Iron Edison

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Nickel Iron / Nickel Iron (Ni-Fe) Battery

for Renewable Energy & Backup Power Applications

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The Last Battery You Will Ever Buy!

* 11,000+ Cycle Life Expectancy

* 80% Depth Of Discharge

* 12, 24 and 48 Volt Applications

* Refillable/Replaceable Alkaline Electrolyte

* Nearly Indestructible

Iron Edison recommends Nickel Iron (Ni-Fe) battery technology for your off-grid or renewable energy storage needs. Vastly outlasting the 5-7 year life cycle of their lead-acid counterparts, Nickel Iron battery systems have an expected life of 30+ years and are quickly becoming the environmentally sensitive choice for off-grid and renewable energy storage applications.

Over a century ago, Thomas Edison found a battery design that he considered to be nearly perfect. Today, Iron Edison is proud to offer an updated version of this incredible design that is specifically manufactured for renewable energy systems.

Sizing Nickel Iron batteries

Each container holds one (1) 1.2 Volt cell.  Ten cells are used in a series connection to make a 12 Volt battery, 20 cells for a 24V battery, and 40 cells in a 48V battery.  Cell capacities range from 100 to 1,000 Amp-hours (Ah). The product of capacity and voltage determines the amount of energy (kWh) your battery can store. 

It's important to compare the available Amp-hours in our battery to the available Amp-hours in a lead acid battery.  With our Nickel Iron batteries, you can discharge up to 80% of the total capacity without any damage the cell or its future capacity. With a lead acid battery, it's recommended to only use 20-30% of the total battery capacity to get 5 years of life.  This means over-sizing the lead acid battery with several parallel strings, which can lead to uneven charging.  It also means the battery only cycled at the top quarter of it's capacity, which is the least efficient part of the battery.

Our design philosophy is to recommend a balanced system.  This includes having a battery that can be recharged in one day, with extra power to keep running your loads at the same time.  In order to figure out exactly what size battery is right for you, please give us a quick call and we will help you understand our calculations.  

In general, let's compare a Nickel Iron battery to a 24 Volt 1200Ah lead acid battery.  With a recommended depth of discharge of 30%, this lead acid battery would provide you with 360 Amp hours of available capacity.  At the very most, you would have 600 Amp hours available if you discharged to 50%.  This deeper discharge will shorten the life of a lead acid battery to less than 5 years.

To achieve a similar usable capacity of 360Ah with a Nickel Iron battery, we would recommend a 500Ah 24V Ni-Fe battery.  This would provide 400Ah at 80% depth of discharge.  With our Nickel Iron batteries, we are able to use a smaller battery that will offer the same or more usable capacity than an equivalent lead acid battery.  This deep discharge tolerance is a hallmark of Nickel Iron.

Exclusive Battery Testing

Iron Edison is the only company to have tested Nickel Iron battery at the National Renewable Energy Laboratory in Golden, CO.  The test confirmed the cells over-perform at the 5, 10 and 20 hour discharge rates. Check your lead acid ratings, as most batteries are rated at the 20 or 100 hour discharge rates.  

Our cells provide 100% of their rated capacity when discharged in 5 hours. When discharged over 20 hours (the lead acid standard), our batteries provide up to 118% of their rated capacity.  This means you are getting almost 20% more capacity in every cell.  There are absolutely no lead acid batteries that can stand up to this level of performance - especially when you look at capacity over time.  

Cell Sizes

Please take a look at the cell size guide to get an idea of total battery footprint. All cells come in a clear case that lets you easily monitor electrolyte levels of your battery.  There are multiple cell capacities that come in the same size container - 200-300Ah, 400-700Ah, and 800-1000Ah. Our most popular sizes are 300Ah, 500Ah and 800Ah. 

The 100Ah cell and the 200Ah cell are great for a small remote pumping station or somewhere that space is tight.  The 300Ah offers a great value, and each cell has an integrated handle that make setup very easy.

The 400Ah, 500Ah, 600Ah and 700Ah cells are twice as large, and are our favorite cells to work with.  The volume of electrolyte in each cell nearly doubles from the previous group, which this means less watering frequency. The design of these cells is truly industrial. The largest group of cells, 800Ah, 900Ah and 1000Ah, feature a huge electrolyte volume but are still easy to install and maintain.  


​The alkaline electrolyte used in the NiFe battery is a combined solution of potassium hydroxide (KOH) and​ lithium hydroxide (LiOH), which can improve the battery's performance (e.g. cycling life, energy efficiency, wide operational temperature range, etc), allowing it to reach the optimum level. The different standard concentrations of electrolyte allow the NiFe battery to be operated within a temperature range of -22F up to 140F, or -30C up to 60C, which makes the battery able to withstand wide temperature fluctuations that exist in some remote regions.

