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  • Introduction
  • NiFe-S Battery List
  • Photovoltaic System
  • NiFe-S Battery Benefits
  • Compare VRLA and NiFe-S

About Nickel-Iron Solar Batteries

Nowadays great importance is attached in more and more countries to environmental protection and advocating adopting green energies. Q-Lite Nickel-Iron (Ni-Fe) batteries, with its high reliability, long service life, lower cost, pollution free and other strong features, are gradually replacing lead-acid batteries for many a wide range of applications, especially for solar PV and renewable energy and power systems.


Q-Lite NiFe-S Solar batteries are specially designed and manufactured for solar PV and renewable energy  applications under critical and rough circumstances, which refer to low operation cost, low self-discharge, , long cycle life, environmental friendliness, etc; also the batteries are capable of withstanding deep discharge, wide temperature variation, mechanical & electrical abuses and still generate excellent and reliable performance over a long period of time.


NiFe-S solar batteries are suitable for all solar photovoltaic power systems. They are widely used as storage power supply for solar photovoltaic system, offshore oil platforms, railway transportation, traffic lighting and , signaling, faraway BTS station, cathodic protection for pipelines and radio navigation system. The service   life of NiFe-S solar batteries is expected to be longer than 20 years with correct handling instructions and recommendations by manufacturer.


Battery unique features include a steel frame with welded plates, shock-resistant polypropylene or MBS casing material and excellent flame arresting flip-top vent. In addition, there is a big reserve of flooded electrolyte, which prolongs the topping-up interval period. With strong design and advanced manufacturing methods, NiFe-S solar batteries are particularly suitable for remote and isolated locations and require minimal maintenance.






About Photovoltaic Systems

The power generated by solar photovoltaic systems is widely used for various applications, such as pumping water, indoor lighting, power supply for a microwave tower on top of mountains, etc. A general solar photovoltaic system is ideal for site and unmanned operation due to easy installation and high reliabilities.




Photovoltaic Applications


Navigations Aids Telecommunication Systems

* Remote lighthouses                   

* Beacons   

* Offshore           

* Base Stations
* Radio Repeater Stations

* Emergency Telephone Posts

Railway and Light Trains Oil and Gas Fields
* Crossing Gates
* Lighting and Signaling

* Emergency Lighting on offshore platforms

* Cathodic Protection for Pipelines

* Electric Power Supply for Remote Areas / islands  





About Benefits of NiFe-Solar Batteries

* Long cycle life (maximum service life target 20 years plus with correct operations)
* Wide operating temperature range
* Low maintenance
* High resistance to mechanical and electrical abuse
* Low transportation and installation cost





Characteristics Comparison Table


Lead Acid Cell

NiFe-S Cell

Nominal Voltage



Float Charge Voltage

2.23/cell ~2.3V/cell


Temperature makeup  in float charge

-3mV /℃•cell

-3mV /℃•cell

Operating Voltage



Standard charge and discharge current



High rate discharge performance



Overcharge performance



Over discharge performance

Extremely poor


Effect form from floating charge voltage

When the charge voltage exceeds 2.35V /cell, the service life of VRLA cell will be reduced by 1/2 for every 0.1V/cell increase.

Not affected

Operation Life

3-5-8 years

20 years

Storage Life

2 years

4 years

High temperature performance

When the ambient temperature exceeds to 50℃, there is capacity decrease risen from   reduction of t charge acceptance performance, which significantly impact the service life of VRLA cells.

Not affected

Low temperature performance

Huge effect on the service life of VRLA cell

Little effect on the service life of NF-S series Ni-Fe cell

Thermal danger if shorted



Premature Capacity loss



Environmentally friendly






Cost Comparison Table on VRLA and NiFe-S Cells





Cost Effectiveness

There are three cost calculation concerns regarding the cost of a battery system:
* Initial investment, i.e. cost of purchases, spares, tools and installation.
* Maintenance cost, i.e. unexpected and expensive downtime cost.
* Replacement cost, i.e. dismantling, shipping, disposal and administrative cost.

VRLA Battery

In case of lead acid batter application, this can also include frequent requirement and all costs associated with an unexpected battery failure.


Ni-Fe Batteries

NiFe cells may cost more than lead-acid ones for the stage of initial investment alone. As for stand-by, like solar photovoltaic applications with large capital investment installed in remote locations, maintenance reliability and replacement cost factors can greatly outweigh the initial cost of the battery.


The performance of Ni-Fe cells are similar to that of Ni-Cd cells. In addition, Ni-Fe cells are pollution-free. Future maintenance requirement and life cycle costs are the main factors to be considered when making a cost effectiveness calculation. Considering the extra costs of sudden or premature failure of Lead acid batteries, Ni-Cd and Ni-Fe batteries are cheaper in the long-term.



Prismatic NiFe-S Battery Specifications (Pocket Technology)

Model No. Nominal
Rated C5 Max.
Dimensions (mm) Terminal
V AH kg Height Width Thickness L
NF10-S 1.2 10 0.8 138 84 38 M6 0.2 MBS or PP
NF20-S 1.2 20 1.2 220 113 32 M6 0.3 MBS or PP
NF30-S 1.2 30 2.8 245 134 68 M10 X 1 0.8 MBS or PP
NF40-S 1.2 40 3.0 245 134 68 M10 X 1 0.8 MBS or PP
NF50-S 1.2 50 3.0 245 134 68 M10 X 1 0.7 MBS or PP
NF60-S 1.2 60 4.2 285 134 70 M16 0.9 MBS or PP
NF70-S 1.2 70 5.6 365 141 80 M10 X 1 1.8 MBS or PP
NF80-S 1.2 80 5.8 365 141 80 M10 X 1 1.7 MBS or PP
NF100-S 1.2 100 6.2 365 141 80 M10 X 1 1.6 MBS or PP
NF120-S 1.2 120 6.4 365 141 80 M10 X 1 1.4 MBS or PP
NF150-S 1.2 150 9.0 345 164 106 M20 2.5 MBS or PP
NF200-S 1.2 200 10.0 345 164 106 M20 1.8 MBS or PP
NF250-S 1.2 250 18.5 425 276 138 M16 X 2 4.6 PP
NF300-S 1.2 300 21.5 450 276 138 M16 X 2 4.2 MBS or PP
NF350-S 1.2 350 22.5 450 276 138 M16 X 2 4.0 MBS or PP
NF400-S 1.2 400 23.5 490 276 138 M16 X 2 4.3 PP
NF500-S 1.2 500 26.0 490 276 138 M16 X 2 4.7 PP
NF600-S 1.2 600 38.0 510 291 176 M20 X 2 8.7 MBS or PP
NF700-S 1.2 700 39.0 510 291 176 M20 X 2 8.4 MBS or PP
NF800-S 1.2 800 60.0 570 398 186 M20 X 3 17.2 MBS or PP
NF900-S 1.2 900 61.0 570 398 186 M20 X 3 15.6 MBS or PP
NF1000-S 1.2 1000 62.0 570 398 186 M20 X 3 15.0 MBS or PP
  • Battery manufactured in compliance with IEC 60623 standard.
  • Container Material:
    PP = High impact polypropylene Co-polymer, MBS = Methacrylate butadiene styrene.
  • All listed items refer to Q-Lite standard supply. More items with custom specs are to be available upon