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One way to understand what we do and how Cobasys can provide the right solutions and products to solve your needs is to learn what we have done for others.

> Chevron Selects Cobasys NiGUARD NiMH Battery Backup Power Supply System for Data Center in Bellaire, Texas

> Sacramento Municipal Utility District Does Homework on Choosing NiGUARD Backup System

> Automation Alley Taps New Renewable Energy Technology

Chevron Selects Cobasys NiGUARD NiMH Battery Backup Power Supply System for Data Center in Bellaire, Texas

Chevron used an opportunity to explore alternate energy solutions at their Data Center in Bellaire, Texas (near Houston) because their lead-acid battery system was nearing end-of-life. Reclaiming valuable floor space, eliminating hazardous materials and increasing battery reliability and performance were among the reasons Chevron selected Cobasys' NiGUARD energy storage system. The NiGUARD advanced nickel metal hydride (NiMH) battery system was installed to provide efficient 24/7 protection for Chevron's uninterruptible power supply (UPS) in support of IT equipment.

The decision to use Cobasys NiMH technology as a solution offered Chevron:

  • Advanced battery chemistry
  • A compact battery system
  • More than three times the power and energy of lead-acid systems

The Cobasys NiGUARD system allowed Chevron to recover valuable floor space which had been required for the lead-acid system. The photos and layout of the Bellaire battery room now using the NiGUARD system (below) resulted in a substantial floor space savings of 65%.


Lead Acid (Flooded)
Footprint 51' (L) X 2.5' (D)
Weight 40,000 lbs.

Footprint 15.3' (L) X 2.6' (D)
Weight 10,700 lbs.

The Cobasys solution for the Bellaire UPS application consists of three NiGUARD battery strings, one for each UPS device. Each string is rated to support a 600kW load for a 15-minute run time.

The NiGUARD battery system has advanced features which promote higher reliability and minimal maintenance costs. This system incorporates advanced battery monitoring and control electronics in each NiGUARD unit to assure maximum performance, life and protection. Each unit provides a visual system status by way of front panel indicators.

Minimal maintenance is a main feature and benefit of the NiGUARD advanced energy storage system. Flooded lead-acid batteries require routine maintenance not required for NiGUARD systems. With their new NiGUARD system Chevron no longer has to be concerned with:

  • Tightening and torqueing of battery terminals
  • Removal of sulfation around battery terminals
  • Inspection of batteries for cracks and swelling
  • Battery watering
  • Battery equalizing

Box Specifications
Voltage: 48 V
Capacity: 4 kWh
Watts: 10kW/15 min
Max discharge current: 300A

The NiGUARD system integrated seamlessly with Chevron's current UPS system. The UPS is supported by three strings of NiGUARD units. Each string consists of 56 individual NiGUARD boxes connected in series and parallel. This type of configuration provides redundant backup in each string, raising the level of reliability. The series/parallel arrangement in one string can withstand the loss of several individual NiGUARD boxes and still support the load! Whereas, the loss of one battery module in the conventional lead-acid battery string meant the loss of an entire string.

The Cobasys NiGUARD system provides Chevron with an advanced NiMH battery backup system using a superior alternative to lead-acid batteries. Installing the NiGUARD system has:

  • Reduced the floor space for batteries by 65% saving 585 square feet of space for other purpose
  • Provided Chevron with an environmentally friendly advanced NiMH battery system that will provide many years of safe, reliable, and efficient standby battery protection, 24/7
  • Greatly reduced the concern of spilling or leaking hazardous materials.

Chevron now has a superior energy storage system based on advanced NiMH technology which insures an improved level of power protection and the capability to increase revenue generation and business returns on their real estate.

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Sacramento Municipal Utility District Does Homework on Choosing NiGUARD Backup System
The Sacramento Municipal Utility District (SMUD) and its forward thinking managers are like most enterprises today looking for new alternatives to correct old problems.

One issue and major concern was their existing Uninterruptible Power Supply (UPS) backup system, which was needed to protect their critical data and management systems in case of a sudden power failure or rolling blackout. The existing battery system required significant maintenance and service. There was also concern about the status of the system and its ability to discharge should a lone battery fail and break the string.

