Must Power PV35 PRO-4K User manual

PC TV Air-
conditioning Fridge Washing
machine
Appliances
MPPT 4KW-12KW
SOLAR INVERTER/CHARGER

Table of Contents
ABOUT THIS MANUAL ........................................................................................................1
Purpose ..........................................................................................................................1
Scope .............................................................................................................................1
SAFETY INSTRUCTIONS ....................................................................................................1
INTRODUCTION ...............................................................................................................2
Features ..........................................................................................................................2
Basic System Architecture ...................................................................................................2
Product Overview ..............................................................................................................3
INSTALLATION .................................................................................................................4
Unpacking and Inspection ...................................................................................................4
Preparation ......................................................................................................................4
Mounting the Unit ..............................................................................................................4
Battery Connection ............................................................................................................5
AC Input/ Output Connection ...............................................................................................6
Final Assembly ................................................................................................................10
Communication Connection ...............................................................................................10
OPERATION . ..................................................................................................................10
Power ON/OFF ................................................................................................................10
Operation and Display Panel ..............................................................................................11
LCD Display Icons ............................................................................................................12
LCD Setting ....................................................................................................................14
Fault Reference Code .......................................................................................................19
Warning Indicator ...........................................................................................................21
Operating Mode Description ..............................................................................................22
Display Setting ................................................................................................................23
SPECIFICATIONS . ..........................................................................................................23
Table 1 Line Mode Specifications .........................................................................................23
Table 2 Inverter Mode Specifications ....................................................................................24
Table 3 Charge Mode Specifications .....................................................................................25
Table 4 General Specifications ............................................................................................26
TROUBLE SHOOTING ...................................................................................................... 27

ABOUT THIS MANUAL
Purpose
This manual describes the assembly, installation, operation and troubleshooting of this unit. Please read this manual
carefully before installations and operations. Keep this manual for future reference.
Scope
This manual provides safety and installation guidelines as well as information on tools and wiring.
The following cases are not within the scope of warranty
1. Out of warranty.
2. Series number was changed or lost.
3. Battery capacity was declined or external damaged.
4. Inverter was damaged caused of transport shift, remissness, ect external factor
5. Inverter was damaged caused of irresistible natural disasters.
6. Not in accordance with the electrical power supply conditions or operate environment caused damage.
SAFETY INSTRUCTIONS
WARNING: This chapter contains important safety and operating instructions. Read and keep
this manual for future reference.
1. Before using the unit, read all instructions and cautionary markings on the unit the batteries and all appropriate
sections of this manual.
2. CAUTION --To reduce risk of injury, charge only deep-cycle lead acid type rechargeable batteries. Other types
of batteries may burst, causing personal injury and damage.
3. Do not disassemble the unit. Take it to a qualified service center when service or repair is required. Incorrect
re-assembly may result in a risk of electric shock or fire.
4. To reduce risk of electric shock, disconnect all wirings before attempting any maintenance or cleaning. Turning
off the unit will not reduce this risk.
5. CAUTION --Only qualified personnel can install this device with battery.
6. NEVER charge a frozen battery.
7. For optimum operation of this inverter/charger, please follow required spec to select appropriate cable size. It' s
very important to correctly operate this inverter/charger.
8. Be very cautious when working with metal tools on or around batteries. A potential risk exists to drop a tool to
spark or short circuit batteries or other electrical parts and could cause an explosion.
9. Please strictly follow installation procedure when you want to disconnect AC or DC terminals. Please refer to
INSTALLATION section of this manual for the details.
10. GROUNDING INSTRUCTIONS- This inverter/charger should be connected to a permanent grounded wiring
system. Be sure to comply with local requirements and regulation to install this inverter.
11. NEVER cause AC output and DC input short circuited. Do NOT connect to the mains when DC input short circuits.
12. Warning!! Only qualified service persons are able to service this device. If errors still persist after following
troubleshooting table, please send this inverter/charger back to local dealer or service center for maintenance.
1

