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



Module TB-2.4 TB-5.4
Nominal capacity 2.4 5.4 kWh
Boost mode 4.8 10.8 kWh
Continuous power 1 2.5 kWh
Peak power 2 5 kWh
Round-trip-efficiency 75 75 %
Nominal AC voltage 220 220 VAC
Temperature range -40 to +45 -40 to +45 ºC
Expected life cycles 7500 7500 cycles
Service life 20+ 20+ years
Warranty 10 10 years
Dimensions (L x W x H) 1.3 x 0.4 x 0.7 1.3 x 0.5 x 1.0 meters
Total weight 250 500 kg
Enclosure material Eco-plastic/Corten Steel/ Wood Eco-plastic/Corten Steel/ Wood

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.

Includes the self-service maintenance package (Materials, training, and documentation provided. First maintenance is free with training and lifetime support)
Company-service maintenance package: Bi-annual carefree maintenance by professionals. This is billed annually starting from €320 per year and depending on distance. Only applicable in Netherlands or countries with certified partners.

Are you looking for a commercial-scale system (>100kWh) and/or a custom system (0.5 kWh to 75 kWh per module), then click here for more information.

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

Total Estimated Price€ 

Power smarter and make the world circular.

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