A nickel-iron based energy storage system. The nickel-iron chemistry is proven to be robust and safe leading to affordable, long-lasting battery cells with minimum environmental impact. This chemistry is ideal for energy storage in combination with renewable energy sources with daily complete cycling at varying weather conditions. 

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Thomas Edison commercialised the nickel-iron battery in the early 1900s as an alternative to lead-acid. The original batteries from the factory are still being used by people around the world.

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We bring back this battery technology, so as the role of renewable energy continues to grow in the future, storing energy can be sustainable, simple, and safe. 


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Extremely long life

  • Design lifetime is 40 years
  • Service life of 20 years with daily completely cycling for renewable integration
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Inherently safe

  • Aqueous (water-based) electrolyte
  • Non-flammable and non-explosive
  • Electrodes do not contain toxic or rare metals, like lead (Pb), Cadmium (Cd), or Cobalt (Co)
  • The chemistry can handle continuous overcharging without experiencing thermal runaway
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Robust operation

  • Operating temperature ranges from -40°C to +45°C
  • Able to withstand deep discharging and overcharging with no permanent damage to cell capacity
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Environmentally friendly

  • Electrodes are composed of nickel (nickel oxide hydroxide) and magnetite (iron oxide), which are abundantly available in nature
  • 100% recycling metal compounds is possible due to the absence of alloy


Standard TerraBattery System

Standard TerraBattery system product details



Energy capacity  11 kWh 
Continuous power 2.5 kW
Peak power 5 kW
Nominal DC voltage  21.6 VDC
Nominal AC voltage 220/230 VAC
Round-trip-efficiency 70%
Design life 40 years
Service life 20 years
Warranty 10/15/20 years
Dimensions 1.5 x 1.5 x 2 meter
Weight 2000 kg
Temperature  -40ºC to +45ºC

Looking for commercial / custom scale systems?
Then go to our custom system page with the link below.

Battery maintenance estimations

Maintenance packages

Battery Estimations

Quick Estimation

Choose the no. of units to know the price in just few clicks.

A fully integrated TerraBattery system
Company-service maintenance package: Bi-annual carefree maintenance by professionals. This is billed annually starting from €320 per year and depending on distance.

Are you looking for a commercial-scale system (>100kWh) and/or a custom system (0.5 kWh to 44 kWh), then click here for more information.

Total price is excl. VAT, transportation & on-site installation

Levelized cost of storage (LCOS) = €0.19

Total Estimated Price€ 

Power smarter and make the world circular.

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