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battery_compatibility:byd_b-box [2019-10-09 01:56]
guy_stewart [9. Step by Step Installation Guide]
battery_compatibility:byd_b-box [2020-07-15 08:41] (current)
guy_stewart [Victron & BYD]
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-====== Victron & BYD B-Box ===== +====== Victron & BYD ====== 
- +  
-The combination of Victron products with BYD Battery-Box LV lithium batteries has been tested and certified by the Victron and BYD R&D departments. This combination has extensive field experience and is actively supported by both companies. +^  Battery ^  Pro 2.5-10.0 ^  Pro 12.8 & 13.8 ^  L 3.5-14.0 ^ Premium LVL 15.4 ^ Premium LVS 4.0 ^ 
- +|  Appearance |  {{ :battery_compatibility:byd-bbox2-5.jpg?nolink&100 |}}|  {{ :battery_compatibility:byd-bbox13-8.jpg?nolink&100 |}}|  {{ :battery_compatibility:byd-l3-5.jpg?nolink&100 |}}| {{:battery_compatibility:byd_premium_lvl.jpg?nolink&150|}}  |  {{:battery_compatibility:byd_lvs.jpg?nolink&80}}  
-The BYD B-Box includes an integrated Battery Management System (BMS) with each battery cell module, and a Battery Management Unit (BMU) that interfaces with the Victron [[venus-os:start|GX device]] and supports multiple battery modules.  +|  ESS |  yes|  yes|  yes|  yes|  yes| 
- +|  Grid Backup|  yes|  yes|  yes |   yes|  yes| 
- +|  Off-Grid|  yes|  yes|  no|  yes|  yes
- +|  Module capacity|  2.5 kWh |  13.8 kWh |  3.5 kWh|   15.36 kWh|  4.0 kWh| 
-^  Battery ^  Pro 2.5-10.0 ^  Pro 12.8 & 13.8 ^  L 3.5-14.0 ^ +|  Module limit |  32|  32|  12|  64|  64
-|  Appearance |  {{ :battery_compatibility:byd-bbox2-5.jpg?nolink&100 |}}|  {{ :battery_compatibility:byd-bbox13-8.jpg?nolink&100 |}}|  {{ :battery_compatibility:byd-l3-5.jpg?nolink&100 |}}|  +|  Max capacity|  80 kWh|  441.6 kWh|  42 kWh|  983 kWh|  256 kWh|
-|  ESS |  yes|  yes|  yes|  +
-|  Grid Backup|  yes|  yes|  yes |  +
-|  Off-Grid|  yes|  yes|  no| +
-|  Module capacity|  2.5 kWh |  13.8 kWh |  3.5 kWh|  +
-|  Module limit |  32|  32|  12|  +
-|  Max capacity|  80 kWh|  441.6 kWh|  42 kWh|  +
- +
- +
 ===== 1. Product & System compatibility ===== ===== 1. Product & System compatibility =====
  
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   * Off-grid   * Off-grid
  
 +=== 1.2 A GX device is required, eg Cerbo GX, Color Control GX (CCGX), Venus GX (VGX), etc === 
  
 +It is essential to use the BMS-Can (or CAN-bus) connection of a [[venus-os:start|GX device]] with the BYD batteries for the keep-alive signal, communication of charge and discharge limits, error codes and state of charge. 
  
-=== 1.2 A GX device is required, eg Color Control GX (CCGX), Venus GX (VGX), etc ===  +When used with B-Box Pro series batteries, the minimum supported firmware version for the [[venus-os:start|GX device]] is v2.42. When used with B-Box Premium LV series, the minimum supported GX device firmware version is v2.52. It is recommended to use the latest firmware version on new installations and when trouble shooting issues.
- +
-It is essential to use the CAN-bus connection of a [[venus-os:start|GX device]] with the BYD batteries for the keep-alive signal, communication of charge and discharge limits, error codes and state of charge.  +
- +
-When used with B-Box batteries, the minimum required firmware version for the [[venus-os:start|GX device]] is v2.15. It is highly recommended to use the latest firmware version on all connected devices, including CCGX/VGX, Inverter/Charger and MPPTs. There are regular updates to improve performance and reliability+
  
 === 1.3 All 48V Multis, MultiPlusses, MultiGrids and Quattros are compatible === === 1.3 All 48V Multis, MultiPlusses, MultiGrids and Quattros are compatible ===
  
-The minimum firmware version is 422Though updating to the latest firmware is recommended where possible.+The minimum supported firmware version is 469Updating to the latest firmware is recommended for new installations, and troubleshooting issues.
  