INTRODUCTION
This is a multi-function inverter/charger, combining functions of inverter, solar charger and battery charger to offer
uninterruptible power support with portable size. Its comprehensive LCD display offers user-configurable and
easy-accessible button operation such as battery charging current, AC/solar charger priority, and acceptable input
voltage based on different applications.
Features
Pure sine wave inverter
Configurable input voltage range for home appliances and personal computers via LCD setting
Configurable battery charging current based on applications via LCD setting
Configurable AC/Solar Charger priority via LCD setting
Compatible to mains voltage or generator power
Auto restart while AC is recovering
Overload/ Over temperature/ short circuit protection
Smart battery charger design for optimized battery performance
Cold start function
Basic System Architecture
The following illustration shows basic application for this inverter/charger. It also includes following devices to have
a complete running system:
Generator or Utility.
Battery
PV modules
Consult with your system integrator for other possible system architectures depending on your requirements.
This inverter can power all kinds of appliances in home or office environment, including motor-type appliances such
as tube light, fan, refrigerator and air conditioner.
2
Figure 1 Hybrid Power System
Power Grid
Battery
Generator
PC
TV
Air-conditioning
Fridge
Washingmachine
Load
AC INPUT
BAT INPUT BAT CHARGER
INVERTER
PV INPUT
PV + -
+-

NOTE: For parallel model installation and operation,
please check separate parallel installation guide for
the details.
Product Overview
3
1.Power saver on/off switch
2.LCD display
3.Status indicator
4.Discharging/Charging indicator
5.Fault indicator
6.Function buttons
7.Remote control port
8.BAT -
9.FAN
10.BAT +
11.WI-FI port
12.USB communication port
13.AC input /bypass breaker
14.AC output breaker
15.AGS(Auto Generator Start)
16.BTS
17.AC input
18.AC output
19.PV input
20.Ground
4KW-12KW single model
INVERTER
7 8
9
10
20
11 12
15 16
13 14
17 18 19 20
USB
AGS
BTS
WIFI
Solar Inverter
12
3 4 56
Solar Inverter

Mounting the Unit
Consider the following points before selecting where to install:
4
INSTALLATION
Unpacking and Inspection
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:
The unit x 1
User manual x 1
USB cable x 1
Software CD x 1
BTS Line x 1(Option)
WIFI Key x 1(Option)
Remote Line x 1(Option)
Preparation
Before connecting all wirings, please take off bottom cover by removing six screws as shown below.
Do not mount the inverter on flammable construction materials.
Mount on a solid surface.
Install this inverter at eye level in order to allow the LCD display
to be read at all times.
For proper air circulation to dissipate heat, allow a clearance of
approx. 50cm to the side and 80 cm above and below the unit.
o o
The ambient temperature should be between 0 c and 40 c to
ensure optimal operation.
The recommended installation position is to be adhered to the
wall vertically.
Be sure to keep other objects and surfaces as shown in the
diagram to guarantee sufficient heat dissipation and to have
enough space for removing wires
SUITABLE FOR MOUNTING ON CONCRETE OROTHER
NON-COMBUSTIBLE SURFACE ONLY.
INVERTER
INVERTER

Model Typical Amperage Battery Capacity Wire Size Torque Value
1*2AWG
1*1AWG
2*3AWG
2*2AWG
2~ 3 Nm
2~ 3 Nm
5
4024 200A 400AH 2*2AWG
2*1AWG
2~ 3 Nm
Please follow below steps to implement battery connection:
1. Assemble battery ring terminal based on recommended battery cable and terminal size.
Install the unit by screwing six screws
Battery Connection
CAUTION: For safety operation and regulation compliance, it's requested to install a separate DC over-current
protector or disconnect device between battery and inverter. It may not be requested to have a disconnect device in
some applications, however, it's still requested to have over-current protection installed. Please refer to typical
amperage in below table as required fuse or breaker size.
WARNING! All wiring must be performed by a qualified personnel.
WARNING! It's very important for system safety and efficient operation to use
appropriate cable for battery connection. To reduce risk of injury, please use the
proper recommended cable and terminal size as below.
Recommended battery cable and terminal size:
2*1AWG
3*2AWG
2~ 3 Nm
INVERTER
INVERTER
5024
4048
5048
6048
8048
10048
12048
250A
100A
130A
150A
200A
250A
300A
600AH
400AH
600AH
800AH
1000AH
1200AH
1400AH
2~ 3 Nm
2~ 3 Nm
2~ 3 Nm
2~ 3 Nm

