Table of Contents
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BYD Battery-Box HV
Service Guideline from EFT-Systems
Version 2.0
Valid for H 5.1 / 6.4 / 7.7 / 9.0 / 10.2 / 11.5
Important: The installation and all other kinds of works or measurements in combination with the Battery-Box
HV are only allowed by professional and qualified electricians.
This manual is a shortened assistance for the installation of the Battery-Box High Voltage and does not replace
the original manual, which can be found on www.eft-systems.de or www.byd.com. The installation must be
carried out by a trained and qualified electrician. Attention: High Voltage! Improper handling can cause danger
and damage.
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Table of Contents
Summary of Contents for EFT BYD Battery-Box HV Series
- Page 1 the original manual, which can be found on www.eft-systems.de or www.byd.com. The installation must be ...
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Page 2: Table Of Contents
CONTENT CONTENT 1. CHECK INSTALLATION 3 2. ERROR ANALYSIS 4 2.1 BCU can not be switched on 2.2 BCU system switch falls after a few seconds 2.3 Current Alarm: BatteryCommErr 2.4 Current Alarm: MonitorCommErr 2.5 Communication problem 2.6 Current Alarm: BatteryDiff 5 ... -
Page 3: Check Installation
Installation in the Web - Installation Config: N umber of Modules + Inverter Manufacturer Interface - U pdate: install the latest released software (www.eft-systems.de) 6 State of charge (SOC) When installed for the first time, the battery will show a predefined SOC of 19%. ... -
Page 4: Error Analysis
2. ERROR ANALYSIS Please refer to the general steps before proceeding, see chapter 1. 2.1 BCU can not be switched on No reaction, LEDs on the BCU board do not light up, although the system switch is switched on. No. Name ... -
Page 5: Communication Problem
(see extension manual) If no module extension has taken place and all modules have been installed at the same time, please contact EFT-Systems. Please make a screenshot of the section RUN Data on the web interface. ... -
Page 6: Current Alarm: Ut / Ot (E.g Cell_Ut) / Systemp
EFT-Systems (screenshots). 30 UV2 If the battery is not being charged by the inverter immediately after restarting, then switch off the battery after a few minutes and contact EFT-Systems (screenshots, voltage). Charger necessary. 31 UV3 Immediately turn off the battery and contact EFT-Systems. ... -
Page 7: Voltage Measurement
2.10 Voltage measurement ATTENTION: High voltage! The nominal voltage is obtained by multiplying the number of modules by 50V. Nominal system voltage should therefore be in the range 200V-450V. If the measured voltage deviates significantly from the nominal value, please check the electrical voltage at the individual modules, as shown below: ... -
Page 8: Visual Check
2.11 Visual Check The PINs should not be bent or touch each other. Otherwise, a short circuit with a damage to the BCU is possible. Correct defect 2.12 Identifying a faulty module (Variant 1) ... -
Page 9: Identifying A Faulty Module (Variant 2)
3 modules with the spare module one at a time. Check the battery status after each step. If battery status turns to “OK”, the defect module is the one that was exchanged. 3. If the defective module is found, it may be replaced by a new replacement module. Please contact EFT-Systems. ... -
Page 10: Service Tasks
3. SERVICE TASKS Please go through the general steps beforehand, see chapter 1. 3.1 BCU replacement Have you detected a faulty BCU?: After replacing the BCU, please do not forget to re-do the configuration in the web interface (enter the number of modules and inverter brand) and install the latest BCU software approved for the inverter. -
Page 11: Service Contact
(Note: only necessary, if a faulty module was found!) F Inverter serial number and Important for EFT Systems to analyze and resolve the problem at system level model with the inverter partner. G If necessary: Delivery If replacement parts are required we need: ...
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