 These inverter/charger units must be connected to the [[venus-os:start|GX device]] via the VE.Bus connection port.  These inverter/charger units must be connected to the [[venus-os:start|GX device]] via the VE.Bus connection port. 
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 In off-grid systems, the control functions of the BYD Battery Management System (BMS) are built into the latest version of the [[venus-os:start|GX device]]. In off-grid systems, the control functions of the BYD Battery Management System (BMS) are built into the latest version of the [[venus-os:start|GX device]].
  
 +=== 1.4 Solar Charger compatibility ===
  
 +All 48V BlueSolar and SmartSolar VE.Direct MPPT Chargers are compatible (*).
  
 +Some of our Solar Chargers feature a VE.Direct communication port, some feature a VE.Can communication port, and some feature both. Both of these types of communication ports can be used to connect the Solar charger to the GX Device. Such connection is mandatory, because it is used to regulate charge currents and voltages.
  
-=== 1.4 All 48V BlueSolar and SmartSolar MPPT Chargers are compatible === +When planning to use the VE.Can communications port to connect the Solar Charger(s), make sure to select a GX Device that has sufficient CAN-Bus ports. The Color Control GX has only one such port, its VE.Can portand is therefor not suitable. All other GX Devices can be usedsince they have two portsOne can then be used to connect the BYD battery, and the other to connect the Solar Charger.
- +
-For proper operation, the B-Box battery needs to be able to control the charge current of the solar MPPTs. +
-It is recommended to use the MPPTs with VE.Direct port with BYD batteries.  +
- +
-__MPPTs with a VE.Direct port__ +
- +
-MPPTs are controlled via the [[venus-os:start|GX device]]. Make sure the [[venus-os:start|GX device]] runs v2.15 or later, and the MPPTs to 1.39 or the latest available version.  +
- +
-The MPPT requires connection to the [[venus-os:start|GX device]] to regulate charge currents as the batteries require (due to temperature, etc) +
-To test operationtry disconnecting the [[venus-os:start|GX device]] from the MPPT. After a time-outthe MPPT will stop charging and flash an error code on its LEDs. The error code is [[https://www.victronenergy.com/live/mppt-error-codes#err_67_-_no_bms|error #67: no BMS]].  +
- +
-__MPPTs with a VE.Can port__ +
- +
-Firmware should be at least version 2.05. +
- +
-When using VE.Can MPPT'sit is recommended to use the Venus GX (VGX)instead of the CCGXThe VGX has two CAN-bus interfaces available and allows communication between the MPPTs, BYD and the VGX. +
  
 +(*) with exception of the models “BlueSolar MPPT 150/70 CAN-bus” and “BlueSolar MPPT 150/85 CAN-bus” which are end-of-life since 2019. Legacy systems, historically installed with this configuration using the allow to charge contacts are not required to make any changes, see the legacy chapter below for details.
  
 === 1.5 Battery compatibility === === 1.5 Battery compatibility ===
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 | B-BOX Compact        | | B-BOX Compact        |
 | B-BOX L 3.5-14.0     | | B-BOX L 3.5-14.0     |
 +| B-BOX Premium LVL 15.4     |
 +| B-BOX Premium LVS 4.0     |
  
-BYD also releases firmware update for their BMU and BMS. BMU Firmware versions earlier than V4-13 are not compatible with Victron equipment and can cause the battery to not be detected.  +BYD also releases firmware update for their BMU and BMS. 
- +
-Minimum BYD firmware version: BMU_V2_V4-13_15-Mar-2017.+
  
-On-screen, or via Remote Console on the [[venus-os:start|GX device]], this version is named v4.13. +B-Box Pro BMU Firmware versions earlier than V4-13 are not compatible with Victron equipment and can cause the battery to not be detected
  
-Batteries with older firmware versions can be updated. Please contact BYD for more information.+Minimum BYD firmware version for B-Box Pro: BMU_V2_V4-13_15-Mar-2017. On-screen, or via Remote Console on the [[venus-os:start|GX device]], this version is named v4.13. Batteries with older firmware versions can be updated. Please contact BYD for more information.
  