The electrolyte of the Nickel Iron cells does not enter into chemical reaction of the cell, but acts merely as a conveyor of ions from plate to plate.  The specific gravity does not fluxuate during charge and discharge, so we don't follow specific gravity when operating the Iron Edison battery.  Specific gravity is only important when you mix a new batch of electrolyte.   Considerable variation in specific gravity is permissible, with only minor effects on battery efficiency.

Every Nickel Iron battery ships as a HazMat item.  If your battery isn't shipping hazmat, you are not in compliance, and may face serious penalties including forfeiture of shipment.  Iron Edison is fully certified to handle your hazmat battery shipment. Consult the Materials Data Safety Sheet for proper handling information, and lways wear your safety gear.


The action which takes place in an Edison cell, both in charging and discharging, is a transfer of oxygen from one electrode to the other, or from one group of plates to the other.  This type is called an oxygenlift charge equation. In a charged cell, the active material of the positive plates is superoxidized (nickel(III) oxide-hydroxide) , and that of the negative plates Fe(OH)2 is in a spongy or deoxidized state.

The normal charge rate for the battery is C/5.  This is the Capacity of the Battery (in Amp hours) / 5 hours from full to empty = The discharge current (your C-rate).  For a 500 Ah battery, the C/5 rate is 500/5 = 100 Amps per hour of charge current.  You can charge the battery using any MPPT or most PWM charge controllers and achieve specific charging voltage.

The Nickel Iron battery is able to withstand a Boost Charge, and these short duration high rate charges can be given provided that the temperature of the electrolyte does not exceed 115 F. These short charges are very efficient and cause no injury to the cells. Rates up to three times normal can be employed for periods of 30 minutes.  

Normally, we charge the battery to a voltage of 1.65 Volt per cell (or just above).  With a 12 V nominal battery, we use 10 x 1.2V cells.  When charging, this 12V battery should achieve a voltage of 16.5 Volts.  

When working with specific inverters, we may recommend using one fewer cell in series.  This allows us to achieve the higher per-cell voltages without going over the inverter limits.  Because our batteries perform at up to 118% of rated capacity, the nominal loss of a single cell does not affect total capacity.    

In general, these cells like to be worked!  Charge them up and push your batteries hard with a heavy load.  You will find that your battery performs better with heavy use than if you let it sit in float charge.


In discharging the positive plates deoxidize and the oxygen, with its natural affinity for iron, goes to the negative plates, oxidizing them. It is permissible to continuously discharge up to 25% above normal (this would be about C/4).  Occasionally and for short periods, rates up to six times normal can be achieved (this would be about 1C)

Optimum Charge / Discharge Rate: C/4

...Where C is the capacity of the battery in Amp hours

EX: 400 Ah battery

C / 4 = max charge or discharge rate

400Ah / 4h = 100 Amps per hour is the max charge or discharge rate 


The Industrial Series Nickel Iron batteries are imported from one of the largest battery factories in the world, located in Sichuan province of Western China.  Our production facility has been building batteries since 1971, and is known for producing the highest quality batteries available.

Our renewable systems have components from all over the world.  The battery racks are from Italy, the breakers are from South Africa.  The breaker boxes and battery cables are Made in the USA.  We strongly support American businesses whenever possible. 

After thorough testing and with scores of happy customers, we proudly stand behind our brand-new batteries with a 10 year warranty.  Learn more about what our customers are saying here:

The Last Battery you’ll Ever Buy.

Over a century ago, Thomas Edison found a battery design that he considered to be nearly perfect. Today, Iron Edison is proud to offer an updated version of this incredible design that is specifically manufactured for Renewable Energy systems.

An Iron Edison Nickel-Iron Battery
  • Refillable alkaline electrolyte
  • Large storage capacity (up to 48 kWh)
  • Full depth of discharge
  • 12, 24 and 48 Volt applications
  • Nearly indestructible

Iron Edison now offers a full line of solar panels, charge controllers, inverters and more!

For more information on the advantages of Iron Edison batteries and on our company, check out our About page. Technical specifications and operating procedures can be found in our Reference Library.

A brighter future, off the grid.

A brighter future. Off the grid. Iron Edison battery systems can be used for 12, 24 and 48 volt applications. We can also help you optimize battery capacity to take better advantage of the solar, wind and other hardware you may already have in place.

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