Heiwit sodium ion batteries have been tested and certified by TÜV SÜD.
Below are the main values for the operating temperature as indicated
in the official document of conformity.

Main values

• Operating range: by -25 °C a +60 °C
• Range at full power: by -25 °C a +40 °C
• Storage range: by -40 °C a +70 °C
• Relative humidity: 0-100 %RH

What do these intervals mean

Operation indicates the temperatures at which the battery can safely operate.
Full power defines the range in which the battery can deliver its rated power continuously.
Storage refers to the recommended conditions for transport and storage when the battery is not in use.

These results are certificates by a third party (TÜV SÜD) and offer guarantees of
reliability in both cold and hot climates. To maximise performance and durability it is always
installation in accordance with the manual and current regulations is recommended.

A wide certified temperature range simplifies plant design and reduces the need for
auxiliary thermal conditioning systems, with advantages on reliability and operating costs.