 +BYD B-Box Premium batteries firmware should be no less than V1.4, and the BMS firmware should be no less than V1.3. If necessary, this can be updated automatically via the ethernet port on the BMU when connected to the internet.
  
 ===== 2. Minimum Battery Sizing ===== ===== 2. Minimum Battery Sizing =====
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 The following information is provided by BYD, it is reproduced here for your convenience and should always be confirmed with the latest BYD manuals and specifications.  The following information is provided by BYD, it is reproduced here for your convenience and should always be confirmed with the latest BYD manuals and specifications. 
  
-Each battery cell is approximately 50Ah at 48V (51.2V nominal).+Each B-Box Pro 2.5 battery module is approximately 50Ah at 48V (51.2V nominal).
  
 The following charge rates are managed automatically by the BYD BMU and [[venus-os:start|GX device]]. Temperature effects on charge rates should be considered in the design stage in hot and cold climates.  The following charge rates are managed automatically by the BYD BMU and [[venus-os:start|GX device]]. Temperature effects on charge rates should be considered in the design stage in hot and cold climates. 
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 === Battery Modules Required - Pro 2.5 === === Battery Modules Required - Pro 2.5 ===
- 
  
 |Phases|  Single Phase|  Three Phase|  Single Phase|  Three Phase| |Phases|  Single Phase|  Three Phase|  Single Phase|  Three Phase|
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 +=== Battery Modules Required - Premium LVL 15.4 ===
  
 +|Phases|  Single Phase|  Three Phase|  Single Phase|  Three Phase|
 +|  Inverter/Charger |  On-Grid \ with Full Backup |  On-Grid \ with inrush |  Off-grid |  Off-grid \ with inrush |
 +|  Multiplus 48/3000/35|  1|  1 \ 2|  1|  1 \ 2|
 +|  Multiplus 48/5000/70|  1|  2 \ 2|  1|  2|
 +|  Quattro 48/5000/70-100/100|  1|  2 \ 2|  1|  2|
 +|  Quattro 48/8000/110-100/100|  1|  2 \ 3|  1|  2|
 +|  Quattro 48/10000/140- 100/100|  1|  3 \ 4|  1|  3 \ 4|
 +|  Quattro 48/15000/200- 100/100|  1 \ 2|  4 \ 6|  2|  4 \ 6|
 +|  EasySolar 48/3000/35-50 MPPT150/70|  1|  1|  1|  1|
 +|  EasySolar 48/5000/70-100 MPPT150/100|  1|  2 \ 2|  1|  2|
  
-The specification for these minimum battery sizes was obtained from [[http://alpspower.com.au/wp-content/uploads/2018/05/Battery-Box-LV-Res-2.510.0-Mini-configuration-list.pdf|BYD’s 2018 minimum specification guide.]] There is an [[http://alpspower.com.au/wp-content/uploads/2017/10/B-BOX-LV-Pro-13.8-Minimum-configuration-list.pdf|additional guide here]] for the 12.8 and 13.8 models.  
  
