Power Generators, Emergency Power Generators, and Standby Power Systems: Terms Simply Explained
Anyone dealing with mobile or stationary power supply quickly encounters terms like power generator, power set, emergency power generator, standby power system (SPS) or safety power supply system. In everyday language, these terms are often used synonymously. However, technically and normatively there are clear differences.
Key Takeaways
Power generators and power sets are umbrella terms for devices used for electricity generation. An emergency power generator is intended for use in the event of a power outage. A standby power system, on the other hand, is a normatively and technically defined complete system comprising a generator, control, transfer switch, and protection and monitoring devices.
Simple Explanation
Power Generator, Electricity Generator, Generator, and Power Set
These terms are usually used interchangeably in common parlance. They generally refer to a device that generates electrical energy independently of the public power grid. Technically, it consists of:
- an engine, for example, gasoline, diesel, or gas
- a generator, which is the actual electrical machine
Typical applications include:
- construction sites
- agriculture
- forestry
- events
- private applications
Whether one speaks of a power generator, electricity generator, generator, or power set makes little difference in everyday life. It almost always refers to a mobile or stationary unit for electricity generation.
Emergency Power Generator and Emergency Generator
An emergency power generator, also called an emergency generator, is a power generator that is specifically intended for use during a power outage. The difference from a normal power generator lies less in the device itself, but primarily in the application concept:
- Power supply when the grid fails
- often permanently installed or prepared
- supply of defined loads, e.g., heating, cooling, or light
A gasoline emergency power generator is often used in private or mobile settings, for example, for single-family homes or smaller businesses. A diesel emergency power generator, on the other hand, is typical for higher power outputs, longer operating times, and professional applications.
Fire Department Generator
A fire department generator is not a separate technical type, but a specially equipped power set intended for use by fire departments, THW (German Federal Agency for Technical Relief), or disaster control. Typical characteristics include:
- robust construction
- simple operation
- high reliability
- often gasoline or diesel powered
- often integrated on a carrying frame or in a vehicle
Technically, this is also a power generator, but it is designed for special operating conditions.
Technical Classification for Professional Users
Power Generator and Power Set as Umbrella Terms
Technically, the power generator is the umbrella term for all devices that generate electrical energy. These include:
- gasoline power sets
- diesel power sets
- gas generators
- inverter power generators
A diesel power set is preferably used when:
- long operating times are required
- high power outputs are needed
- continuous operation or high reliability is the focus
A gas generator uses natural gas or liquefied petroleum gas and is often used where gas is available or emissions need to be reduced.
Inverter as a Special Design of the Power Generator
An inverter power generator is a special design. Here, the generated electrical energy is electronically processed so that:
- a very clean sine wave
- a stable frequency
- quiet operation at partial load
is produced. Inverters are particularly suitable for:
- sensitive electronics
- IT
- control systems
- mobile applications with varying loads
An inverter is therefore not a separate application purpose, but a technical implementation of a power generator.
Emergency Power Generator vs. Standby Power System (SPS)
Here lies one of the most important differences. An emergency power generator can be part of a standby power system, but it is not automatically synonymous with such a system.
Emergency Power Generator
An emergency power generator supplies consumers in the event of a power outage, usually manually started, manually switched on, and without automatic transfer.
Standby Power System
A standby power system (SPS) is the technically and normatively defined form of emergency power supply. It completely or partially replaces the public grid.
Requirements for an Emergency Power Generator
Typical requirements for an emergency power generator are:
- safe isolation from the public grid
- supply of selected circuits
- no backfeed into the grid
Additional Requirements for a Standby Power System
An SPS meets additional requirements and is integrated into the electrical system as a complete system. These include:
- automatic start in case of power failure
- automatic transfer between grid and SPS
- monitoring of voltage and frequency
- defined transfer times
- clear integration into the electrical system
An SPS is therefore more than just a generator. It is a complete system consisting of a generator, control, transfer switch, and protection and monitoring devices.
Backup Power Generator and Safety Power Supply System
Backup Power Generator
The term backup power generator is often used synonymously with standby power system. Technically correct, it describes a generator that:
- supplies power when the grid is completely replaced
- is integrated into a defined backup power concept
In common parlance, emergency power generator, backup power generator, and emergency generator overlap, even if the technical requirements can differ.
Safety Power Supply System
The safety power supply system is the highest level. It is subject to special requirements and standards, for example for:
- hospitals
- assembly venues
- tunnels
- safety-relevant buildings
Typical characteristics are:
- very short transfer times
- redundancy
- regular inspections
- high availability
Not every emergency power generator is automatically a safety power supply system. Clear regulations apply here, including those from VDE, VDI, VDN, and BSI.
Summary of Terms
| Term | Meaning |
|---|---|
| Power Generator / Electricity Generator / Generator / Power Set | Umbrella terms for devices used for electricity generation |
| Emergency Power Generator / Emergency Generator | Power generator for use in the event of a power outage |
| Diesel Emergency Power Generator / Diesel Power Set | Powerful, durable, and suitable for professional applications |
| Gasoline Emergency Power Generator | Mobile, flexible, and suitable for smaller power outputs |
| Gas Generator | Uses natural gas or liquefied petroleum gas and can be operated with lower emissions |
| Inverter | Design with electronic voltage conditioning |
| Fire Department Generator | Specially designed generator for emergency services |
| Backup Power Generator | Generator for grid replacement in a backup power concept |
| Standby Power System (SPS) | Automatic, standard-compliant backup power system |
| Safety Power Supply System | Critical, standard-bound supply with high requirements |
Typical Application Scenarios
Private and Mobile
For gardens, leisure, smaller loads, or flexible uses, a gasoline generator or an inverter power generator is often sufficient.
Commercial and Industrial
For higher power outputs, longer operating times, or clearly defined backup power circuits, diesel generators or prepared emergency power solutions are often used.
Critical Infrastructure
Hospitals, assembly venues, tunnels, or safety-relevant buildings require normatively planned standby power systems or safety power supply systems.
Frequently Asked Questions
Is a power generator the same as a power set?
In everyday life, yes. Both terms are often used synonymously. Technically, a power generator generally describes a device for generating electrical energy.
When is it called an emergency power generator?
It is called an emergency power generator when the power generator is specifically intended to supply power during a power outage and is supposed to supply defined loads.
What distinguishes an SPS from a simple generator?
A standby power system is a complete system. In addition to the generator, it includes control, transfer switch, protection technology, monitoring, and clear integration into the electrical system.
Conclusion
Many terms related to power generators are used synonymously in everyday life. However, technically and legally there are clear differences, especially between a simple power set, an emergency power generator, and a standby power system (SPS).
The decisive factors are always:
- application purpose
- power demand
- degree of automation
- legal and normative requirements
Knowing these differences helps avoid wrong decisions in selection, installation, and operation. We at SEV would be happy to advise you on which generator, power set, or standby power solution suits your application – practical, standard-compliant, and tailored to your requirements.