connection to the battery, inverter and combiner box (if there is any). Restart system properly If the problem remains: Test another BCU, if available.
EC 203 EC 303 EC 403 EC 503 EC 603 EC 703 EC 803		Incorrect module quantity / Module not detected Make sure the app configuration has been completed correctly (especially the module type and quantity). EC 203 to EC 803 means that a module is not recognized. The first number (= number of white LED flashes) indicates which module is probably affected. This module, or the module above it, can be responsible for the event code. Example: EC 203 = second module from the top / EC 403 = fourth-top module. Remove the affected module and check whether the event code disappears. If not, check the module above. Rearrange the modules in the tower. Note: A module with communication problems often works without restrictions at the lowest module position, since no communication with the base is necessary.
EC 106		Current Sensor Failure Make sure that the latest firmware is installed and that the battery has been properly restarted. If the problem remains: Test another BCU if available.
EC 107		Cell failure or voltage difference alarm(level 3) Check whether the cell voltage of each module is normal, and exchange the module if the cell voltage is abnormal. Follow ( Voltage measurement and undervoltage instruction)
EC 108		PreCharge Fault Check DC cable connection to the battery, inverter and combiner box (if there is any). - Restart system according to the manual. (Note: To properly shut down you need to press the LED button for 5 seconds. Make sure to start the battery before starting the inverter.) If the problem remains: Test another BCU, if available.
EC 109		BIC balancing failed Make sure that the latest firmware is installed and that the battery has been properly restarted. If the problem remains: it is probably caused by a module. Follow the "Module exclusion method".
EC 110		Low voltage The system needs to be charged very soon and should not be further discharged. Shut down the system quickly to avoid further discharge. Check whether the system can shut down normally (by pressing the LED button for 5 seconds). If the system cannot shut down normally, remove the BCU (Voltage measurement and undervoltage) Troubleshoot the problem while the battery is completely off / BCU is lifted. Check the other steps in the service guideline and also check the inverter (latest firmware version/correct and defined restart?) and consult with the inverter service team to determine why the force charge doesn't work(e.g., any faults at the inverter). Do not turn on the battery before ensuring the inverter is capable of charging the battery. If everything has been checked and the system cannot be charged, make sure to avoid further discharge (e.g., remove BCU) and contact the service team.
EC 111		Normal when the battery has just started. LED will turn to steady white when: inverter communication works (--> Check inverter communication ) right after saving / redoing the configuration (Be Connect 2.0: go through whole wizard / Be Connect Plus: resave the configuration by using the "Setup" button and restart tool to refresh) Please also make sure the terminal resistor is plugged in a correct position. Refer to the Manual. If EC111 remains even after the inverter detects battery and even after redoing app configuration, test another BCU if available.
EC 112		No communication with inverter. Check inverter communication

Voltage measurement and undervoltage

shock hazard ATTENTION: High voltage!
You can see the max. and min. cell voltage in the Be Connect 2.0 app. You can also get the detailed module and cell voltage in the BCP Program or measure it manually according to the description below:

Measurement of Tower Voltage
Remove the BCU and measure the tower voltage on the topmost module as shown below.
Note: The nominal voltage should be the module quantity times 100V (for HVS) or the module quantity times 50V (for HVM ).

Undervoltage
A module in which one of the 32 (HVS) / 16 (HVM) cells has a voltage of <1.5 V is considered to be in undervoltage (check with BCP / Be C onnect 2.0 if possible).
A HVS module with >90 V and a HVM module with >45 V should be fine, and you can continue to check other items according to this service guideline. Always make sure the firmware is the latest. If the module voltage is <90V (HVS) / <45V (HVM) but the single cell voltage is >1.5V, the battery needs to be charged quickly(follow the instructions of EC110 in ).

If only one module is in undervoltage: Remove that one and try to start the system without it (if the remaining modules still comply with the minimum quantity requirement). Otherwise, avoid further discharge (e.g., remove the BCU)
If one or all modules are in undervoltage: Contact the service team as stated below and make sure to avoid any further discharge of the battery (e.g remove BCU from the system)

When contacting the service team, make sure to fill out the service checklist completely and provide the following information:

Serial Numbers (of the BCU and all affected modules)
Tower voltage and individual module voltages of all modules (related to serial number)
What was the status of the system switch on the BCU when the undervoltage (UV) happened? (tripped or not) - If possible: Logs from the battery using BCP and screenshots showing the cell voltages
Initial firmware version of the battery when the undervoltage happened (BMU and BMS)
Inform if the BCU could shut down normally by pressing the LED button. (Note: if you have updated the firmware version after undervoltage, write down whether the battery could be switched off manually before the firmware update.)
Detailed description of how and why the system reached undervoltage if known. Include the information of when the system was installed and commissioned and in which circumstance and when the undervoltage happened. If the battery was never running before: Why did it never work before, and what was the battery's status when the battery
was left (on / off / LED)
Inverter model, serial number and inverter logs
Access to the inverter portal (addinfo@eft-systems.de and provide the name of the system in the portal)

Identifying a faulty module / Module exclusion method

The module quantity must be adjusted in the app whenever the number of modules is changed!

Install the Battery-Box system complying with the minimum quantity requirement (HVS: 2 modules, HVM: 3 modules).
Check System. If Okay , add one module at a time, adjust the module number in the app and check again

SERVICE TASKS

Please go through the general steps beforehand.

BCU replacement

Have you detected a faulty BCU?
After replacing the BCU, please remember to redo the configuration and firmware-update with the app or BCP.

Module Replacement

Have you detected a faulty module?
In the meantime, you can continue to use the battery system with the remaining modules and a correspondingly reduced capacity (taking into account the minimum number of modules).
Please note: It is important that all modules of a battery tower have a similar state of charge (SOC) with a tolerance of 5%. New modules have about 30 % SOC. If the remaining modules have not yet been put into operation (not charged / discharged), the new module can be easily added. Otherwise, it is basically a module extension. In this case, please add the new module to the system only when the SOC of the system is between
25% and 35% ( see extension process in the O perating M anual). Make sure to configure c orrectly after any change to the module quantity.
Module Replacement