NOTE: Please only use sealed lead acid battery or sealed GEL/AGM lead-acid battery.
3. Insert the ring terminal of battery cable flatly into battery connector of inverter and make sure the bolts are
tightened with torque of 2-3 Nm. Make sure polarity at both the battery and the inverter/charge is correctly
connected and ring terminals are tightly screwed to the battery terminals.
6
WARNING: Shock Hazard
Installation must be performed with care due to high battery voltage in series.
CAUTION!! Do not place anything between the flat part of the inverter terminal and the ring terminal.
Otherwise, overheating may occur.
CAUTION!! Do not apply anti-oxidant substance on the terminals before terminals are connected tightly.
CAUTION!!Before making the final DC connection or closing DC breaker/disconnector, be sure positive
(+) must be connected to positive (+) and negative (-) must be connected to negative (-).
AC Input/Output Connection
CAUTION!! Before connecting to AC input power source, please install a separate AC breaker between inverter and
AC input power source. This will ensure the inverter can be securely disconnected during maintenance and fully
protected from over current of AC input. The recommended appropriate of AC breaker is 40A for 4KW-6KW, 80A for
8KW-12KW.
CAUTION!! Please don't connect the output wring to "INPUT" terminal or connect the grid wring to the "OUTPUT"
terminal.
WARNING! All wiring must be performed by a qualified personnel.
WARNING! It's very important for system safety and efficient operation to use appropriate cable for AC input
connection. To reduce risk of injury, please use the proper recommended cable size as below.
Suggested cable requirement for AC wires
Torque ValueModel Gauge
6KW-8KW
10KW-12KW
8 AWG
2*10 AWG
1.4~ 1.6Nm
1.6~ 1.8Nm
4KW-5KW 10 AWG 1.4~ 1.6Nm

Ground (yellow-green)
L LINE (brown or black)
N Neutral (blue)
7
Please follow below steps to implement AC input/output connection:
1. Before making AC input/output connection, be sure to open DC protector or disconnector first.
2. Remove insulation sleeve 10mm for six conductors. And shorten phase L and neutral conductor N 3mm.
3. Insert AC input wires according to polarities indicated on terminal block and tighten the terminal screws. Be sure
to connect PE protective conductor ( ) first.
Ground (yellow-green)
L LINE (brown or black)
N Neutral (blue)
WARNING:
Be sure to that AC power source is disconnected before attempting to hardwire it to the unit.
4. Then, insert AC output wires according to polarities indicated on terminal block and tighten terminal screws.
Be sure to connect PE protective conductor ( )first.
BTS
USB
AGS
BTS
WIFI
5. Make sure the wires are securely connected.
CAUTION: Important
Be sure to connect AC wires with correct polarity. If L and N wires are connected reversely, it may cause utility
short-circuited when these inverters are worked in parallel operation.
CAUTION: Appliances such as air conditioner are required at least 2~3 minutes to restart because it's required to
have enough time to balance refrigerant gas inside of circuits. If a power shortage occurs and recovers in a short
time, it will cause damage to your connected appliances. To prevent this kind of damage, please check manufacturer
of air conditioner if it's equipped with time-delay function before installation. Otherwise, this inverter/charger will
trig overload fault and cut off output to protect your appliance but sometimes it still causes internal damage to the
air conditioner.

4024-80A
5024-80A
Model Typical Amperage Cable Size Torque
80A 8AWG 1.6~1.8 Nm
30~130Vdc
145Vdc
Battery voltage +3Vdc
Solar Charging Mode
Max. PV Array Open Circuit Voltage
PV Array MPPT Voltage Range
Min. battery voltage for PV charge
8
PV Module Selection:
When selecting proper PV modules, please be sure to consider below parameters:
1. Open circuit Voltage (Voc) of PV modules not exceeds max. PV array open circuit voltage of inverter.
2. Open circuit Voltage (Voc) of PV modules should be higher than min. battery voltage.
INVERTER MODEL 24V48V
PV Connection
CAUTION: Before connecting to PV modules, please install separately a DC circuit breaker between inverter and PV
modules.
WARNING! All wiring must be performed by a qualified personnel.
WARNING! It's very important for system safety and efficient operation to use appropriate cable for PV module
connection. To reduce risk of injury, please use the proper recommended cable size as below.
4048-80A
5048-80A
6048-80A
8048-100A/200A
10048-100A/200A
12048-100A/200A
80A 8AWG 1.6~1.8 Nm
60~130Vdc
Please follow below steps to implement PV module connection:
1. Remove insulation sleeve 10 mm for positive and negative conductors
2. Check correct polarity of connection cable from PV modules and PV input
connectors. Then, connect positive pole (+)of connection cable to positive
pole (+) of PV input connector. Connect negative pole (-) of connection
cable to negative pole (-) of PV input connector.
+
3
10
-
3mm max
10
USB
AGS
BTS
WIFI
3. Make sure the wires are securely connected.
100A/200A 6AWG/2*6AWG 1.8~2.0 Nm

