V-TAC ESS Series Battery Pack Instruction Manual

V-TAC ESS Series Battery Pack

INTRODUCTION

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• They are trained and ready to serve you at your best.

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• DEALERS. V-TAC EUROPE LTD. BULGARIA, PLOVDIV 4000, BUL.L.KARAVELOW 9B

Purpose

• This document primarily introduces the main features, component composition, usage, installation, and maintenance of the 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.

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.

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.

Appearance

• The appearance of the V-Power S14 is shown as follows.

• The V-Power S14 dimensions are shown as follows:

Panel Introduction

• The V-Power S14 operation panel is shown as follows.

• The definition of the V-Power S14 operation panel is shown as follows.

Table 1. Operation Panel Interface Definition

3

| ****

COM 1/COM 2

| *2RJ45 Interface for communication:**

COM1 for communication with the 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 is used to identify the current capacity status of V-Power S14. The number of flashing indicators corresponds to different remaining capacities. The specific meaning is shown as follows.

Table 2. The SOC Indicator Definition

• The corresponding relationship between operation status and indicator operation status is shown as follows.

Table 3. The Run/Alarm Indicator Definition

4

| ****

Red LED ON

| Indicates an error has occurred in the battery module, which requires manual operation or consultation with VTAC for maintenance.

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

| 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| /

| 1| /
2| /
3| CAN0-H (communicate with the next battery)
4| /
5| /
6| /
7| CAN0-L (communicate with the next battery)
8| /

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 cells’ three views are shown as follows.

• Lithium-ion cell main technical specifications are shown as follows.

Table 5. Lithium-ion cell main technical specifications

11

| ****

Storage temperature

| 0-45℃（less than 1 month）；

0-35℃（less than 12 months）；

12| Operating humidity| 5%-95% RH
13| Size (WidthHighDepth)| 173.7 mm×204.6 mm×72.0 mm
14| Weight| Approx. 5.42 kg

Technical specifications

• The V-Power S14’s main technical specifications are shown as follows.

Table 6. V-Power S14 technical specifications

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.

20

| ****

External Interface

| Battery positive and negative quick plug terminals: 2P+, 2P-

Communication standard RJ45 port:2*RJ45

21| Installation method| Floor
22| Display method| Indicator light (power, operation status)
23| Size (WidthHighDepth)| 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

Installation

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.

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

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

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

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.

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

• Take out the V-Power S14 and put it in the installation place.

ATTENTION

• The V-Power S14 is heavy. If possible, please use tools to assist in handling and installation.

Plan the installation site

Table 8. Installation Space Requirement

• 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.

• Connect the ground wire to the ground.

Connecting Power Cable

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:
• A: Adjust the direction of the self-locking connector to align with the V-Power S14 terminal.
• B: Rotate the self-locking connector slightly, and it will be inserted automatically.
• C: After the self-locking connector is automatically inserted, push it in slightly, and after hearing a clicking 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.
• 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.
2. Connect the P+ & P- power cables to the inverter.

NOTE

• 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.

Connecting Communication Cable

Context

ATTENTION

• 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.
2. Connect the remaining power cables and communication cables between the V-Power S14 and inverter.
3. For the wiring diagram of the inverter to the user side, please refer to the user manual of the inverter.

NOTE

• Please confirm the usage scenarios of the inverter according to the actual situation. For details, please refer to the user manual of the inverter.
• The communication cable to the inverter contains an 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.

Operation

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

• Check whether the V-Power S14 sequence is consistent with the layout diagram.
• 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.
• Check whether the V-Power S14 are grounded.
• 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.

Power-on

Context

ATTENTION

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 is on, need to 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 the inverter;
   • Close the switch between the inverter and the 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 blinking green.
   • Waiting for the Run/Alarm indicator lights from green flashing into green, means the power on normally.
2. Multiple batteries power on in parallel:
   • Close the DC switch of the inverter;
   • Close the switch between the inverter and the power grid;
   • Close the circuit breaker between the inverter and battery (if any);
   • First closed the ON/OFF switch in the battery that used for the connection communication with an inverter, at this time the battery Run/Alarm indicator light should be flash green;
   • Wait for the battery to Run/Alarm indicator lights from green to flash into green normally on;
   • Close the ON/OFF switch of the battery that is used for connecting communication to the next battery.
   • Repeat the last step, until the last battery Run/Alarm indicator lights from green flashing into green, which 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.
4. According to the categories (1) or (2), the original battery and inverter to power on first, and make the original battery capacity is above 50%;
   • Closed the ON/OFF switch of one new expansion battery, at this time the battery Run/Alarm indicator light should flash green;
   • Wait for the battery to Run/Alarm indicator lights from green to flash into green normally on;
   • Close the ON/OFF switch of the battery that is used for connecting communication to the next battery.
   • Repeat the last step, until the finally battery Run/Alarm indicator lights from green flashing into green, which means power on normally.

