XOLTA BAT-79 Bedienungsanleitung

Advanced energy storage system for

renewable energy and grid support applications

BAT-79 USER MANUAL

XOLTA OUTDOOR BATTERY ENERGY STORAGE SYSTEM

TABLE OF CONTENTS

1. Safety information and legal terms

1.1 Document purpose and structure ....................................................................................................................................3

1.2 Important safety Instructions ...........................................................................................................................................3

1.3 Actions in case of emergency situations ........................................................................................................................4

 1.4 XOLTAcertiedinstallers..................................................................................................................................................6

 1.5 Safedisposaloflithium-ionbatteries..............................................................................................................................6

 1.6 Disclaimer..........................................................................................................................................................................6

 1.7 Legal ..................................................................................................................................................................................6

 1.8 Copyright ...........................................................................................................................................................................6

1.9 Void of warranty ................................................................................................................................................................7

 1.10 Abbreviations ....................................................................................................................................................................7

XOLTA Battery Energy Storage System Overview

2.1 Introduction .......................................................................................................................................................................8

2.2 Hardware description .......................................................................................................................................................9

2.3 System safety ..................................................................................................................................................................10

2.3.1 Safety measures ..................................................................................................................................................10

2.3.2 InternalelectricalschemeoftheXOLTAoutdoorBESS ....................................................................................11

 2.4 Keyspecications...........................................................................................................................................................12

3. XOLTA Battery Energy Storage System

 3.1 Deliveryinspection..........................................................................................................................................................12

3.2 Location requirements ....................................................................................................................................................13

 3.3 Installationprocedure.....................................................................................................................................................13

  3.3.1Electricalrequirements........................................................................................................................................13

  3.3.2Installationoverview............................................................................................................................................14

3.4 System operation ............................................................................................................................................................18

3.5 Maintenance requirements ............................................................................................................................................18

4. XOLTA Battery System functionality

4.1 Operating modes .............................................................................................................................................................19

  4.1.1Maximizingsolarself-consumption ...................................................................................................................19

  4.1.2Externalcontrol.....................................................................................................................................................20

  4.1.3Gridvoltagesupport ............................................................................................................................................20

  4.1.4Loadfollowing......................................................................................................................................................21

 4.2 Sitecontrollerstatemachine .........................................................................................................................................21

4.2.1 SC States ..............................................................................................................................................................21

  4.2.2TransitionalSequences ........................................................................................................................................23

4.3 XOLTA outdoor BESS monitoring ...................................................................................................................................23

5. Web API

 5.1 WebAPI ...........................................................................................................................................................................24

1 SAFETY INFORMATION AND LEGAL TERMS:

1.1 Document purpose and structure

The purpose of this manual is to provide the user of the XOLTA Outdoor Battery Energy Storage System

(BESS) with an overview of system installation, functionality and operation.

The document is organized as follows:

Chapter 1 sets out important safety information, what to do in emergency situations and a list of abbreviations.

Chapter 2 gives a brief introduction to the XOLTA outdoor BESS system and describes its main features and key

 specicationparameters.SafetymeasuresandprotectionschemesusedintheXOLTAoutdoorBESSare

also described.

Chapter 3 deals with system installation, maintenance and location requirements. Liability limitations are also mentioned.

Chapter 4 describes currently available XOLTA outdoor BESS operating modes and operating states.

Chapter 5 provides a list of telemetry signals accessible via the Web API.

1.2 Important safety instructions

 TheXOLTAoutdoorBESSinstallationandservicingshouldonlybeperformedbyXOLTAcertiedinstallers.

 Inconsequence,XOLTAprovidesnoliabilityforpropertydamageorinjurycausedbysystemmodication

 orrepairsperformedbyunqualiedpersonnelorfailuretofollowthefollowingimportantsafetyinstructions.

The safety instructions have been divided into:

WARNING - indicates a dangerous situation which, if not avoided, could result in death or injury.

CAUTION - indicates a situation where damage to the equipment or injury may occur.

IMPORTANT SAFETY INSTRUCTIONS

Read the entire document carefully before installing or using XOLTA outdoor BESS.

RISK OF EXPLOSION:

Do not apply any external force to the XOLTA outdoor BESS.

Avoid physical damage to the battery. Keep the XOLTA outdoor BESS away from where it may accidentally

be physically damaged.

 DonotdisposeoftheXOLTAoutdoorBESSinre.

RISK OF FIRE:

 Keepsystemawayfromammableobjectsandheatsources.

Do not expose the battery system to temperatures in excess of 50°C.

RISK OF ELECTRICAL SHOCK:

There are high voltages present on AC and DC cables. There is a risk of death of serious injury due to electric

shock. Report any external cable/wire damage to XOLTA or local XOLTA system installer. Do not touch

uninsulated wires.

