A standby generator is a special type of power generator that is used whenever the regular power supply fails. Its purpose is clearly defined: it provides electrical energy within a short time so that important consumers can continue to operate. In contrast to a mobile construction site generator, a standby generator prioritizes supply reliability over flexibility.
Typical applications include residential buildings, agricultural businesses, commercial enterprises, public institutions, or critical infrastructures. If the public grid fails, a standby generator can start manually or automatically and take over selected circuits – for example, heating, ventilation, milking technology, refrigeration units, servers, or lighting. This prevents business interruptions, data loss, or even property damage.
Technically, a standby generator usually consists of an internal combustion engine (mostly diesel), a generator, a control system, and optionally an automatic transfer switch. This so-called ATS switch monitors the public grid and ensures that the generator starts automatically and takes over the power supply in the event of a power outage. As soon as the grid power is stably available again, the system automatically switches back and shuts down the generator in a controlled manner.
Depending on the application, standby generators are available as portable solutions for individual consumers or as permanently installed systems with high power. While simple systems only ensure a basic supply, larger standby generators are designed to supply entire buildings or businesses for hours or days. Correct sizing is important: power, running time, fuel supply, and the type of consumers play a crucial role.
A standby generator is therefore not a luxury, but a targeted safeguard against power outages – especially where a standstill can be expensive or dangerous.