MPP Solar RS485 User manual

BMS RS-485 Card/Box Quick Guide V.1.3

Thank you for purchasing RS485 card/box. This manual contains instructions and warnings that

should be followed during the installation, operating and storage of the card. Please keep this

manual for further reference.

Applicable models:

Hybrid inverter 3KW, 4KW, 5KW and 5.5KW

3-phase hybrid inverter 10KW and 15KW

Single phase off-grid inverter 4KW/5KW

Split phase off-grid inverter 6KW

Online 48V 3KVA/5KVA/6KVA UPS

Before installation, please make sure this RS-485 card/box is compatible to your

existing inverter.

1. Product Introduction

If the inverter is built in intelligent slot, it can work with RS485 card by simply inserting the

RS485 card. RS485 external box can provide communication slot for the inverter without

intelligent slot. No matter it’s RS485 card or RS485 box, it provides communication between

inverter and lithium battery.

Here are the detailed functions:

Via the communication between the inverter and lithium battery, it’s able to re-configure

the charging voltage, charging current, battery discharge cut-off voltage and max.

discharge current, according to the lithium battery parameters.

Have unit start or stop charging according to the status of lithium battery.

Have unit start or stop discharging according to status of lithium battery.

Special Precautions

If this card/box must be stored prior to installation; storage must be in a dry place

The admissible storage temperature range is from -10ºC to +70ºC.

BMS RS-485 Card/Box Quick Guide V.1.3

2. Unpacking and Overview

2-1. Package Contents

Before installation, please inspect the unit. Be sure that nothing inside the package is damaged.

You should have received the following items inside of package:

RS485 Card Package Items:

RS485 card RJ45 cable Manual

Note: This supplied RJ45 cable is custom-made.

RS485 Box Package Items:

RS485 box RJ45 cable RS232 cable Manual

Note: This supplied RJ45 cable is custom-made.

2-2. Product Overview

RS485 card:

RS-485 port

Golden finger(RS-232 port)

Resistance switch

Communication switch

BMS RS-485 Card/Box Quick Guide V.1.3

RS485 box:

RS-485 communication port

12V DC input: 12V DC/1A power source for communication card

* It’s necessary to have 12VDC power source. Please purchase an AC/DC adapter

separately.

RS-232 communication port

3. Configuration

3-1. Communication Format Configuration

*It’s request to use 9600bps baud rate and no parity check1 stop bit if

communicating with BMS. The Bit setting for # 1 is OFF, # 2 is ON, # 3 is ON, #

4 is OFF.

Function

Bit Setting

Meaning

Baud

rate

# 2

# 1

OFF

2400bps

OFF

4800bps

OFF

9600bps*(Default)

19200bps

Parity

check

# 4

# 3

OFF

Even parity

OFF

Odd parity

OFF

No parity check 1 stop bit

(Default)

No parity check 2 stop bits

BMS RS-485 Card/Box Quick Guide V.1.3

3-2. RS485 resistance configuration

Function

Bit #

Setting

Meaning

Push up resistance

# 6

Enable (Default)

OFF

Disable

Push down resistance

# 7

Enable (Default)

OFF

Disable

Terminate resistance

# 8

Enable (Default)

OFF

Disable

3-3. SW1 Reset

All of dip switches in SW1 should be switched to “OFF” status.

Bit #

Setting

Meaning

# 1

OFF

Disable(Default)

# 2

OFF

Disable(Default)

# 3

OFF

Disable(Default)

# 4

OFF

Disable(Default)

# 5

OFF

Disable(Default)

# 6

OFF

Disable(Default)

# 7

OFF

Disable(Default)

# 8

OFF

Disable(Default)

There are three bits to configure the RS485

resistance. Use the bit #6, #7 and #8 of SW2 to

set RS485 Resistance. From top to bottom, it’s 1

to 8 as shown left. When the switch is pushed

down, the bit is set to “OFF”. Otherwise, the bit

is set as “ON”.

BMS RS-485 Card/Box Quick Guide V.1.3

3-4. Lithium battery communication configuration

1. ADD Switch: There are 4 ADD switches are to define different baud rate and battery group

address. If switch position is turned to bottom for “OFF” position, it means “0”. If switch

position is turned to upper for “ON” position, it means “1”.

Dip 1 is “ON” to represent the baud rate 9600.

Dip 2, 3 and 4 are to set up battery group address.

Dip switch 2, 3 and 4 on master battery (first battery) are to set up or change the group

address.

NOTE: “1”is upper position and “0”is bottom position.

Dip 1

Dip 2

Dip 3

Dip 4

Group address

1: RS485

baud rate=9600

Restart to take

effect

Single group only. It’s necessary to set up master

battery with this setting and slave batteries are

unrestricted.

Two-group condition. It’s necessary to set up

master battery on the first group with this setting

and slave batteries are unrestricted.

Two-group condition. It’s necessary to set up

master battery on the second group with this

setting and slave batteries are unrestricted.

NOTE: The maximum groups of lithium battery is 2 and for maximum number for each group,

please check with battery manufacturer.

BMS RS-485 Card/Box Quick Guide V.1.3

3-5. Interface Configuration

RS-485 pin configuration on BMS RS485 Card/Box:

Function

RS-485 - B

RS-485 - A

GND

RS-485 pin configuration on Lithium battery:

Function

RS-485 - B

RS-485 - A

GND

RS-485 - A

RS-485 - B

4. Installation and Operation

After configuration, please install this card/box with inverter and Lithium battery by following

below steps.

RS485 card

Follow below steps to install and use this

RS485 card:

RS485 box

Follow below steps to install and use this RS485

box.

(1) Insert this RS485 card into intelligent

slot of the inverter.

(1) Use supplied RS232 cable to connect RS485

box and the inverter.

BMS RS-485 Card/Box Quick Guide V.1.3

(2) Use supplied RJ45 cable to connect

RS485 card and Lithium battery.

(2) Use supplied RJ45 cable to connect RS485

box and Lithium battery.

(3) Switch on Lithium battery.

(4) Please purchase an AC/DC adapter

separately to supply DC input (12VDC) to

RS485 box.

Adapter plug dimension: OD=5.5mm ID=2.5mm

(4) Turn on the inverter.

(5) Switch on Lithium battery.

(6) Turn on the inverter.

After all wires are connected well and the communication between the inverter and battery is

successful, it will show different successful icon on the LCD screen. Please check below table.

Model

Hybrid inverter

3KW/4KW/5KW/5.5K

Split phase off-grid

inverter 6KW

Hybrid inverter

3KW/4KW/5KW/10KW/

15KW

Single phase

off-grid inverter

Online UPS

LCD

screen

Frame of battery icon

will flash

“Li-bAt” icon will light on.

“Li” icon will light on.

BMS RS-485 Card/Box Quick Guide V.1.3

Active Function

This function is to activate lithium battery automatically while commissioning. After battery

wiring and commissioning is successfully, if battery is not detected and active function is

enabled in bundled software, the inverter will automatically activate battery if the inverter is

powered on.

5. Code Reference (Only for 3KW/4KW/5KW/10KW/15KW models)

Related information code will be displayed on LCD screen. Please check inverter LCD screen for

the operation.

Code

Description

Informs inverter to stop discharging battery.

Informs inverter to stop charging battery.

Informs inverter to charge battery.

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