9
PV Wiring
Wiring option 1
4-6KW MPPT 80A PV Input
Wiring option 2
8-12KW MPPT 100A PV Input
Wiring option 3
8-12KW MPPT 200A PV Input
Recommended PV module configuration
Solar panel installation schematic
PV Module Spec.(reference)
-260W
-Vmp:30.9Vdc
-Imp:8.42A
-Voc:37.7Vdc
-Isc:8.89A
-Cells:60
Inverter Model Solar Input Q’ty of modules
24V/80A
48V/80A
3S3P
3S6P
9PCS
18PCS

10
Final Assembly
After connecting all wirings, please put bottom cover back by screwing two screws as shown below.
Communication Connection
Please use supplied communication cable to connect to inverter and PC. Insert bundled CD into a computer and
follow on-screen instruction to install the monitoring software. For the detailed software operation, please check user
manual of software inside of CD.
OPERATION
Power ON/OFF/Power Saver
INVERTER
There are 3 different status for inverter: "ON(Power Saver)”"INVERTER OFF” and "ON”
When power switch is in "INVERTER OFF” position, the inverter is powered off.
When power switch is turned to either of "ON(Power Saver)”or "ON", the inverter is powered on.
Power saver function is designed to conserve battery power when AC power is not or rarely required by the loads. In
this mode, the inverter pulses the AC load . Whenever an AC load(greater than 80 watts) is turned on, the inverter
recognizes the need for power and automatically starts inverting and output goes to full voltage. When there is no load
(or less than 30 watts) detected, the inverter automatically goes back into search mode to minimize energy consumption
from the battery bank. In "ON(Power Saver)" mode, the inverter will draw power mainly in sensing moments, thus the
idle consumption is significantly reduced.

11
Messages
Yellow
Red
Solid On
Flashing
Flashing
Output is powered by grid in Line mode.
Output is powered by battery or PV in battery mode.
Battery is charging or discharging.
Fault occurs in the inverter.
Warning condition occurs in the inverter.
Solid On
Flashing
Function Keys
MENU
UP
DOWN
ENTER
Description.
Increase the setting data.
Decrease the setting data.
Enter setting mode and Confirm the selection in setting mode go to next selection.
Enter or exit setting mode or go to previous selection.
LED Indicator
LED Indicator
AC/INV Green
CHG
FAULT
Function Keys
Remote control
Apart from the switch panel on the front of the inverter, an switch panel connected to the RJ 11 port at the DC side of
the inverter thru a standard telephone cable can also control the operation of the inverter. If an extra switch panel is
connected to the inverter via "remote control port" together with the panel on the inverter case, the two panels will be
connected and operated in parallel.
Whichever first switches from "OFF” to "Power saver off' or "Power saver on" it will power the inverter on. If the
commands from the two panels conflict, the inverter will accept command according to the following priority:
Power saver on/Power saver off/Power off, Only when both panels are turned to "Unit Off' position will the inverter be
powered off.
The Max length of the cable is 10 meters.
Auto generator start (AGS)
There is an extra connector in front of the inverter used to start the generator. If the utility power is abnormal and
single battery discharges below setting point in program 19,the inverter will send out a signal to the cable of the
connector which is cascaded to the control circuit of the generator, owing to this the control circuit will get through and
then generator will be started. if single battery is charged higher than 13.5Vdc,the signal will disappear to make the
generator keeping closed again.
WARNING!
Never cut the telephone cable when the cable is attached to inverter and battery is connected to the inverter. Even
if the inverter is turned off. It will damage the remote PCB inside if the cable is short circuited during cutting.
Operation and Display Panel
The operation and display panel, shown in below chart, is on the front panel of the inverter. It includes three indicators,
four function keys and a LCD display, indicating the operating status and input/output power information.
Solar Inverter