Before- Original UPS Backup System

After- NiGUARD UPS System Solution

During their analysis, SMUD discovered Cobasys' patented Nickel Metal Hydride (NiMH) technology and the NiGUARD product while at a trade conference. They decided that the NiGUARD Energy Storage System would be the answer to their concerns and chose a solution designed to provide 80kW of backup power for 15 minutes.

When asked about their decision on the rationale for choosing Cobasys and the NIGUARD system, they stated the following benefits helped make their final decision:

  • Extremely reliable when compared to existing systems
  • Clean, compact system with 66% savings in space
  • A value-added fully-integrated system reducing SMUD's worries about UPS application
  • NiGUARD included a convenient built-in monitoring and status control system
  • NiGUARD system offered virtually no maintenance
  • Lower total cost of ownership
  • Longer life cycle
  • Green, environmentally friendly system

The NiGUARD energy storage system is in place at SMUD for their critical applications and is performing to the District's satisfaction with reliability and minimal maintenance.

The Cobasys NiGUARD system is the ideal choice for applications that require high reliability in mission critical situations or demanding environments. Providing safe, environmentally responsible solutions, NiGUARD is designed to supply seamless battery backup for usage in facilities such as data centers, hospitals, airports and office environments.

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Automation Alley Taps New Renewable Energy Technology
Automation Alley, a regional technology promotion organization, received a Michigan Energy Efficiency Grant to support advanced energy efficient technologies. The goal was to find and use new energy saving technologies to reduce the national consumption of fossil fuel.

Cobasys was selected to provide its NiGUARD energy storage system solution. This solution provides Automation Alley with up to eight (8) hours to back-up their data and emergency lighting for their new headquarters facility in Troy, MI. The system was coupled with solar panels to reduce electrical demand.

The NiGUARD energy storage system offered many advantages over conventional lead battery Uninterruptible Power Supply systems (UPS), some of which are:

  • Exceptional reliability, durability and performance
  • Long cycle life
  • High power density, compact, lightweight
  • Fully managed and controlled system
  • Low cost of ownership
  • Environmentally friendly

The Cobasys NiGUARD energy storage system provided Automation Alley with the following benefits and advantages:

  • Renewable energy enabling system technology
  • Net metering capability
  • Balanced power quality
  • Cost savings and cost-effective system
  • Backup power and emergency lighting

Another UPS stationary application solution and development from Cobasys using NiGUARD Energy Storage Systems.

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U.S. Steel Requires More Energy…
To Protect Furnace from Sudden Outages

U.S. Steel Corporation - Great Lakes Works facility required a solution for their 24/7/365 Uninterruptible Power Supply (UPS) system that would provide more backup energy and time to support their current Liebert 30kVA UPS system. The Liebert system supported the Control Center overseeing their blast furnace control systems and auxiliary sensors.

While a UPS backup system can provide fifteen (15) minutes of emergency power, this was not enough time to ensure or eliminate more costly problems during the furnace's sudden power outages.

The Cobasys NiGUARD system offered an integrated energy storage system solution using Nickel Metal Hydride (NIMH) technology allowing three (3) - hours of backup power in the event of an unexpected power outage.

The NiGUARD system's additional power, 340V rated at 110kW, allows U.S. Steel ample time to complete a safe shutdown sequence of the furnace. An additional benefit of the NiGUARD system is that it also provides backup for scheduled furnace maintenance shutdowns.

The NiGUARD energy storage system was tailored to meet the needs of U.S. Steel because of the modular design, flexibility, and advanced internal battery management design and controls. The NiGUARD system allows a visual system status using front panel indicators and also allows remote monitoring via an Ethernet connection to the Control Center.

The benefits Cobasys NiGUARD energy storage system provided U. S. Steel:

  • A 12-fold increase in back-up energy and protection
  • Compact package
  • High energy density
  • Long cycle life
  • Exceptional reliability, durability and performance
  • Fully managed and controlled system
  • Integrated with existing control systems
  • Environmentally friendly
  • Cost-effective system
  • Minimal maintenance
  • Maximum run-through time

Another UPS stationary application solution from Cobasys using NiGUARD Energy Storage Systems.

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