Operation Guide

• The V-Power S14 has completed the system parameter settings at the factory, and the system will run automatically after power is on.
• The inverter needs to be set according to actual needs. For detailed operations, please refer to the inverter User Manual.

Maintenance

ATTENTION

• The engineering personnel who perform the following operations must have received professional training. Before operating and maintaining the V-Power S14, wear anti-static work clothes, anti-static gloves, and wrist straps, and remove conductive objects such as jewelry and watches to avoid electric shock or burns.
• All V-Power S14 internal maintenance work requires insulated tools and should be performed by personnel who have received relevant training.
• When operations such as installation and maintenance only involve the V-Power S14, the output switch of the V-Power S14 should be kept open.
• When the inverter is involved, the output switch of the V-Power S14, the DC switch of the inverter, and the circuit breaker from the inverter to the grid should be kept open.

V-Power S14 Storage

• The recommended storage temperature is 15℃~35℃.
• V-Power S14 performance degradation after long-term storage, please shorten shelf time as possible as you can.
• Charge before using to recover capacity loss of self-discharge during storage and transport.
• Storage V-Power S14 should be at 40%-50%SOC when the V-Power S14 is not used for a long time.
• Storage batteries over 40°C or under 0°C will reduce battery life. Store the V-Power S14 in a dry and low-temperature, well-ventilated place.
• If the battery is not used for a long time, the V-Power S14 must be charged at regular intervals. The charging requirements are as follows：

Table 8. V-Power S14 Charge Requirement in Storage Status

2.        Discharge by 0.2C to 0% SOC

3.        Charge by 0.2C to 40%~50% SOC

0℃~20℃ or 30℃~40℃

| ****

Every 3 months

Monthly Maintenance
Users should conduct a visual inspection of the V-Power S14 monthly. Please refer to the following table for monthly maintenance.

Table 9. Monthly maintenance

Battery appearance

| l  The appearance is neat and clean without stains.

l  The V-Power S14 terminals are intact.

l  The V-Power S14 shell is intact, and there are no bumps, breaks, or cracks around it.

l  The appearance of V-Power S14 has no leakage.

l  There is no deformation or bulging of the shell.

| l  If there is dirt on the surface, clean the V-Power S14’s appearance with a cotton cloth.

l  If the appearance is damaged, leaking, or deformed, take a photo and replace the defective V-Power S14.

l  Please contact VTAC in time for other abnormal situations.

Operation environment

| The operation environment is between 0℃-45℃.

Operation humidity range: ≤95% RH.

| If temperature and humidity are abnormal, check the indoor air conditioner status.

Quarterly Maintenance

• Please refer to the following table for the quarterly maintenance of V-Power S14.

Table 10. Quarterly maintenance

Cable

| l  There is no aging of the connecting wire and no cracking of the insulation layer.

l  The bolts at the cable connection are not loose.

| l  Replace the faulty cable.

l  Fasten the screws.

Yearly Maintenance

• It is recommended to perform trend analysis on recorded data (battery and environment).

Alarm Handling

Table12. Alarm handling

Red light flashing

| ****

Cell or battery under voltage

| ****

Check: Ensure that the communication cable between the inverter and battery is properly connected. View the battery data on the inverter display or the inverter APP.

Battery voltage≤44.8 V, or cell voltage≤2.8 V, the battery would

generated the under-voltage alarm.

Battery voltage≥57.6 V, or cell voltage≥3.65 V, battery would

generated the overvoltage alarm.

Alarm recovery: Under voltage alarm, after the battery turn to charge mode, alarm recovers; Over voltage alarm, after the battery turn to discharge mode, alarm recovers;

Cell or ambient temperature over high/low

| ****

Check: Ensure that the communication cable between the inverter and battery is properly connected. View the battery data on the inverter display or the inverter APP.

If the battery temperature≤5℃, the battery under temperature alarm is generated.

If the Battery temperature is≥45℃, the battery overtemperature alarm is generated.

Alarm recovery: When the ambient temperature ranges are from

10℃to 35℃ and the cell temperature reaches the normal range, the alarm should be automatically recovered.

Charge or discharge current overhigh

| ****

Check No visual phenomenon. If no abnormal cell voltage and temperature, the over-current alarm should be generated.

Alarm recover:

1, After the alarm is generated, the current drop and continue for 15 minutes, the alarm should be automatically recovered.

2, When the discharge current is too large, charging (No over-current) can recover the alarm;

3, When the charge current is too large, by discharging (No over-current) can recover the alarm.

Red light on

| ****

Battery fault

| ****

Check No visual phenomenon.

Alarm recovery: Shut down the battery system, wait for 5 minutes, and restart the battery. Check whether the fault can be rectified. If the fault persists, please contact the technical support engineers.

Acronyms and Abbreviations

References

• TAC.EU

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