V-TAC ESS Series User manual

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5
INSTRUCTION MANUAL
ESS SERIES BATTERY PACK
INTRODUCTION
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About This Document
Purpose
This document primarily introduces the main features, component composition, usage, installation, and
maintenance of Wall-mounted Residential Energy Storage System VE51280W (short for V-Power S14).
Intended Audience
This document is intended for:
Hardware installation engineers
Technical support engineers
Maintenance engineers
Users
Symbol Conventions
The symbols that may be found in this document are defined as follows.
Symbol Definition Remarks
Danger Indicates a hazard with a high level of risk which, if not avoided, will
result in death or serious injury.
Warning Indicates a hazard with a medium level of risk which, if not avoided,
could result in death or serious injury.
Attention Indicates a hazard with a low level of risk which, if not avoided,
could result in minor or moderate injury.
Note
Supplements the important information in the main text.
NOTE is used to address information not related to personal injury,
equipment damage, and environmental deterioration.
Change History
Changes between the issued documents are cumulative. The latest document issued contains all the
changes made in earlier versions.
Issue 01 (2023-01-31)
This issue is the first official release.
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Contents
About This Document ..................................................................................................................1
1Introduction ..........................................................................................................................3
1.1 Application ........................................................................................................................................... 3
1.2 Appearance .......................................................................................................................................... 3
1.3 Panel Introduction................................................................................................................................ 4
1.4 PIN Definition ....................................................................................................................................... 6
1.5 Lithium-ion Cell .................................................................................................................................... 7
1.6 Technical specifications ........................................................................................................................ 8
2Installation ..........................................................................................................................10
2.1 Precautions for Installation ................................................................................................................ 10
2.2 Preparing for Installation.................................................................................................................... 10
2.2.1 Tools ............................................................................................................................................................... 10
2.2.2 Packing List..................................................................................................................................................... 11
2.2.3 Unpacking Acceptance................................................................................................................................... 12
2.3 Installing Guide................................................................................................................................... 12
2.4 Connecting Power Cable .................................................................................................................... 13
2.5Connecting Communication Cable ..................................................................................................... 16
3Operation............................................................................................................................18
3.1 Check before Power-on...................................................................................................................... 18
3.2 Power-on ............................................................................................................................................ 18
3.3 Operation Guide ................................................................................................................................. 19
4Maintenance .......................................................................................................................21
4.1 V-Power S14 Storage .......................................................................................................................... 21
4.2 Monthly Maintenance........................................................................................................................ 21
4.3 Quarterly Maintenance ...................................................................................................................... 22
4.4 Yearly Maintenance............................................................................................................................ 22
4.5 Alarm Handling................................................................................................................................... 22
Acronyms and Abbreviations......................................................................................................24
2

1Introduction
1.1 Application
V-Power S14 is a next-generation product developed by VTAC, which is used in residential energy
storage solutions. This battery system has a capacity of 14.336 kWh.
V-Power S14 integrates the high-performance BMS. To extend battery life, it has multiple protection
functions such as system over-charge, system over-discharge, cell over-voltage, cell under-voltage,
charging over-current, discharging over-current, and insulation fault. It also has RS485 and CAN
communication to read battery module’s real-time data.
1.2 Appearance
The appearance of the V-Power S14 is shown as follows.
Figure 1. V-Power S14 appearance
The V-Power S14 dimensions are shown as follows:
3

Figure 2. V-Power S14 dimensions (unit: mm)
1.3 Panel Introduction
The V-Power S14 operation panel is shown as follows.
Figure 3. V-Power S14 operation panel
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The definition of the V-Power S14 operation panel is shown as follows.
Table 1. Operation Panel Interface Definition
No. Items Remark
1 SOC State of Charge.
2 RUN/ALM Indicate battery module running or alarm status.
3 COM 1/COM 2
2*RJ45 Interface for communication:
COM1 for communication with inverter or the next battery;
COM2 for communication with the next battery.
4 Output connectors Battery module output connectors.
5 GND Grounding.
6 POWER Power Switch.
7 Bracket Mounting bracket.
The SOC indicator used to identify the current capacity status of V-Power S14. The number of flashing
indicators corresponds to different remaining capacity. The specific meaning is shown as follows.