 +=== Battery Modules Required - Premium LVS 4.0 ===
  
 +|Phases|          Single Phase| Three Phase| Single Phase|   Three Phase|
 +|  Inverter/Charger |  On-Grid |  On-Grid |  Off-grid |  Off-grid \ with inrush |
 +|                   Multiplus 48/3000/35|  1|  2|  1|  4 \ 6|
 +|                   Multiplus 48/5000/70|  1|  2|  2|  6 \ 8|
 +|             Quattro 48/5000/70-100/100|  1|  2|  2|  6 \ 8|
 +|            Quattro 48/8000/110-100/100|  1|  2|  4|  8 \ 12|
 +|          Quattro 48/10000/140- 100/100|  1|  4|  5|  12 \ 16|
 +|          Quattro 48/15000/200- 100/100|  1|  4|  7*|  16 \ 24|
 +|     EasySolar 48/3000/35-50 MPPT150/70|  1|  2|  1|  4 \ 4|
 +|   EasySolar 48/5000/70-100 MPPT150/100|  1|  2|  2|  8 \ 8|
  
 +* Note for 7 units two stacks are required. One stack is 4 battery modules, the other is 3.
  
-===== 3. CANBus Wiring =====+**"With inrush"** - this is the advice for systems that have load profiles that use the full surge capacity of the inverter, eg Multiplus 48/5000/70 providing 10 kW for 5 seconds to start an electric motor.  
 + 
 +The specification for these minimum battery sizes was obtained from [[http://alpspower.com.au/wp-content/uploads/2018/05/Battery-Box-LV-Res-2.510.0-Mini-configuration-list.pdf|BYD’s 2018 minimum specification guide.]] There is an [[http://alpspower.com.au/wp-content/uploads/2017/10/B-BOX-LV-Pro-13.8-Minimum-configuration-list.pdf|additional guide here]] for the 12.8 and 13.8 models, and [[https://secureservercdn.net/198.71.233.41/x4m.ee6.myftpupload.com/wp-content/uploads/2020/03/BYD-Battery-Box-Premium-LVL-Minimum-Configuration-List-V1.0.pdf|here for the Premium LVL 15.4 model.]] 
 + 
 + 
 +===== 3. CAN-Bus wiring between the battery and GX Device =====
  
 Use the //VE.Can to CAN-bus BMS type A Cable//, part number ASS030710018. Plug the side which is labeled Battery BMS into the BYD BMS. Plug the side labeled Victron VE.Can into the [[venus-os:start|GX device]]. Use the //VE.Can to CAN-bus BMS type A Cable//, part number ASS030710018. Plug the side which is labeled Battery BMS into the BYD BMS. Plug the side labeled Victron VE.Can into the [[venus-os:start|GX device]].
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 Without properly connecting this cable, the battery will not show up on the display of the [[venus-os:start|GX device]]. The battery will also turn itself off after several minutes. Without properly connecting this cable, the battery will not show up on the display of the [[venus-os:start|GX device]]. The battery will also turn itself off after several minutes.
  
-It is important to ensure this connection and display of the battery on the [[venus-os:start|GX device]] display before attempting firmware updates or settings changes on other devices if they depend on the power supply from the battery. Without this connection, the battery may turn off unexpectedly. If a reliable DC power supply is requiredyou can temporarily disconnect the individual BYD battery cells inside their cabinet from the internal Battery Management Unit (BMU). It is the BMU that signals the battery cells to shut down if the signal from the [[venus-os:start|GX device]] has not been received. This is a temporary measure, DO NOT attempt to operate the battery cells normally without connection to the BMU.  +It is important to ensure this connection and display of the battery on the [[venus-os:start|GX device]] display before attempting firmware updates or settings changes on other devices if they depend on the power supply from the battery. Without this connection, the battery may turn off unexpectedly. It is possible to bypass this automatic shutdownand other protections temporarily by disconnecting the individual BYD battery cells inside their cabinet from the internal Battery Management Unit (BMU). It is the BMU that signals the battery cells to shut down if the signal from the [[venus-os:start|GX device]] has not been received. This is a temporary measure for use only when troubleshooting to resume normal operation, DO NOT attempt to operate the battery cells normally without connection to the BMU. 
- +
- +
- +
- +
-=== 3.1 Wiring of the Allow-to-charge and allow-to-discharge contacts === +
- +
-Using the latest firmware on all devices, the BYD allow to charge contacts are only required when using VE.Can MPPT's.  +
-If you have an existing system that is configured using the Allow-to-charge contacts, and it is operating correctly, you do not need to make any changes. +
- +
-The MPPTs with a VE.Can port have a dedicated Remote On/Off input. It needs to be connected to battery positive to enable the charger. Leaving the Remote On/Off input floating or pulling it to ground will disable the charger. +
- +
-B-Box relays: +
- +
-  * Relay T1-T2: closed if allowed to discharge +
-  * Relay T4-T5: closed if allowed to charge +
- +
-{{:battery_compatibility:byd_bmu.jpg?nolink&400|}} +
  
