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Nickel Iron (NiFe) Batteries

We recommend NiFe batteries as a Go-to-Battery for longevity, the only drawback is these Battery have a lot larger footprint and are Very Heavy & Not suitable for wall mounting due to there Weight.

Distilled Water is required to periodically Top-up the battery cells, we recommend customers purchase a $80 Distilling Kettle that operates off your Solar to produce FREE Distilled Water.

An Automatic Gravity feed Battery Watering system will provide a maintenance free operating system, this can be made from Fish Tank Air lines and T-fittings.  NB: The Cells will automatically Fill to the level you insert the feed line into the cell.  If the Electrolyte falls below the Nickel Iron plates, then your Cells can Overheat & Short !

IMPORTANT: An Automatic Fill Distilled Water Tank can be ANY size, and must ONLY draw Distilled Water from the bottom of the Tank, the Tank must NOT let air into the Air pocket from the top of the Tank, or the Distilled Water will simply drain out and over fill the battery cells !  This system works on the principle that Air is Only drawn into the Distilled Water Tank when the Electrolyte in any Cell Drops below the inserted tube(s), as only then will Air enter the watering tube & bubble back into the Reserve Tank, and then Distilled Water will flow into the Cell(s) to the level the Tube is inserted.  

NB: The Fill Tubes should be reasonably tightly fitted & pushed through the filler Cap or Battery Casing so not to move, there should be a Tiny Breathing Hole in the Top of each Cell, this is to let Air in & Out of each Cell so the System Works correctly !

The Pros & Cons:

  1. Our NiFe batteries come with an 8 year Warranty, but have a Proven 30+ year Life Span !
  2. NiFe batteries require a larger storage footprint & are heavier at approx. 45kg per kWh, compared to LiFePo4 batteries at approx. 8kg per kWh.
  3. In 2023 the NiFe batteries Cost per kWh is approx. $650kWh. (against the rest)
  4. NiFe batteries provide a Very Long Operational Life, with decades of proven long term Reliability.
  5. Many NiFe batteries are still in fully operational condition after 50+ years of service, and most will likely for another 50 years, if you keep on replacing or filtering the Electrolyte, as that provides a "Like New Battery" again !
  6. Be aware some Chinese manufacturers Re-furbish X-Government Cells & sell them as New !

This Electrolyte Chemical Mixing Calculator provides the correct mixing quantities !

If you are looking to Replace the Electrolyte, we can Import the Chemicals, however that may be more expensive than sourcing locally, the Chemicals for a 500Ah cell cost approx. $45 per Cell if imported.

EG: 40x 500Ah Cells requires 75kg of KOH and 5.6kg of LiOH chemicals.

25kg Bag of KOH from Bosca below Costs $95, and 500g LiOH on ebay costs $150, use links below to Purchase;

What comes with a Bank of Nickel Iron Batteries.

Accessories that come with

NiFe Battery Bank, Battery Cables are also included.

40x 1200Ah Batteries come in 5x strong plywood Crates.

=57.6kWh Energy Storage.

NiFe 1200Ah Battery is the largest NiFe capacity.

Battery Racking is Optional.

1'200Ah Racking Front.

1'200Ah Painted Steel Racking Cost *$900.

400Ah Batterys.

10x 500Ah, 1.2V Batteries.

This is a 6kWh Bank.

Six rows 40 NiFe Batteries, can be 12/24/48V or up to a maximum 750V DC.

600Ah / 300Ah Batteries.

300Ah Battery.

800Ah Battery.

Steel Battery Racking.

Round Pipe Battery Racking.

24v Multiple Battery Configuration.

Accessories List.

Accessories included with small Ah Battery purchase.

Strong Double Plywood Battery Crates.

HISTORY of Nickel Iron Batteries

In 1901 Thomas Edison developed this battery technology, it has long been considered one of the perfect battery technologies, and time has proven them against all comers!  You can still purchase some of these Vintage 100yrs old battery, and they still work, this has a lot to do with the fact that the energy is actually stored in the Electrolyte.

Edison once said, “A good idea is never lost, even though its inventor or possessor may die without publicising it, it will someday be reborn in the mind of another.”  See these Heritage images (1)(2)(3)(4)(5)(6)(7)(8).

The latest designs of these days are rated and reported to cycle over 10'000 times, that's 30+ year daily cycles life span, where the electrolyte only need to be replaced after 7~10+ years, covered below in more detail.  We sell these battery's for approx. $700kW, that half the cost of a TESLA battery, and NiFe batteries will outlast TESLA battery technology, over three fold !

Worldwide Users Report: NiFe battery's & Electrolyte have cycled over 10'000 times;

  1. That equates to over 27years, with Electrolyte lasting between 7~12+ year periods, meaning you only have to Replace or Filter the Electrolyte, the electrolyte replacement cost is approx. 5~7% of the battery cost, that will provide like new condition for the next 10+ years.
  2. Battery's Liquid level need to be kept above the internal plates, checked every 6~12 months if you have a large reserve tank on a Automatic Watering system.

Nickel Iron (NiFe) Battery Electrolyte consists of;

What is the Correct NiFe Electrolyte Chemical Mixing Quantities ?

This Calculator automatically provides the correct chemical mixing quantities.

These batteries are now manufactured with stronger and newer improved technology.  A NiFe battery bank is made up from individual cells, all cells are 1.2 volts, No matter the size of the cell or battery bank.  To make a battery Bank to a specific Voltage, you simply add cells together until you get the require voltage.

