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Energy storage systems

xStorage battery energy storage system

The xStorage battery energy storage system (BESS) optimizes energy usage and supports energy storage, electric vehicle integration and grid modernization. In the event of a utility power interruption, the xStorage BESS provides an environmentally friendly backup, reducing reliance on traditional generators with its 250 to 1000 kWh of usable stored energy. Additionally, it enables efficient solar self-consumption by storing excess energy from on-site sources like solar panels, and supports demand response by using stored energy to manage peak demands and avoid utility fees. The xStorage system includes a control cabinet with auxiliary transformer, power conversion system (PCS)/inverter and up to three battery cabinets, each housing six or eight battery modules, while predictive 24x7 monitoring and management proactively identifies risks and reduces downtime.

Experience xStorage

Battery energy storage systems (BESSs) play an important part in creating a next-generation electrical infrastructure that encompasses microgrids, distributed energy resources (DERs), DC fast charging, Buildings-as-a-Grid and backup power free of fossil fuels for buildings and data centers.

Navigate through this interactive to learn more about the capabilities and benefits of xStorage.

Versatile energy storage for all

The xStorage BESS holds 250 to 1000 kWh of usable stored energy and provides support for energy storage, EV integration and grid modernization. The ability to avoid peak usage charges from utilities helps reduce energy costs for businesses, government and military agencies, schools, industrial plants and healthcare facilities. Watch this video to learn more about xStorage.

xStorage image gallery

Stay in control

Eaton's predictive 24x7 monitoring and management service proactively identifies component risks, reduces downtime and expedites critical alarm response for xStorage.

xStorage FAQs

The xStorage BESS can provide backup power (i.e. maintaining the load when disconnected from the grid). xStorage BESS is also capable of “black start.” However, battery energy storage systems are open transition and do not provide fast switching in the way that UPS systems do and should not be viewed as a UPS replacement. If uninterrupted power is required, a UPS should be used in conjunction with the BESS to support the critical loads.
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The built-in peak shaving function of the xStorage BESS only supports static peak shaving limits. A higher-level controller, such as Eaton’s Power Xpert microgrid controller, could be used to determine the proper peak shaving setpoints based on battery state of charge and send these setpoints to the BESS through the communication interface.
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There is an internal UPS in the control cabinet to provide backup to the communication and monitoring functions if utility power is lost. The available power is limited by the length of the outage and the level of charge in the battery.
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Right now only aggregate information for the system is readily available. Details can be found in the various customer-facing interfaces: local web apps, cloud-based web apps (remote monitoring) and local and remote Modbus servers.
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The xStorage BESS logs all faults, warnings and events of the system locally and displays immediate alarms and current operational events in the customer’s remote monitoring web interface. The local storage has a running 6 GB capacity.
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A 480V-480V double-shielded isolation transformer with Wye (primary) – Delta (secondary) is recommended (available from Eaton; ask your Eaton sales representative for more information). The transformer is required to meet IEEE 1547.4 standards for maintaining the grounding scheme on an island system, preventing or limiting conducted emissions and reducing noise transmission for DC ground fault detection.
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The xStorage BESS has the following seismic analysis validation:

  • Power conversion system (PCS) is rated to ICC-ES AC 156 Sds @ 1.35 G
  • Battery cabinet is rated to IEEE 693-2018
  • Control cabinet is tested to AC 156 Sds @ 2.0 G
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In the very unlikely event of thermal runaway, smoke or fire, the system will operate as follows:

  • The control cabinet has an integral fire control panel. Upon signal transmission, a fire suppression agent (Novec 1230 Fire Protection Fluid) is released to reduce damage to the battery cabinets.
  • Upon receiving a critical alarm signal from the batteries (smoke/fire detection), the system will immediately notify a pre-determined contact at a local fire station and send a notice to the customer through the remote monitoring web interface.
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The inverter and battery racks independently monitor and self-protect in the event of a critical fault or warning. The stored energy controller adds a layer of monitoring and protection that will shut down the BESS upon loss of signal, fault or critical battery failures (smoke/fire detection). The system inherently cannot operate without a “heartbeat” signal from the components; therefore, loss of communication will shut down the system and all services that were running. (It will not cause blind energy services.) The system has local disconnect methods as well, including a functional emergency stop (E-stop) push button on the front door of the inverter that opens the internal AC and DC contactors, preventing high voltage from flowing between the grid and batteries.
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The integrated xStorage BESS is TAA compliant. The control cabinet and power conversion system (PCS) are Buy America compliant. The batteries are sourced from outside the United States.
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The xStorage BESS has a design life of 10+ years. A 95% to 5% depth of discharge at one cycle daily should result in 10+ years of life. Multiple partial discharges per day, extreme ambient temperatures and lower than 5% depth of discharge will affect battery degradation.
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Specifications

xStorage technical specifications

BESS rating

Power rating 250 to 1000 kW
Energy rating 250 to 1000 kWh

AC characteristics

Nominal Voltage (+/- 10%) 480 VAC 3Ph/3W
Aux power 208 VAC 1Ph
Max fault current allowed from AC source 180 kAIC
Power factor 100% active to 100% reactive
Input current distortion <3%
Peak efficiency 98.8%
Overload (@40oC and >65% full load) 116% for 5 min.; 120% for 3 sec.

DC characteristics

DC voltage (nominal) 761 to 1200 VDC
DC voltage (maximum) 720 to 1500 VDC
Minimum battery voltage 1.65 x nominal VAC
Max fault current allowed from DC source 180 kAIC

Battery cabinet (each)

Battery type Lithium iron phosphate 
Battery voltage 1165 to 1498 VDC
Rated energy 373 kWh

General characteristics

Ambient Temperature (operating) -20°C to 50°C (-4°F to 122°F), derating >40°C (104°F)
Ambient Temperature (storage) -40°C to 60°C (-40°F to 140°F)
Humidity 5 to 95% non-condensing
Protection Nema type 3R (IP54)
Cooling (PCS/Batteries cabinets) Liquid cooled
Cooling (Control cabinet) Air cooled
Audible noise <75dBA @ 3 m
Altitude (max) 1000m @ 40oC (104°F) without derating
Installation Pad mount or skid mount

Dimensions and weights (480V system)

Control cabinet 53.5" w x 58.5" d x 68.9" h 1014 lb.
PCS/Inverter 39.9" w x 64.6" d x 87.6" h 3173 lb.
Battery cabinet (each) 50.9" w x 51.6" d x 89.8" h 7830 lb.

Available modes of operation

Peak shaving
Time-of-use optimization
Demand response
Backup power
Islanding
Solar self-consumption
Aggregation services

References

System UL 9540
Power conversion system UL 1741 SA, SB
Battery UL 1973, UL9540A
Other ISO9001

Communications

Modbus TCP/IP

Service

Startup Standard
24 x 7 dispatch call center for service needs Standard
User remote monitoring and control Standard
Service plans (remote or onsite) Optional
Predictive analytics remote monitoring and service Future
Due to continuing improvements, specifications are subject to change without notice.
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