CYGNUS® 2 >Connect to diesel gensets <45 kVA

Product Overview

Cygnus® 2 is a powerful single phase hybrid power system from Firefly’s rental specification range.

Ideally suited for use with diesel generators of up to 45 kVA, Cygnus® 2 manages load spikes of up to 5.6 kVA without triggering auto start of the diesel generator.

Cygnus® 2 incorporates all the features that you expect of a premium product from Firefly and is available with up to 37 kWH energy storage with LFP technology or 25 kWH with AGM technology.

Modest in footprint, Cygnus® 2 provides versatility, reliability and completely silent power. Delivering ease of operation as a primary or back-up, straightforward noise-free power solution.

The integration of Cygnus® 2 as part of standard diesel generator power installations, delivers significant noise, CO2, NOx and PMs reductions. Over the product lifetime of Cygnus® 2, up to 375 tonnes of CO2 emissions potentially can be saved.

As with all Firefly hybrid power systems, Cygnus® 2 works seamlessly with GLOW RFM® cloud platform to allow control, diagnostics and reporting from anywhere in the world.

Applications and Benefits


Whilst connected to a diesel generator, Cygnus® 2 provides base load management, reducing the runtime of the diesel generator. As a result, noise, CO2, NOx and PM are significantly reduced. Over the product lifetime of Cygnus® 2, up to 375 tonnes of CO2 emissions potentially can be saved.

In addition, the frequency of servicing the diesel generator is reduced, whilst also providing back-up power in the event of generator breakdown.


Cygnus® 2 can be specified at point of purchase with Firefly’s Solar-Pack™, which allows Cygnus® 2 to operate in stand-alone mode using the Solar PV arrays supplied as the primary power support. Providing a truly silent 24 hour operation with zero emissions.

Optionally a diesel generator can also be connected as a back-up power source.


Cygnus® 2 applications are not limited to, but include:

  • Singal Cabin Compounds
  • Security Lighting and CCTV Systems
  • Aviation Lighting
  • Telecoms
  • General Construction
  • Restricted Access Sites

Learn more about the applications and benefits for your sector by following the links below.

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  • Variable RCD Earth Fault Protection
  • MCB Over Current Protection
  • Limit Switch – Cuts power if access door is opened
  • Emergency Stop
  • Lockable Service Doors
  • Lockable Control Panel Door


  • GLOW RFM® 
  • 63 A CEE Form and Busbar Wiring Options
  • 16 A Maintenance Charge Circuit
  • Binding Posts for Remote Generator Start/Stop


  • Digital Timer
  • Reinforced Forklift Pockets
  • Lift and Drag Skid
  • Rotating Lifting Ring
  • Compact Design


  • Built to ISO:9001 Quality Management System
  • Premium Quality Components
  • Rental Specification
  • IP55 Rated Toughened 2mm Zintec Steel Modular Canopy



Cygnus® 2 is available in three configuration options:

  • LFP (Lithium Iron Phosphate) Storage with 37 kWh and 8 kVA power output.
  • LFP (Lithium Iron Phosphate) Storage with 25 kWh and 8 kVA power output.
  • AGM (Absorbent Glass Mat) Storage with 25 kWh and 8 kVA power output.

Learn more about our storage technologies and which one is right for you here.

Technical Downloads

Hire / Purchase

Cygnus® 2 can be hired from our extensive partner network across Europe. Click here to find a hire partner. Hire today – click here

Alternatively Cygnus® 2 can be purchased directly from the manufacturer, give us a call or drop us a line using the details below:

[email protected] +44 (0)800 091 4090

All Cygnus® models are sold with a comprehensive 5-year Firefly warranty as standard, view our warranty page for further information.


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