BYD Battery-Box Premium LVL Instruction Manual

: June 6, 2024
: BYD

Table of Contents

BYD Battery-Box Premium LVL
GENERAL STEPS
ERROR ANALYSIS
Undervoltage
SERVICE TASKS
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

BYD Battery-Box Premium LVL

Make sure to always use the latest version of this service document, available at: www.bydbatterybox.com

Important: The installation and all other kinds of works or measurements in combination with the Battery-Box Premium are only allowed by professional and qualified electricians.
This checklist is a shortened assistance for the Battery-Box and does not replace the original manual, which can be found on www.bydbatterybox.com / www.eft- systems.de / www.alpspower.com.au Subject to technical modifications; no responsibility is accepted for the accuracy of this information.
Attention: Improper handling can cause danger and damage.

GENERAL STEPS

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

ERROR ANALYSIS

Please refer to the general steps before proceeding, see chapter 1.

BMU shows no reaction / No LED
LEDs of BMU do not light up, although the battery is ON.

Communication problem with Inverter

Communication problem with Inverter

Problem with the Firmware Update / App Configuration

The Battery Management 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 update can take up to 30 Minutes until the firmware is updated on the BMS .

ERROR ANALYSIS 1

BMU/BMS LED event code (EC)
A constant white LED refers to standby mode. White blinking means charge or discharge.
When the battery is initiating, 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. We start to count when the white LED begins to flash, then we count how many times white and blue LED flashes. (also refer to the manual!)
Example: 1xwhite, 6xblue → EC 106 / 1xwhite, 11xblue → EC 111 / 3xwhite, 3xblue → EC 303

Most Errors come from a faulty communication line, incorrect app configuration or missing restart after app-configuration.
Please go in detail through: Section 1, 2.2 & 2.3

Note: if the system is not correctly configured with the app, the event code (EC) might be misleading.
Note: every LVL has its own BMS. The Event Code of the BMS will therefore be shown in the LED of the individual LVL.

$BMU BMS LED event code $EC$$

$BMU BMS LED event code $EC$-1$

$BMU BMS LED event code $EC$-2$

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

read the battery information,
configure the battery system
update BMU & BMS firmware
update Parameter Table
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 on www.bydbatterybox.com / www.eft- systems.de / www.alpspower.com.au
For the service analysis, please download and provide the data / logs as described in the program instructions (see PDF manual inside of program ZIP archive).

Note: You need a windows computer that will be connected to the battery Wifi.

ERROR ANALYSIS-3

Voltage measurement and undervoltage
Attention: Make sure not to create a short circuit!

You can see the max. and min. cell voltage in the BeConnect App.
You can get the detailed module and cell voltage in the BCP Program (section 2.5)
or measure it manually according to the below description:

Measure the module voltage: Open the front door and measure the tower voltage between B+/B- (red circle).
Measure also between P+/P- (green circle) on the BMS as shown below.

ERROR ANALYSIS-4

Measure the cell voltages in case of BMS EC 107, EC 103, or if BCP shows cells with <1.5 V / does not show cell voltages. This will help us to understand if the issue is in the cell or in the BICs.
The voltage has to be measured in pairs as shown below. If the voltage is 0, in most cases this value is not correct and the measuring device is not in correct contact with the PINs. (please establish a correct and good contact)

ERROR ANALYSIS-5

Please record these measurements of 16 cells in total. (Cell Number 1-8 for button module, 9-16 for upper module)

Undervoltage

A LVL in which one of the 16 cells has a voltage of <1.5 V is in undervoltage (check with BCP (section 2.5) / BC if possible).

LVL with >45 V should be fine and you can continue to check other points according to this service guideline.
If the LVL voltage is <45V but the single cell voltage is >1.5V, the battery needs to be charged quickly while avoiding any further discharge. Therefore shutdown the system and search the problem according to the guideline, while the battery is completely off. Also check on the inverter side why the force charge doesn’t work. Do not turn on the battery before making sure the inverter should be able to charge the battery.
If only one LVL is in undervoltage: remove that one and try commissioning without it. Otherwise, make sure to avoid further overdischarge. (Turn off the system completely)
If one, or all LVL are in undervoltage: Contact the service as stated below and make sure to avoid any further discharge of the battery (Turn off the system completely)

When contacting the service, make sure to fill the service checklist completely and add the following information:

Serial Numbers (of the BMU and all (affected) LVL)
Individual LVL voltages of all LVL (related to Serialnumber)
Logs from the battery using BCP (section 2.5) and Screenshots showing the cell voltages, or manual cell voltage measurements
Initial Firmware (FW) Version of the Battery when the UV happened (BMU and BMS)
Detailed description how and why the system reached Undervoltage if known. Information 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 Batteries status when the battery was left (on / off / LED).
Inverter Model, Serial Number and Inverter Logs
Access to Inverter portal (add info@eft-systems.de and tell us the name of the system in the portal)