Table 2. The SOC Indicator Definition
No. Indicator Light Remark
1 0% < SOC ≤25%
2 25% < SOC ≤50%
3 50% < SOC ≤75%
4 75% < SOC ≤100%
The corresponding relationship between operation status and indicator operation status is shown as
follows.
Table 3. The Run/Alarm Indicator Definition
No. Indicator Light Definition
1 Green LED Flash Indicates the V-Power S14 is charging or discharging.
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No. Indicator Light Definition
2 Green LED ON Indicates the V-Power S14 is in standby mode.
3 Red LED Flash Indicates the V-Power S14 is in alarm mode.
4 Red LED ON Indicates an error has occur in the battery module, which requires manual
operation or consultation with VTAC for maintenance.
1.4 PIN Definition
V-Power S14 has 2 communication interfaces: COM1 and COM2, the PIN definition of COM ports is
shown as follows.
Table 4. The Communication Port Definition
COM1/2 Pin Description
COM 1
1 RS485_B
2 RS485_A
3 CAN0-H (communicate with the next battery)
4 CAN1-H (communicate with inverter)
5 CAN1-L (communicate with inverter)
6 GND_RS485
7 CAN0-L (communicate with the next battery)
8 /
COM 2
1 /
2 /
3 CAN0-H (communicate with the next battery)
4 /
5 /
6 /
7 CAN0-L (communicate with the next battery)
8 /
6

1.5 Lithium-ion Cell
The lithium iron phosphate cell selected in the scheme is a special energy-type lithium battery product.
This series of lithium iron phosphate cells have high specific energy, longer cycle life, low cost, capable of
high current charge and discharge, high-temperature tolerance, high energy density, safety, and pollution-
free features.
Lithium-ion cell's three views are shown as follows.
Figure 4. Lithium-ion cell three views (unit: mm)
Lithium-ion cell main technical specifications are shown as follows.
Table 5. Lithium-ion cell main technical specifications
No. Items Parameter
1 Battery type LiFePO₄
2 Rated voltage 3.2 V
3 Rated capacity 280 Ah
4 Rated energy 0.896 kWh
5 Max continuous charge current 200 A
6 Max continuous discharge current 200 A
7 Charging cut-off voltage 3.65V
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No. Items Parameter
8 Discharging cut-off voltage 2.80 V
9 Operating charging temperature 0℃-50℃
10 Operating discharging temperature -20℃-55℃
11 Storage temperature
0-45℃（less than 1 month）；
0-35℃（less than 12 months）；
12 Operating humidity 5%-95% RH
13 Size (Width*High*Depth) 173.7 mm×204.6 mm×72.0 mm
14 Weight Approx. 5.42 kg
1.6 Technical specifications
The V-Power S14's main technical specifications are shown as follows.
Table 6. V-Power S14 technical specifications
No. Items Parameter
1 Model VE51280W
2 The number of cells 16
3 Cells in series and parallel 1P16S
4 Rated voltage 51.2 V
5 Rated capacity 280 Ah
6 Rated energy 14.336 kWh
7 Charging cut-off voltage 57.6 V
8 Discharging cut-off voltage 44.8 V
9 Max continuous charge current 200 A
10 Max continuous discharge current 200 A
11 Communication method CAN/RS485
12 Maximum number of modules
allowed to be connected in parallel
Parallel expandable, ≤ 8 groups, without derating
More than 8 groups need to be derated.
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No. Items Parameter
13 Storage temperature 0℃~ 45℃
14 Operating temperature Discharge -20℃~ 55°C, Charge 0°C ~50℃
15 SOC estimation value <8%
16 Allowable relative humidity 5% ~ 95% Non-condensing
17 Altitude 2000m without derating
18 Cooling method Natural heat dissipation
19 Protection level IP65
20 External Interface
Battery positive and negative quick plug terminals:
2*P+, 2*P-
Communication standard RJ45 port:2*RJ45
21 Installation method Floor
22 Display method Indicator light (power, operation status)
23 Size (Width*High*Depth) 505.0 mm×801.5 mm×251.0 mm (without base)
24 Net weight Approx. 121 kg
Protection function
25 Over-voltage protection System over-voltage, cell over-voltage
26 Under-voltage protection System under-voltage, cell under-voltage
27 Over-current protection Charging over-current, discharging over-current
28 Temperature protection
Charging high temperature, charging low temperature,
discharging high temperature, discharging low
temperature
29 Short circuit protection BMS hardware protection, external fuse
30 Reverse connection protection Available, when it is powered off
31 Dielectric withstand test Available
32 Pre-charge function Available
33 Equalization function Available
34 Hibernation function Available
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2Installation
2.1 Precautions for Installation
Light intensity is required near the installation location.