Example in Green are the Cells we recommend you Purchase;

  • 10 x 1.2volt cells = 12 Volts System.
  • 12 x 1.2volt cells = 14.4 Volts.
  • 13 x 1.2volt cells = 15.6 Volts.
  • 14 x 1.2volt cells = 16.8 Volts.
  • 20 x 1.2volt cells = 24 Volts.
  • 22 x 1.2volt cells = 26.4 Volts.
  • 23 x 1.2volt cells = 27.6 Volts.
  • 24 x 1.2volt cells = 28.8 Volts.
  • 40 x 1.2volt cells = 48 Volts.
  • 42 x 1.2volt cells = 50.4 Volts
  • 43 x 1.2volt cells = 51.6 Volts
  • 44 x 1.2volt cells = 52.8 Volts

It is worth Noting that by simply adding Two~Four additional NiFe Cells into the Battery Bank, it will provide a better Hi-Voltage performance characteristics on Hi-Amp draws, most modern Inverters are capable of handling up to 60 Volts DC, the additional Batteries also takes the strain off the Bank. NiFe battery Banks can be configured up to 750V DC,

The advantage of making a battery up from individual cells is that if one cell fails, you simply replace that cell. You can add to your battery bank at any time if you need to store more energy.  Because NiFe batteries have such a long life, we inform our clients that if they are relocating, it is relatively simple to dismantle the battery system and take them to your next location, be it a place that is owned, leased or rented.  In fact that also applies to the pole mounted dual-axis solar tracking, besides transportability, dual-axis tracking also Generates up to 50% more power than a fixed flat panel systems.

The key to Nickel Iron (NiFe) Batteries long life lies in quality manufacturing, the VARTA cell technology was designed for use moving & vibrating situations like vehicles, trains & mining equipment etc., providing a very long working life.

NiFe batteries will continue to work like new a long past the 10 year manufacturer guarantee period, and have long been considered the best green energy battery for decades, they are 100% recyclable, with no dangerous materials including the electrolyte, NiFe batteries are a Non Acid battery.

As NiFe battery prices have dropped, they are now widely used as DC back-up power supply for photo voltaic storage and used in homes, businesses, vehicles, remote telecommunications, railway, mines, tractors, petrochemical, oil and gas, electricity industries, and other renewable power applications.

Nowadays, more and more countries have attached great importance on environmental protection and advocate using green energy. Because of NiFe batteries high reliability, long service life, lower maintenance cost, pollution-free and other positive characteristics, NiFe batteries are rapidly replacing lead-acid batteries in wide ranges of applications, especially in off-grid systems using Solar, Wind, Aqua as well as power produced by Fuel Generators, NiFe are also be used in load shifting applications, e.g. charging the batteries using cheaper off-peak power, usually at night.

We can order NiFe batteries Casings made from either Polypropylene (PP) or Methacrylate butadiene styrene (MBS), MBS is also known as impact modified Styrene Methyl Methacrylate (SMMA). This polymer has excellent clarity, high stiffness, high impact performance and easy process ability.

Advantage of NiFe Batteries:

  1. The Cheapest Long Term Battery Investment Cost per kWh.
  2. Wide capacity range: 100Ah~1200Ah.
  3. SGS, GOST, IEC60623, ISO, CE, UL certificate.
  4. Long life: 15~40+ years.
  5. -20°C~50°C Operating Temperatures.


  • MBS (Methacrylate Butadiene Styrene) is an Opaque Casing modifying agents used to improve the impact strength.
  • PP (Polypropylene) is a Transparent battery Casing, material is Hard, but Fragile in low temperatures.
  • Excellent charging efficiency and smooth discharge voltage.
  • High reliability without sudden death.
  • Ability to withstand ultra-high and ultra-low environmental temperatures.
  • Withstand physical and mechanical abuses.
  • Exceptionally long & reliable service life (up to and over 50yrs).
  • Pollution-free, total green energy and recyclable.
  • Low Self-discharging, not an issue when being charged on a daily basis.
  • No emission of corrosive gases, Safe from flame & explosion.
  • Pollution-free and excellent mechanical strength.
  • Convenient for installation and low maintenance.
  • Comply with SGS and GOST standard.
  • Availability to design and manufacture other model according to user's requirements.
  • Electrolyte weighs approx. 1.2kg per litre.

Initial Charge:

  • New battery stored for more than 6 months should be charge at 0.2C 5A for 12hours, then discharge at 0.2C 5A to 1v per Cell.
  • Repeating above charge and discharge for 3-5 cycles.
  • If the discharge duration isn't less than 5hours and the battery voltage isn't less than 1v per Cell, the battery can be put into operation according to normal charge.
  • C5 means the output capacity of the battery discharged to cut-off voltage at 1.0V with 5 hours rate at 20°C. Namely-nominal capacity, Under normal circumstances, the battery should be charged by normal rate (0.2C 5A).
  • In the case of emergency, the fast charge method ( 0.5C 5A ) can be used.
  • The battery must be charged at normal rate (0.2C 5A) for 12 hours when it is overcharged.



















 Sheets (.pdf) 







100  141 80 370 4.5 6.2 1.7 PP/MBS M10X1  
200  164 106 345 8 11 3.0 PP/MBS 2xM16 Download
300  276 138 450 14.5 20.5 6.0 PP/MBS 2xM16 Download
400  276 138 450 17 23 6.0 PP/MBS 2xM16 Download
500  276 138 490 20 27 7.0 PP/MBS 2xM16 Download
600  291 176 510 27 37.5 10.0 PP/MBS 2xM20 Download
700  291 176 510 29 39 10.5 PP/MBS 2xM20 Download
800  398 186 570 39 59 20.0 PP/MBS 3xM20  
900  398 186 570 41 60 19.0 PP/MBS 3xM20 Download
1'000  398 186 570 44 61 17.0 PP/MBS 3xM20 Download
1'100  398 186 570 46 63 17.0 PP/MBS 3xM20  
1'200  398 186 570 49 66 17.0 PP/MBS 3xM20 Download

NiFe Benefits include:


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