Storage Technology

Energy storage is at the heart of all of our hybrid power systems and Firefly offers a range of options, carefully researched to perform across a wide range of applications. Every Firefly hybrid model is equipped with a smart energy storage management system to ensure safe, optimal performance and longevity.  OPzV and AGM based systems are fitted with Firefly’s CARE BMS technology whilst LFP based systems are underpinned by our ACTIVE BMS technology.

Our storage technologies are stringently tested and backed by our extensive warranty ensuring market leading reliability. Read more about these options to choose which suits your applications.

LFP (Lithium Iron Phosphate)

Energy Storage Technology | Lithium Iron Phosphate (LFP) offers significantly extended life expectancy compared to other technologies; and is used in a wide variety of appliances from electric cars to mobile phones. LFP based hybrid power systems offer the greatest storage capacity option and is lightweight, long lasting and reliable. The chemistry of LFP storage allows for a very fast recharge, reducing diesel generator runtime further. Firefly’s LFP storage provides consistent discharge characteristics whatever the load requirements, which means that total energy per cycle is unaffected even at high discharge rates. In addition, LFP has an extended operating temperature range compared to other storage technologies offering no reduction in cycle life when operated at higher temperatures.

The total cost of ownership of a LFP based hybrid power system is similar to AGM or OPzV technology, but with the benefit of no storage replacement expected during the lifetime of the hybrid power system. However LFP offers significant weight reduction, which improves transport and handling efficiency and the overall environmental benefit of the hybrid system.

Choose LFP technology if you anticipate higher base loads, want to maximise logistics efficiency or want a storage technology that will last the lifetime of the hybrid power system. LFP is the most versatile storage technology for a broad range of demanding applications.

All Firefly LFP based systems are supported by our ACTIVE BMS management system.



cycle life vs capacity LFP

Life Expectancy:

  • 2000 cycles to 80% of original capacity
  • 4000 cycles to 60% of original capacity

Available in Cygnus® 1,2,3,4


OPzV (Sealed Tubular Plate)

OPzV storage technology combines gel electrolyte and tubular plates to deliver excellent cycle life performance and is ideal for demanding applications requiring a high number of discharge /recharges. OPzV uses a sealed enclosure which means that it can be used in poorly ventilated areas. Like AGM, OPzV is a robust and stable energy storage technology. Higher internal resistance means that OPzV is better suited to longer, low rates of discharge. This technology is used in the Cygnus® 4 model to give a larger storage capacity of 90 kWh.

The Cygnus® 4 OPzV model is supported by our CARE BMS management system, find out more about CARE BMS here.



Life Expectancy:    cycle life vs capacity OPzV

  • 1500 cycles to 80% of original capacity
  • 2000 cycles to 60% of original capacity

Available in Cygnus® 4

AGM (Absorbent Glass Mat)

AGM is a cost effective storage technology which is sealed and requires little maintenance.  The electrolyte is absorbed into a fibre glass mat material held firmly between the plates. This makes the internal resistance relatively low, making this storage technology suitable for deep cycle applications, typical of hybrid power systems.  AGM technology has proven very reliable and robust, and can stand low temperature environments.

All Firefly AGM based systems are supported by our CARE BMS management system, find out more about CARE BMS here.



Life Expectancy 

  • 600 cycles to 80% of original capacity
  • 800 cycles to 60% of original capacity

Available in Cygnus® 1, 2,3; Arcturus 1, 2; Vega 2, 3

Energy Storage Technology Comparison

The choice of LFP, OPzV or AGM based hybrid power system is determined by the usage profile. Whether this is for low loads, with long runtime, or for high power discharging many times a day, we can offer a suitable storage option.

You should consider the following factors:

  • Discharge rate
  • Runtime
  • Cycle time (charge to discharge)

Our account managers and technical team are happy to discuss your requirements in more detail, contact us now.

Comparison Graphs

Cycle life vs capacity

Temperature vs lifecycle









Summary of Key Benefits of using LFP over Standard AGM/OPzV Storage Technology:

  • Increased cyclic life of up to 4000 cycles
  • Very fast recharge to 100% at full recharge rate
  • The storage technology will deliver its full stored capacity, regardless of the size of load
  • LFP based hybrid power systems offer the greatest storage capacity option
  • Higher energy density and a more efficient energy store than AGM or OPzV

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