Comply with the safety operation technical regulations when lifting and handling heavy objects.
Equipment and tools must be complete, intact, and reliable. It is strictly prohibited to use tools with
cracks, burrs, loose handles, etc., that do not meet the safety standards.
Installation operations must be guided by qualified engineers.
During installation, two people must work together, one operating and the other inspecting.
The original cable connection and operation process shall not change without the authorization of
the company's consent.
2.2 Preparing for Installation
2.2.1 Tools
Insulated installation tools must be used to prevent electric shocks. If tools without insulation protection
are used, the exposed metal parts must be wrapped and insulated with insulating tape.
The following table shows tools that need to be prepared before installation.
Table 7. Tools
Electric screwdriver Manual forklift Electric forklift Impact drill
Levelling instrument Socket wrench Phillips screwdriver Insulated torque wrench
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Tape measure Adjustable wrench Torque wrench Claw hammer
Diagonal pliers Clamp meter Multimeter Anti-static gloves
Helmet Goggle Insulation shoes Insulating tape
2.2.2 Packing List
Open the package and take out the product, please check the accessories first. The packing is shown
below.
Figure 5. Accessories of V-Power S14
Item Description Quantity
A
Wall-mounted battery module 1
Wall-mounted bracket or floor bracket (*Optional) 1
B
Communication cable 1
Positive/Negative power cable (*Optional) 2
C
Expansion screw 2
Cross groove outer hexagon combination screw 2
D User manual 1
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2.2.3 Unpacking Acceptance
After receiving the goods on-site, please check whether the packing box is intact and inspect the goods
in time. If the packing box is slightly damaged, please sign the cargo list to confirm receipt and indicate
the extent of the damage. If the damage of the packing box is serious, please refuse to sign.
Please carry out an unpacking inspection after receiving all the goods. If users find that the received
goods do not match the packing list, please contact VTAC as soon as possible.
2.3 Installing Guide
Context
Before installing the V-Power S14, users need to plan the installation site. The installation site should
comply with the following conditions:
The installation site should be able to place one V-Power S14, and there should be a wall to mount
the inverter.
A 500 mm ventilation and operation space should be reserved at the right of the V-Power S14.
If possible, the installation site should be as spacious and ventilated as possible. If the site is small
and confined, please configure auxiliary heat dissipation equipment.
Procedure
1 Take out the V-Power S14 and put it in the installation place.
The V-Power S14 is heavy. If possible, please use tools to assist in handling and installation.
2 Plan the installation site.
Figure 6. Installing V-Power S14
Table 8. Installation Space Requirement
Position Min. distance
Left-side 200mm
Right-side 300mm
Bottom 300mm
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3 Using a drill and level, mount the bracket to the selected wall. Check whether the bolt torque of the
nuts (2 nuts on the back of V-Power S14) is 8 N.m. Mount the V-Power S14 on the bracket.
4 Connect the ground wire to the ground.
Figure 7. V-Power S14 grounding
2.4 Connecting Power Cable
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Context
1
、
Insulate installation tools to prevent electric shocks.
2
、
According to the power value of the inverter, the power cable should be connected. If multiple batteries are used in
parallel, the power cables should be connected according to the wiring mode in Figure 9.
The V-Power S14 power cable connection method adopts a self-locking connector. The description of
the self-locking connector is shown as follows:
The steps for connecting the self-locking connector are as follows:
AAdjust the direction of the self-locking connector to align with the V-Power S14 terminal.
BRotate the self-locking connector slightly, and it will be inserted automatically.