Never use a system if it is defective, damaged or broken.

Never attempt to disassemble, repair, modify the product or use it in any way other than as described in this

 manual.RepairsorreplacementofcomponentsmustonlybeperformedbyaXOLTAcertiedtechnician.

 NeverimmersetheXOLTAoutdoorBESSinwaterorotheruids.

RISK OF DAMAGE:

Do not expose the battery system to temperatures below -25°C or in excess of 50°C

Do not place any objects on top of the XOLTA BESS. It might lead to improper product operation or problems

with thermal management.

OTHER PRECAUTIONS:

The product should not be used for any purpose other than described in this manual.

Unpleasant smell might indicate electrolyte leakage from battery cell(s). In this case, switch the system off

and contact your XOLTA system supplier immediately. Ventilate the room if possible and avoid inhaling the odor.

The XOLTA outdoor BESS is heavy. Suitable lifting equipment is necessary.

Do not paint any part of the product.

For long term storage (longer than 1 month), the product should be charged to 40% SoC and then disconnected

from the grid. Observe warranty conditions.

The product must be disposed of according to local regulations.

1.3 ACTIONS in case of emergency situations

The XOLTA outdoor BESS is designed to be very safe. It monitors essential parameters of the battery system and

protects the battery from damage. The main battery safety measures are presented in Table 1.1 below.

Table 1.1:

List of main safety

measures in XOLTA

outdoor BESS

State of the art battery cells with excellent safety performance

State of the art battery management system (BMS) assuring over/under voltage and

over/under temperature monitoring for each individual battery cell

Redundant battery cut-off relay controlled by BMS

Temperature sensors monitoring battery system temperature

Active battery current control depending on battery cells temperature, voltage and state

of charge (SoC)

System diagnostics, error handling and automatic grid connection/disconnection

controlled by the site controller

Battery air humidity monitoring and condensation prevention system

AC and DC protective fuses

Despite all these built-in safety measures, emergency situations can still occur. In such emergencies, the

actions to take are as follows:

LEAKAGE

The battery pack might leak toxic electrolyte. Electrolyte is corrosive and odorous.

ACTION

• Avoid any contact with the leaking liquid or gas.

– In case of electrolyte inhalation - contact medical help.

– In case of electrolyte contact with skin - wash thoroughly with water and soap and contact medical

help.

– In case of electrolyte contact with eyes - rinse eyes with water for 15 minutes and contact medical

help.

– In case of electrolyte ingestion - force vomiting and contact medical help.

• Do not enter the room, if installed inside.

• Ventilate the room if possible.

• Contact your XOLTA system supplier.

FIRE

 Firemayoccurduetomechanicaldamageorexternalsourcesofheatandre.Hazardousfumessuchas

 carbondioxide,carbonmonoxideandhydrocarbonsareemittedduringbatteryres.

ACTION

• Disconnect the power from the battery system (if possible without getting too close to the battery and

without inhaling fumes).

 • Nevertrytoextinguishabatteryreyourself.Ifbatterycellscatchre,thenonlyqualiedreghting

  personnelwithappropriateprotectiveequipmentshouldattempttoextinguishthere.Keepawayfrom

  batteryreandcontactreghters.

 • Ifcomponentsotherthanbatterycellscatchre,thenABCorcarbondioxideextinguishercanbeusedto

  extinguishthere.

 • Keepawayfromthebatteryandcontactemergencyreghters.

IMMERSION IN WATER

Immersing the XOLTA outdoor BESS in water risks causing a short-circuit and damage to the battery system.

ACTION

• Do not try to access the XOLTA outdoor BESS.

• Disconnect the power (if possible without getting too close to the battery).

 • Neveruseaoodedbatterysystemagain.

• Keep away from the battery and contact your XOLTA system supplier.

DAMAGED BATTERY

Any sign of mechanical damage or abnormal behavior of the battery system or its peripheral components

should be treated with extreme caution.

ACTION

• Never use a damaged battery system again.

• Disconnect the power.

• Keep away from the battery and contact your XOLTA system supplier.

1.4XOLTAcertiedinstallers

XOLTA provides appropriate training to installation technicians for XOLTA systems.

 TheXOLTAoutdoorBESSmustonlybeinstalledandcommissionedbyXOLTAcertiedinstallers.Contact

 XOLTAforalistofavailableXOLTAcertiedinstallers.

1.5SafedisposalofLithium-ionbatteries

Lithium-ion batteries must be treated as hazardous waste and not be disposed of with regular waste.

A XOLTA battery which has reached the end of its functional life can be returned to the seller that originally

sold the battery or to the dealer of a new industrial battery.