12
Icon Function description
Input Source Information and Output Information
Iindicates the AC information
Indicates the DC information
Indicate input voltage, input frequency, PV voltage, battery voltage and charger current.
Indicate output voltage, output frequency, load in VA, load in Watt and discharging current.
Configuration Program and Fault Information
Indicates the setting programs
Iindicates the warning and fault codes.
Warning: flashing with warning code.
Fault: lighting with fault code.
Battery Information
Indicates battery level by 0-24%, 25-49%, 50-74% and 75-100% in battery mode and
charging status in line mode.
In AC mode, it will present battery charging status.
Status
Constant Current
mode/Constant
Voltage mode
Batteries are fully charged.
>2.167V/cell
2.083v/cell~2.167v/cell
2v/cell~2.083v/cell
<2V/cell
Battery voltage LCD Display
4 bars will flash in turns
Bottom bar will be on and the other three
bars will flash in turns.
Bottom three bars will be on and the top bar
will flash.
4 bars will be on.
Bottom two bars will be on and the other
two bars will flash in turns.
LCD Display Icons

13
In battery mode, it will present battery capacity.
Load Percentage Battery Voltage LCD Display
Load >50%
<1.717V/cell
1.717V/cell~1.8V/cell
1.8V/cell~1.883V/cell
>1.883 V/cell
<1.817V/cell
1.817V/cell~1.9V/cell
50%> Load>20%
1.9 V/cell ~1.983V/cell
>1.983 V/cell
Load<20%
<1.867V/cell
1.867V/cell~1.95V/cell
1.95V/cell~2.033V/cell
>2.033 V/cell
Load Information
Indicates overload.
Indicates the load level by 0-24%, 25-49%, 50-74% and 75-100%.
0%~24% 25%~49% 50%~74% 75%~100%
Mode Operation Information
Indicates unit connects to the mains.
Indicates unit connects to the PV panel.
Indicates load is supplied by utility power.
Indicates the solar charger circuit is working.
Indicates the DC/AC inverter circuit is working.
Mute Operation
Indicates unit alarm is disabled.

14
LCD Setting
After pressing and holding "ENTER" button for 2 seconds, the unit will enter setting mode. Press "UP" or "DOWN"
button to select setting programs. And then, press "ENTER" or "MENU" button to confirm the selection and exit.
Setting Programs:
Program Description Selectable option
00 Exit setting mode
Escape
(default)
Output source priority selection
01
Solar energy provides power to the
loads as first priority.
If battery voltage has been higher than
the setting point in program 21 for 5
minutes, the inverter will turn to battery
mode, solar and battery will provide
power to the load at the same time.
When the battery voltage drops to the
setting point in program 20, the inverter
will turn to bypass mode, utility provides
power to the load only, and the solar will
charge the battery at the same time.
Solar energy provides power to the
loads as first priority.
If battery voltage has been higher than
the setting point in program 21 for 5
minutes, and the solar energy has been
available for 5 minutes too, the inverter
will turn to battery mode, solar and
battery will provide power to the load at
the same time.
When the battery voltage drops to the
setting point in program 20, the inverter
will turn to bypass mode, utility provides
power to the load only, and the solar will
charge the battery at the same time.
Utility will provide power to the loads
as first priority. Solar and battery energy
will provide power to the loads only
when utility power is not available.
02
Appliances (default) If selected, acceptable AC input voltage
range will be within90-280VAC.
If selected, acceptable AC input voltage
range will be within 170-280VAC.
UPS
AC input voltage range
When the user uses the device to
connect the generator, select the
generator mode.
GEN