CAfter the self-locking connector is automatically inserted, push it in slightly, and after hearing a
click sound, the self-locking connector and the battery module terminal are connected.
Need to press the buttons on the self-locking connector simultaneously when users need to pull
out the self-locking connector.
Figure 8. Self-locking connector button
If there are multiple V-Power S14 in parallel, you need to connect them in parallel using the parallel power
cables, then connect the power cable to the inverter. Please pay attention to the distinction between
battery modules’ positive and negative terminals.
Procedure
1 Connect the internal power cables of V-Power S14.
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Figure 9. Connect the internal cables
2 Connect the P+ & P- power cables to the inverter.
Figure 10. Connect the external cables
The self-locking connector's color should correspond to the V-Power S14 terminal's color: orange corresponds to
the positive pole, and black corresponds to the negative pole.
Please take care of the removed V-Power S14 protective cover in case of backup.
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2.5 Connecting Communication Cable
Context
Please pay attention to the direction when plugging the communication cable connector, do not operate violently.
Communication cables and power cables must be routed separately.
If there are multiple V-Power S14 in parallel, you need to connect the communication cables in parallel
first. Then you need to connect the communication cable of the inverter to COM1 of any V-Power S14.
Procedure
1 Connect the internal communication cables of the V-Power S14.
Figure 11. Connect the internal cables
2 Connect the remaining power cables and communication cables between the V-Power S14 and
inverter.
Figure 12. Connect the external cables
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3 For the wiring diagram of the inverter to the user side, please refer to the user manual of inverter.
Please confirm the usage scenarios of the inverter according to the actual situation. For details, please refer to the
user manual of inverter.
The communication cable to the inverter contains L&N cable (220V power supply for BMS). Please connect this cable
to the output port of the inverter. (Optional)
Recommended open-circuit current from the battery to the inverter: rated operating current 250A, rated operating
voltage ≥DC110V, rated short circuit breaking capacity ≥25kA (DC110V). If the inverter has instructions, the inverter
shall prevail.
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3Operation
3.1 Check before Power-on
Context
After installing the V-Power S14, users need to perform a pre-power check to ensure that the device
installation and cable connection are correct before performing the power-on operation.
Procedure
1 Check whether the V-Power S14 sequence is consistent with the layout diagram.
2 Check the cable connection on site.
Check whether the cables are connected correctly, whether the connectors are firm, and
whether the self-locking connector is tightly connected.
Check whether the communication cable and the power cable are separated.
3 Check whether the V-Power S14 are grounded.
4 Check the switch status.
The DC output switch of the V-Power S14 are open.
The DC switch of the inverter is open.
The circuit breaker from the inverter to the grid is open.
3.2 Power-on
Context
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1. Before performing the power-on commissioning on the V-Power S14, users must strictly perform the pre-power-
on check.
2. All batteries are equipped with 50% capacity.
Prerequisites
Before power on, need ensure that all power cables and communication cables are connected well.
Procedure
Battery power on is divided into three categories: (1) One single battery power on (no parallel connection),
(2) Multiple batteries power on in parallel, (3) Batteries expand power on in parallel.
1 One single battery power on (no parallel connection):
Close the DC switch of inverter;
Close the switch between the inverter and power grid;
Close the circuit breaker between the inverter and battery (if any);
Closed ON/OFF switch of battery;
The Run/Alarm indicator should be blinks green.
Waiting for the Run/Alarm indicator lights from green flashing into green, means power on
normally.
2 Multiple batteries power on in parallel:
Close the DC switch of inverter;
Close the switch between the inverter and power grid;
Close the circuit breaker between the inverter and battery (if any);
First closed the ON/OFF switch in battery that used for the connect communication with inverter,
at this time the battery Run/Alarm indicator light should be flash green;
Wait for the battery Run/Alarm indicator lights from green flashing into green normally on;
Close the ON/OFF switch of the battery that used for connect communication to the next battery.
Repeat the last step, until the last battery Run/Alarm indicator lights from green flashing into
green, means power on normally.
3 Batteries expand power on in parallel:
Power off the original battery and inverter, and connect the newly expanded battery power cable
and communication cable in parallel according to 2.4 and 2.5.
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