 ===== 4. VEConfigure settings ===== ===== 4. VEConfigure settings =====
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-===== 5. GX device Configuration =====+===== 5. GX device configuration =====
  
 On the [[venus-os:start|GX device]], go to Settings, System setup: On the [[venus-os:start|GX device]], go to Settings, System setup:
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 |Shared Voltage Sense |OFF|  |Shared Voltage Sense |OFF| 
  
-If you have a VE.Can MPPT, it is advised to use the Venus GX in place of the CCGX. 
  
 * Select the //CAN-bus BMS (500 kbit/s)// CAN-profile in the CCGX. Menu path: //Settings -> Services -> CAN-profile// * Select the //CAN-bus BMS (500 kbit/s)// CAN-profile in the CCGX. Menu path: //Settings -> Services -> CAN-profile//
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 {{ :battery_compatibility:byd-parameters.png?nolink&290 | }} {{ :battery_compatibility:byd-parameters.png?nolink&290 | }}
  
-This parameters page is also a good place to check that all batteries are connected and working properly. In normal working conditions, for the 2.5 model, the current limit is 35A per cell. For example, 140A charge current limit ( 140 / 35 = 4 ) means there are 4 BYD battery cells connected.  +This parameters page is also a good place to check that all batteries are connected and working properly. In normal working conditions, for the 2.5 model, the charge current limit is ~35-50 A per cell. For example, 140A charge current limit ( 140 / 35 = 4 ) means there are 4 BYD battery cells connected.  
-Note this figure has been increased in recent firmware versions - so it may appear slightly higher (eg 40A per cell)+ 
 +Note these limits have been adjusted higher by BYD during firmware updates, so the charge and discharge current limit figure may appear slightly higher.
  
 === Color Control GX Configuration === === Color Control GX Configuration ===
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 The CCGX only has one available VE.Can port. It is not possible to connect both CAN products such as VE.Can MPPT (250 kbit/s) and an B-Box battery CAN-bus (500 kbit/s) together on the CCGX. As the BYD Battery MUST be connected, you will need to use the port for that. This will mean no data is collected from the VE.Can MPPT, nor can the CCGX control it. This means you are required to use the "Allow to Charge" wire configuration for the MPPT.    The CCGX only has one available VE.Can port. It is not possible to connect both CAN products such as VE.Can MPPT (250 kbit/s) and an B-Box battery CAN-bus (500 kbit/s) together on the CCGX. As the BYD Battery MUST be connected, you will need to use the port for that. This will mean no data is collected from the VE.Can MPPT, nor can the CCGX control it. This means you are required to use the "Allow to Charge" wire configuration for the MPPT.   
  
-=== Venus GX Configuration ===+=== GX Device with multiple CAN-bus port configuration ===
  
-The VGX has two CAN-bus interfaces available. The VE.Can MPPT will remain connected to the VE.Can port, while the BYD CAN-bus cable should use the specific CAN-bus connections (H, L, GND).  +With GX devices that have two CAN-bus interfaces available (eg Cerbo GX and Venus GX), the VE.Can MPPT will remain connected to the VE.Can port, while the BYD CAN-bus cable should use the specific CAN-bus connections (H, L, GND), or BMS-Can ports. 
-This allows data from the MPPT and BYD battery simultaneously. You will only need to connect the Allow-to-charge wires if using the VE.Can MPPT and VGX+ 
 +This allows data from the MPPT and BYD battery simultaneously. 
  
 The CAN-bus connections are galvanically isolated at the BYD BMU. There is no issues using the non-isolated connection of the VGX.  The CAN-bus connections are galvanically isolated at the BYD BMU. There is no issues using the non-isolated connection of the VGX. 
  