15
Output voltage
03
Set the output voltage amplitude,
(220VAC-240VAC)
60HZ
50HZ(default)
Output frequency
04
Solar supply priorit
05
(default) Solar energy provides power to charge
battery as first priority.
Solar energy provides power to the
loads as first priority.
06
Overload bypass: When enabled,
the unit will transfer to line mode
if overload occurs in battery mode.
Bypass disable(default) Bypass enable
Auto restart when overload
occurs
07
Restart disable(default) Restart enable
Auto restart when over
temperature occurs
Restart disable(default) Restart enable
Charger source priority:
To configure charger source
priority
10
Solar first Solar energy will charge battery as first
priority. Utility will charge battery only
when solar energy is not available.
Solar and Utility(default) Solar energy and utility will charge
battery at the same time.
Only Solar Solar energy will be the only charger
source no matter utility is available or
not
If this inverter/charger is working in Battery mode, only solar
energy can charge battery. Solar energy will charge battery if it's
available and sufficient.
08
If this inverter/charger is working in Line, Standby or Fault mode,
charger source can be programmed as below:
11
80A (default) 4KW 24V
Maximum charging current:
To configure total charging
current for solar and utility
chargers.(Max. charging current
=utility charging current + solar
charging current)
1-160A
5KW 24V 1-180A
4KW 48V 1-140A
5KW 48V 1-150A
6KW 48V 1-160A
8KW 48V 1-300A
10KW 48V 1-320A
12KW 48V 1-340A
13 Maximum utility charging current
30A (default) 4KW 24V 1-80A
5KW 24V 1-100A
4KW 48V 1-60A
5KW 48V 1-70A
6KW 48V 1-80A
8KW 48V 1-100A
10KW 48V 1-120A
12KW 48V 1-140A
1-200A
1-220A
1-240A

16
AGM (default)
Battery type
14
Flooded
GEL LEAD
Lithium Ion User-Defined
If "User-Defined" LI is selected, battery charge voltage and low
DC cut-off voltage can be set up in program 17, 18 and 19.
Bulk charging voltage
(C.V voltage)
17
If "User-Defined" LI is selected in program 14,this program can be
set up. Setting range is from 24.0V to 29.2V for 24Vdc model.
Increment of each click is 0.1V
24V model default setting: 28.2V
48V model default setting: 54.0V
Floating charging voltage
18
If self-defined is selected in program 14, this program can be set
up, Setting range is from 48.0V to 58.4V for 48Vdc model.
Increment of each click is 0.1V.
Low DC cut off battery voltage
setting
19
24V model default setting: 20.4V
If "User-Defined" LI is selected in program 14, this program can
be set up. Setting range is from 20.0V to 24.0V for 24Vdc model.
Increment of each click is 0.1V. Low DC cut-off voltage will be
fixed to setting value no matter what percentage of load is
connected.
If self-defined is selected in program 14, this program can be set
up. Setting range is from 48.0V to 58.4V for 48Vdc model.
Increment of each click is 0.1V.
48V model default setting: 56.4V
24V model default setting: 27.0V
If "User-Defined" LI is selected in program 14, this program can
be set up, Setting range is from 24.0V to 29.2V for 24Vdc model.
Increment of each click is 0.1V
48V model default setting: 40.8V
If self-defined is selected in program 14, this program can be set
up. Setting range is from 40.0V to 48.0V for 48Vdc model.
Increment of each click is 0.1V. Low DC cut-off voltage will be
fixed to setting value no matter what percentage of load is
connected.

17
23 Backlight control
24 Alarm control
Alarm on (default)
Backlight on Backlight off (default)
Alarm off
25 Beeps while primary source is
interrupted
Alarm on Alarm off (default)
27 Record Fault code
Record enable(default) Record disable
Solar power balance: When
enabled, solar input power will
be automatically adjusted
according to connected load
power.
Solar power balance
enable
If selected, the solar input power will
be automatically adjusted according
to the following formula: Max. Input
solar power = Max.battery charging
power + Connected load power when
the machine in OffGrid workstate.
28 Solar power balance
disable (default)
If selected, the solar input power will
be the same to max. Battery charging
power no matter how much loads are
connected. The max.battery charging
power will be based on the setting
current in program 11 ( Max. solar
power = Max.battery charging power )
If selected, the display screen will stay
at latest screen user finally switches.
20 Battery stop discharging voltage
when grid is available
Available options for 24V models:
23.0V (default) Setting range is from 22.0V to 29.0V.
Increment of each click is 0.1V.
Battery stop charging voltage
when grid is available
21
Available options for 24V models:
Setting range is from 22.0V to 29.0V.
Increment of each click is 0.1V.
27.0V (default)
Auto turn page
(default) If selected, the display screen will auto
turn the display page.
22
Available options for 48V models:
46.0V (default) Setting range is from 44.0V to 58.0V.
Increment of each click is 0.1V.
Available options for 48V models:
Setting range is from 44.0V to 58.0V.
Increment of each click is 0. 1V.
54.0V (default)