energy storage system

Emergency power supply – a comprehensive buying guide

Emergency power supply - A comprehensive buying guide
This article introduces the relevant knowledge and using guide of emergency power supply.
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    What is emergency power supply?

    In a power outage, an emergency power supply(EPS) provides power to essential systems and equipment to keep them operational. An emergency power supply helps industries such as data centers, hospitals, and telcos maintain function during unforeseen power outages and emergencies.

    How many types of emergency power are there?

    According to the input method, EPS emergency power supply has various specifications and can be divided into single-phase 220V and three-phase 380V;

    According to the output mode, EPS can be divided into single phase, three phase and single, three phase mixed output;

    There are three kinds of installation forms: floor type, wall hanging type and embedded wall type. Capacity ranges from 0.5kW to 800kW;

    According to the service object, emergency power supply can be divided into power load and emergency lighting. Its standby time is generally 90 to 120 minutes. If there are special requirements, it also be configured according to the design requirements of the standby time. Therefore, EPS emergency power supply can meet the needs of our general engineering.

    What requires emergency power?

    Industries that require continuous operation usually require emergency power to keep their function.

    Here are some industries that use emergency power for their daily operations:

    • Healthcare (life support systems, medical imaging equipments, monitoring systems, critical care units)
    • Data Centers (networking equipment, cooling systems, security systems, data storage, communication systems)
    • Manufacturing (quality control equipment, inventory management system, production lines)
      Telecommunication (cellular towers, base stations, ISP infrastructure, network routers)
    • Residential (medical equipment for home care patients, communication devices, refrigeration for food storage, home security systems)

    What Requires Emergency Power?

    What is the emergency power supply for buildings?

    Emergency power supplies for buildings are critical to ensure that operations of essential systems continue during power outages.

    • Provide instant backup power through batteries.
    • Mostly used for short periods or bridges the gap until the backup generator engages.
    • Used commonly on telecommunications, critical medical equipment, and computer systems.
    • Can also function as protection for power surges and fluctuations.

    What is the emergency power supply on a ship?

    Emergency power systems on ships are used for lighting, navigation systems, radio equipment, watertight doors, and other necessary systems, which is crucial to maintain safety, provides instant power supply during outages and are relatively easy to maintain.

    What Is the Emergency Power Supply on a Ship

    What is the emergency power supply for home?

    Emergency power supplies for homes ensure that appliances and safety systems remain operational during grid outages. For example, emergency power supply can provide short-term power to sensitive electronic devices such as computers and household appliance.

    Introduce EPS system components and how does an EPS work?

    To understand how an EPS system works, it’s important to know its components first.

    • Power Source – provides emergency power, usually through lithium battery backup systems. It’s also the most important part of an EPS.
    • ATS (Automatic Transfer Switch) – this monitors the main power supply (grid) and automatically switches the load to emergency power when it detects power failure or blackout.
    • Control Systems – manages the entire operating of an EPS, ensuring activation and deactivation of the battery packs. It also monitors the health and performance of the EPS.
    • Load Management – handles power distribution of EPS. It usually prioritizes critical systems to receive power first and limit power usage of non-essential loads.

    EPS System Flow

    • During normal operation, the ATS (Automatic Transfer Switch) continuously monitors the main power supply (grid) for any interruptions.
    • When the ATS (Automatic Transfer Switch) detects a power failure or voltage drop, it starts the emergency power system, including starting the generator or engaging the UPS (if available).
    • After initializing the emergency power supply, the ATS (Automatic Transfer Switch) transfers the load to the backup power.
    • The Load Management system monitors the distribution of backup power and ensures that critical systems remain operational before supplying power to non-essential load.
    • The ATS (Automatic Transfer Switch) continuously monitors the main power supply.
    • Once the main power supply is restored, the ATS (Automatic Transfer Switch) switches the load from the emergency power supply back to the main supply.
    • Generators and other backup power sources enter a cooldown phase before it shuts down.
    • UPS systems and battery packs recharge their batteries from the main supply.

    Which is the best EPS battery?

    The most common battery types used for EPS are Nickel-Cadmium, Lead-Acid, and Lithium-Ion. Lithium-ion batteries are currently the most popular EPS batteries because of the better performance and ultra-long life cycle.


    • Relatively inexpensive and widely used for many applications.
    • Known for reliability and safety.
    • Lead-Acid batteries are recyclable.
    • Much heavier than other battery types and has a lower energy density than Lithium-Ion.
    • Need regular maintenance(maintenance of lead acid battery)

    Which is the best EPS battery


    • Better performance and more stable
    • High energy density in a compact and lightweight form factor.
    • Long life cycle and does not degrade fast.
    • Requires zero maintenance and low self-discharge rate.
    • More expensive than other battery types but has the highest efficiency in energy usage.


    • Can maintain efficiency and performance in extreme temperatures.
    • Less expensive than Lithium-Ion batteries
    • Has memory effect, can lose maximum capacity if repeatedly charged after being only partially discharged.
    • Contains chromium, harmful to the environment

    What is the difference between emergency power and standby power?