1.6Disclaimer

We have taken every precaution to ensure that all information provided in this manual is correct and up to

 date.However,weassumenoresponsibilityfordamagetopersonsandpropertyarisingasaresultoffollowing

recommendations and/or procedures described in this manual. Furthermore, we assume no responsibility

for any infringements of rights of third parties which may result from the use of this manual.

1.7Legal

The system was designed to assure that an installed XOLTA outdoor BESS and all its associated function-

 alitiesbehavesafelyunderthepredenedoperatingconditions.However,please,readallsectionsdescribing

safety issues and precautions carefully before installation, operation, or performing service work on a XOLTA

outdoor BESS. Failure to do so could result in reduced system performance, damage to the system, personal

injury or even death.

1.8Copyright

in this manual at any time without notice. This manual may be photocopied or otherwise distributed only to

the extent that is necessary for the correct operation and installation of XOLTA outdoor BESS.

1.9 Void of warranty

XOLTA does not assume any direct or indirect liability for any damage or loss caused if:

• The product covered is not continuously connected to the internet via LAN cable, meaning that XOLTA

cannot monitor the performance of said product;

• The product covered has not been stored, transported, set up or installed in an appropriate and professional

manner in accordance with technical standards and regulations, in accordance with the relevant installation

manual of the product or the instructions of XOLTA;

• The product covered has been operated contrary to its intended use or contrary to the instructions in the

relevant installation manual;

• The product covered was out of service for a continuous period of more than six months after the initial

installation due to the fault of the Purchaser;

• The product covered has not been serviced properly and professionally according to technical standards

or XOLTA’s maintenance instructions;

 • Theproductcoveredhasbeenexposed,eventemporarily,tovibrationsthateveninsignicantlyexceed

the usual extent of vibrations caused by transport and installation;

• The product covered has been improperly altered or otherwise tampered with by the Purchaser or any

third party;

• An overvoltage has occurred in the power grid to which the product covered is connected;

 • Theproductcoveredhasbeenexposedtoforcemajeure(inparticularlightning,re,earthquakeornatural

disaster) or harmful environmental conditions such as air pollution, salt water or sulphur corrosion;

NOTE! Always refer to the Terms and Conditions document delivered by XOLTA for warranty conditions.

1.10Abbreviations

Table 1.2:

List of abbreviations

used in this XOLTA

User Manual

BESS Battery Energy Storage System

BMS Battery Management System

BoL Beginning of Life

BPU Battery Protection Unit - a unit containing switches and fuses for battery protection

CAN Controller Area Network - Serial communication protocol developed by Bosch

CMU Cell Monitoring Unit of nBMS

DoD Depth of Discharge

EoL End of Life

ESS Energy Storage System

GUI Graphical User Interface

MCU Main Control Unit of nBMS

MODBUS Serial communication protocol developed by Modicon

n-BMS Battery Management System from Lithium Balance A/S

NTC NegativeTemperatureCoefcientthermistor

PCS Power Conditioning System

POR Power on Reset

PV Photovoltaic

SC Site Controller

SoC State-of-Charge

TCO Total Cost of Ownership

TMS Thermal Management System

2 XOLTA BATTERY ENERGY STORAGE SYSTEM OVERVIEW:

2.1 Introduction

The XOLTA outdoor BESS is a modular, cloud-connected multipurpose stationary energy storage system.

The BESS was designed for a wide range of ambient temperature conditions which makes it suitable for

outdoor installation without any additional enclosure. The system is designed for various operation modes

(applications) which will be further described in Chapter 4.

The main features of the XOLTA outdoor BESS are:

• PLUG AND PLAY: Simple installation and commissioning. The system requires grid connection, internet

and electric meter connections.

• ALL IN ONE: All components of the system are integrated into a single cabinet. This includes the battery

cells, the power conditioning system (PCS), the thermal management system (TMS), the battery management

system (BMS), the multi battery rack control system and the energy management system.

• OUTDOOR OPERATION CAPABILITY: The mechanical casing of the system was designed to be effective

up to enclosure rating IP55 (dust and water jet ingress).

 • MODULARITY:Thestoragesystempowerandenergycanbeexpandedandtailoredtospecicneeds.Intotal,

up to 32 XOLTA battery racks can be connected and operated in parallel providing up to 1MW and 2.5MWh.

• MULTIPURPOSE: The system is designed for various applications, from the integration of renewable energy

(e.g. increasing renewable self-consumption) up to various grid support applications (e.g. frequency and

voltage support).

• XOLTA CLOUD CONNECTION: The system is integrated with the XOLTA Cloud. It allows for system monitoring,

advanced control, data acquisition, and data storage.

• SAFETY: The system is designed to offer exceptionally high operational safety. For example, the system is

  ttedwithstate-of-the-artbatterysystems,multi-layerandredundantprotectionsystems,LithiumBalance’s

battery management system (BMS) which assure maximal system safety under various operating conditions.

