CYGNUS 3 >Connect to diesel gensets <100 kVA

Product Overview

The ‘All New’ Cygnus® 3. The most popular silent hybrid power system, reinvented.

Featuring a host of additional upgrades to enable seamless process automation, Cygnus® 3 uniquely features SWITCH technology between Three Phase Support and L1 Support Only modes. Cygnus® 3 is the most versatile, dependable hybrid system of its kind on the market.

With up to 65 kWh of energy storage, Cygnus® 3 is available with LFP or AGM storage technologies. Ideally suited for use with diesel generators of up to 100 kVA, Cygnus® 3 manages load spikes of up to 16.8 kVA without triggering auto start of the diesel generator.

Used by many of Europe’s leading plant hire companies, Cygnus® 3 sets the standard in hybrid power for temporary applications, providing completely silent power and can save up to 720 tonnes of CO2 emissions over its lifetime.

Cygnus® 3 is a cost effective and eco-friendly addition to any fleet, delivering fast returns for hire operators and significant savings in both fuel and on-site emissions for end users.

As with all Firefly hybrid power systems, Cygnus® 3 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 3 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 3, up to 720 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 3 can be specified at point of purchase with Firefly’s Solar-Pack™, which allows Cygnus 3 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 3 applications are not limited to, but include silent power for:

  • Site Compounds
  • Perimeter Lighting
  • Drying Rooms
  • Welfare Facilities
  • Utilities
  • Infrastructure
  • Telecoms

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 3 Phase
  • 125 A CEE Form 3 Phase
  • 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 2.5mm Zintec Steel Modular Canopy



Cygnus® 3 is available in three configuration options:

  • LFP (Lithium Iron Phosphate)
    Storage with 50 kWh and 24 kVA power output.
  • LFP (Lithium Iron Phosphate)
    Storage with 65 kWh and 24 kVA power output.
  • AGM (Absorbent Glass Mat)
    Storage with 50 kWh and 24 kVA power output.

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

Technical Downloads

Hire / Purchase

Cygnus 3 can be hired from our extensive partner network across Europe. Click here to find a hire partner. Hire today – click here

Alternatively Cygnus 3 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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