-===== 6. VE-Direct MPPT Settings =====+===== 6. Solar Charging =====
  
-In normal operation the MPPT charge characteristics are governed by the [[venus-os:start|GX device]] connected to the BYD battery+==== 6.1 Victron MPPT charger settings ====
  
-This section presumes familiarity with [[victronconnect:start|VictronConnect]]+Victron MPPT charge characteristics are automatically configured & governed by the [[venus-os:start|GX device]]. The settings below are a precautionary measure only:
  
-The settings below are a precautionary measure.  +^ MPPT Parameter ^ Setting ^ 
- +|Battery voltage     |48V|
-^MPPT Parameter ^ Setting ^ +
-|Battery voltage    |48V|+
 |Absorption voltage   |56.5V| |Absorption voltage   |56.5V|
  
 +Use [[victronconnect:start|VictronConnect]] for Solar Charger configuration.
 +
 +==== 6.2 Self-Startup from Low voltage shutdown modes ====
 +
 +In a correctly configured system, the inverter will shut itself down before the batteries enter a self protective shut down state. 
 +
 +If your system is charged only with an AC-coupled PV inverter, this may prevent the AC-coupled PV inverter from starting up to recharge the batteries. Therefore it is strongly recommended that there is also either a generator or DC MPPT charge controller to provide DC bus power to bring the inverter back online to allow normal recharging to resume. 
 +
 +Even a single 100/20 48V MPPT charger unit with 2 x 60 cell solar panels would be sufficient to add this self correcting mechanism able to maintain the DC bus voltage and improve longterm system reliability considerably from accidental deep discharge and subsequent shut down. 
 ===== 7. Example Wiring Diagram ===== ===== 7. Example Wiring Diagram =====
  
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   * Could be a temporary issue, that corrects self automatically after a short while (matter of minutes).   * Could be a temporary issue, that corrects self automatically after a short while (matter of minutes).
   * Could be an external issue, unacceptable voltage or current.   * Could be an external issue, unacceptable voltage or current.
 +
 ===== 9. Step by Step Installation Guide ===== ===== 9. Step by Step Installation Guide =====
  
 There is a step by step installation video that demonstrates the essential connections and programming that is required for installation of a BYD battery in a Victron system. It is accessible via the [[https://professional.victronenergy.com/api/accounts/e-learning/?service=https%3A//www.easy-lms.com/victronenergy/login|E-Learning section in Victron Professional]], and a [[https://professional.victronenergy.com/accounts/sign-up/|free Victron Professional Installer Account]] is required.  There is a step by step installation video that demonstrates the essential connections and programming that is required for installation of a BYD battery in a Victron system. It is accessible via the [[https://professional.victronenergy.com/api/accounts/e-learning/?service=https%3A//www.easy-lms.com/victronenergy/login|E-Learning section in Victron Professional]], and a [[https://professional.victronenergy.com/accounts/sign-up/|free Victron Professional Installer Account]] is required. 
- 
- 
  
 [[https://professional.victronenergy.com/api/accounts/e-learning/?service=https%3A//www.easy-lms.com/victronenergy/login|{{:battery_compatibility:byd_installation.jpg?400|}}]] [[https://professional.victronenergy.com/api/accounts/e-learning/?service=https%3A//www.easy-lms.com/victronenergy/login|{{:battery_compatibility:byd_installation.jpg?400|}}]]
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 This written manual should be assumed to be the more accurate and up-to-date, if there are any discrepancies between the video and the written manual,  This written manual should be assumed to be the more accurate and up-to-date, if there are any discrepancies between the video and the written manual, 
  
-A user contributed [[battery_compatibility:byd_b-box-steps|step by step installation guide is available here.]] Please be aware that this guide is no longer current. It should not be considered best practice, but provides further detail and insights from an actual installation.  +==== Introduction to the new BYD Premium range LVL and LVS  ==== 
-===== 10. Known Issues =====+ 
 +[[https://www.easy-lms.com/course-47826|{{:battery_compatibility:byd_lvl_video.jpg?400|}}]] 
 + 
 +==== User contributed installation guide ====  
 + 
 +A user contributed [[battery_compatibility:byd_b-box-steps|step by step installation guide is available here.]] Please be aware that this guide is no longer current. It recommends legacy practices and should not be considered current best practice, but provides further detail and insights from an actual installation. 
 +  
 +===== 10. Known Issues with B-Box Pro models ===== 
 + 
 +The following information only applies to the B-Box Pro models, and not to the B-Box Premium models.
  