 • LOWTOTALCOSTOFOWNERSHIP:Thisisachievedbyveryhighsystemround-tripefciency,lowstandby

losses, minimal operational and maintenance (O&M) cost and intelligent energy management.

• SITE CONTROLLER: This works as a multi battery rack control system and an energy management

system (EMS) which manages the entire XOLTA outdoor BESS. It provides charge/discharge power

management, monitoring to assure safe system operation, communication with all system peripherals

(e.g. the battery converter), data acquisition, communication with the XOLTA Cloud, system diagnostics

and error handling.

 • THERMALMANAGEMENTSYSTEM:Simpleandefcientparallelcoolingsystem.

 • PERIPHERALS:Possibilityofintegratingexternalenergymetersandother.

2.2 Hardware description

In this section, different hardware components of the XOLTA outdoor BESS are described. Figure 2.1 presents

the schematic drawing of the XOLTA outdoor BESS.

Each rack (battery cabinet) of the XOLTA outdoor BESS consists of eight serially connected battery packs

(as seen in Figure 2.1. All battery cells are protected by Lithium Balance’s n-BMS.

Figure 2.1:

Illustration of the

XOLTA outdoor

BESS hardware

components

Conv+

Conv-

Modbus TCP

L+N+PE

3L+PE

Ethernet

RJ45

Ethernet

RJ45

PCS

Conv+

Conv-

PCS

L+N+PE

3L+PE

BMS Low

BMS High

BMS Low

BMS High

BMS Low

BMS High

BMS Low

BMS High

BMS Low

BMS High

BMS Low

BMS High

BMS Low

BMS High

BMS Low

BMS High

Thermal management system

BESS Rack 1

BESS Rack N

BAT +

PCS+

PCS-

PCS+

PCS-

BAT-

BAT +

Modbus TCP

Thermal management system

BMS Low

BMS High

BMS Low

BMS High

BMS Low

BMS High

BMS Low

BMS High

BMS Low

BMS High

BMS Low

BMS High

BMS Low

BMS High

BMS Low

BMS High

BAT-

Figure 2.2:

Illustration of the

XOLTA outdoor BESS

BPU front view

Each XOLTA outdoor BESS has a battery protection unit (BPU). Figure 2.2 is an illustration of the BPU

consisting of a communication section and a power section.

The site controller is installed in the BPU and is connected to the XOLTA Cloud using the Ethernet port shown

in Figure 2.2. The Ethernet port ensures communcation between neighboring racks if operating in unison.

The site controller communicates with Lithium Balance’s n-BMSs via the CAN bus.

The DB9 Modbus port is used for communication with peripherals (e.g. energy meters).

The RJ45 port marked SPI is used for communication between the n-BMS MCU and the n-BMS CMUs (which

are located in battery packs). An additional DB15 plug is used for activation of the thermal management

system, sensing outdoor air temperature, LED diodes control and communication with the humidity sensor-

The Modbus TCP port is used for communication with the power conditioning unit (PCS) and communication

with neighboring racks if operating in unison.

The BPU is powered by single phase 230V AC and is protected by a 1.5A fuse located in the power entry connector.

2.3 System safety

2.3.1 Safety measures

The XOLTA outdoor BESS is protected by Lithium Balance’s state of the art n-BMS. The system

monitors essential parameters of the battery system (cell voltage, current, temperature) to

ensure safe operation. The n-BMS also monitors the battery main parameters, e.g. State of Charge

(SoC) and performs battery cell balancing to ensure maximal energy utilization and performance.

The XOLTA outdoor BESS is equipped with a battery protection unit (BPU) which protects the

battery and the inverter from conditions which can be detrimental to the BESS. It includes redundant

relays controlled by the n-BMS and redundant fast battery fuses.

In addition, in order to assure system longevity and safe operation (maintaining correct operating

temperatures), each of the XOLTA outdoor BESS battery packs is equipped with 12 temperature

sensors (two sensors per battery module). These give a total of 96 temperature sensors per battery

rack. This number of temperature sensors allows for quick detection of local temperature gradients

and thus ensures system safety and equal cell performance during the system lifetime. Furthermore,

temperature sensors are located on all battery safety-related PCBs

The thermal performance of the XOLTA outdoor BESS is also monitored by the site controller and

allows for power/current derating whenever the cell temperature or the ambient temperature is

outside a strictly determined range. The site controller also allows for converter error handling and

automatic connection/disconnection of battery racks.

NTC, LED,

thermal

management

B AT-

BAT+

CAN

Modbus RTU

Power

entry port

SPI

INV+

INV-

Ethernet

Modbus TCP

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