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: +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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