-=== 10.1 Inaccurate State of Charge (SoC) Readings ===+=== 10.1 Inaccurate State of Charge (SoC) Readings with B-Box Pro models ===
  
 Each BYD battery module has it’s own BMS. This BMS reports it’s battery information to the BMU which is connected to the [[venus-os:start|GX device]] and reported to the user and the system.  Each BYD battery module has it’s own BMS. This BMS reports it’s battery information to the BMU which is connected to the [[venus-os:start|GX device]] and reported to the user and the system. 
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 There has been a firmware revision for the BYD battery modules and BMU that improves cold weather performance slightly. This manual will be updated with the new (slightly improved) specifications when stock supplied with the new firmware has had sufficient time to enter the market. Contact your BYD distributor for further information about this. There has been a firmware revision for the BYD battery modules and BMU that improves cold weather performance slightly. This manual will be updated with the new (slightly improved) specifications when stock supplied with the new firmware has had sufficient time to enter the market. Contact your BYD distributor for further information about this.
  
-=== 10.4 Self-Startup from Low voltage shutdown modes === 
  
-In a correctly configured system, the inverter will shut itself down before the batteries enter a self protective shut down state+===== 11Legacy systems using allow-to-charge and allow-to-discharge contacts =====
  
-If your system is supplied only with AC-bus solar chargingthis may prevent the solar inverter from starting up to recharge the batteries. Therefore it is strongly recommended that there is also either a generator or DC MPPT charge controller to provide DC bus power to bring the inverter back online to allow normal recharging to resume+For proper operation, the B-Box battery needs to be able to control the charge current of the solar MPPTs. Which for all modern models is arranged via the VE.Can and VE.Direct digital communication protocols. The very first two BlueSolar Chargers made by Victron, the “BlueSolar MPPT 150/70 CAN-bus” and “BlueSolar MPPT 150/85 CAN-bus” modelsdo no support such control, and were therefor controlled with a wire: the allow-to-charge wire. 
 + 
 +The purpose of this chapter is to serve as reference guide for legacy systems using those two solar charger models. If you have an existing system that is configured using the Allow-to-charge contacts, and it is operating correctly, you do not need to make any changes.  
 + 
 +Note that these charges cannot be used with the BYD Premium LV batteries, since they do not feature the required free contacts. 
 + 
 +=== Legacy system wiring details === 
 + 
 +The Remote On/Off input of the two mentioned solar charger models is used to signal that they can or cannot charge the battery. It needs to be connected to battery positive to enable the charger. Leaving the Remote On/Off input floating or pulling it to ground will disable the charger. 
 + 
 +B-Box relays: 
 + 
 +  * Relay T1-T2: closed if allowed to discharge 
 +  * Relay T4-T5: closed if allowed to charge 
 + 
 +Picture showing these connections on the BYD B-Box battery: 
 + 
 +{{:battery_compatibility:byd_bmu.jpg?nolink&400|}}
  
-Even a single 100/20 48V MPPT charger unit with 2 x 60 cell solar panels would be sufficient to add this self correcting mechanism able to maintain the DC bus voltage and improve longterm system reliability considerably from accidental deep discharge and subsequent shut down.  
  
-===== 11. Further Information =====+===== 12. Further Information =====
  
 For information about where to buy or find suitably qualified installers, visit the [[https://www.victronenergy.com/where-to-buy|Where to Buy Page.]] For information about where to buy or find suitably qualified installers, visit the [[https://www.victronenergy.com/where-to-buy|Where to Buy Page.]]
battery_compatibility/byd_b-box.1570579018.txt.gz · Last modified: 2019-10-09 01:56 by guy_stewart