    Emergency Power
    These systems are designed to provide instant power in critical applications where a sudden loss of electricity could lead to safety hazards and operation disruptions. Emergency power is typically designed to run for a short period or until the load can be transferred to longer-term backup systems.


    • Life support systems
    • Emergency lighting
    • Sprinkler systems
    • Control centers
    • Communication systems

    Standby Power
    Standby power systems are used to provide backup power for non essential systems and operations during grid blackouts and power outages. These systems are made to run for longer periods or even the entire duration of the power outage to ensure continuous operation.


    • Offices
    • Data Centers
    • HVAC
    • Computers
    • Industrial facilities
    • Residential

    What is the difference between emergency power and standby power

    What is the difference between UPS and emergency power?

    • Different safety specifications
      UPS is mainly used to protect user equipment or business from economic losses, the development of EPS power supply from power grid sudden failure, in order to ensure power safety and fire linkage needs, can immediately provide escape lighting and fire emergency, to protect the user’s life or body from harm.
    • Different performance priorities
      Both UPS and EPS power supplies can provide two-way output power. In order to ensure high quality power supply, inverter is preferred for online UPS; EPS power supply is to ensure safety, consider energy saving in daily use, and give priority to municipal power.
    • Different ways of using
      Because the UPS power supply is used online, the fault can be reported in time. And the mains power is the backup guarantee, the user can grasp the fault in time and eliminate the fault, and will not cause greater losses to the accident. EPS power supply is used offline and is the last power supply guarantee, so its reliability design requirements are high.
    • Different power supply objects
      The UPS power supply is for computers and network equipment, and the EPS power supply is for power protection and fire safety.

    How do I choose the right EPS battery system?

    When choosing an EPS battery system, you should always ensure that the system will meet your requirements.

    Here’s what you need to do:

    • Analyze Power Requirements – identify the critical systems and equipment that needs backup power, calculate their power consumption, consider the peak load, and how long backup power is needed.
    • Choose the Right Battery Technology – Lithium-Ion is usually the most common battery for EPS systems due to their great energy density, reliability, and compact size.
    • Environment Factor – pick a battery that can operate effectively in the temperature range of the site location, evaluate the space available for the battery system, and consider any weight limitations.
    • Cost – compare the upfront cost of different battery technologies and maintenance requirements. Lithium-Ion batteries may have a higher upfront cost but require zero maintenance and has ultra-long life cycles and a higher lithium energy density. On the other hand, Lead-Acid is cheaper but heavier than other battery types and has a lower energy density and shorter battery life. Therefore, lithium-ion batteries are actually cheaper and cost-effective in the long run.
    • Compliance – ensure that the battery system you’ll select comply with relevant standards and regulations in your area.

    How Do I Choose the Right EPS Battery System

    Comprehensive using guide on emergency power supply battery system

    How do you get power in an emergency?

    During emergencies, power is supplied by emergency power supply systems. These systems are usually powered battery backup systems. Battery backup systems can be a larger battery storage system. It can provide instant power to keep crucial systems running.

    How long does emergency power supply last?

    An emergency power supply may last a few minutes, to several hours, or even days. However, the exact duration depends on many factors such as load demand, emergency power supply capacity, and fuel availability for generators.

    Typically, a EPS may provide backup power for a few minutes to an hour. For large capacity battery systems, they can last for a few hours.

    What maintenance and testing is required for EPS battery system?

    To ensure safe and efficient operation, an EPS battery system must be tested and maintained regularly.

    Regular Maintenance:

    • Visual Inspection of batteries and other components for possible damage and visible corrosion.
    • Monitor the battery health by checking voltage, temperature, and other key metrics.
    • Checking the connections and terminals to ensure everything is connected properly.

    Testing Procedures:

    • Putting the EPS battery system under load to check if it can still handle the power demand during an outage.
    • Check the battery capacity to ensure that they can last the entire duration of an outage or their designed usage.
    • Verify if the ATS (Automatic Transfer Switch) seamlessly transfers power from the main supply to the backup power system.
    • Conduct emergency power drills to ensure all systems and personnels are prepared for an actual power outage.

    Safety concerns for emergency power supply battery

    • Thermal Runaway: Lithium-Ion batteries have a temperature limit of -20 to 60°C. When it overheats, it can cause fires and explosions, but can be prevented by storing batteries properly and providing adequate ventilation and cooling.
    • Leakage: Lead-Acid and NiCd batteries can leak hazardous materials that can pose environmental and health risks. Conducting regular inspections to ensure batteries are in top condition and wearing protective equipment during maintenance can reduce these risks.
    • Electrical Hazards: electric shock during maintenance and handling can be prevented through the use of proper protective gears.
    • In general, ensuring all personnel are properly trained in handling and maintaining battery systems can reduce the risks mentioned above.

    FAQS about emergency power supply

    The standard for emergency power supply systems is handled by different regulatory bodies, depending on the region or location. In the United States, the NFPA (National Fire Protection Association) sets the standard for emergency power supply systems.

    This refers to the control measures taken by the power system to ensure stable operation during large power outages or faults, often through load shedding or generator tripping.

    Backup power systems usually provide emergency power to a load. These are designed to activate automatically when the primary power source fails. Most emergency power supply systems use generators and battery packs to provide power during outages.

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