17th February 2021

The “Bergkristall” (Mountain Crystal), a mountain hut situated at an altitude of 2,883 meters in the Monte Rosa Massif of the Valais Alps, has been largely energy self-sufficient since 2010.


Along with thermal solar collectors, a photovoltaic system integrated in the hut’s southern facade ensures a high degree of energy self-sufficiency and a reliable energy supply.


Since 2010, all of the building’s performance data, such as solar energy generated and battery capacity, have been bundled in Siemens Navigator, the cloud-based building performance platform.


Ongoing analysis of the energy flows revealed that the lead batteries in use since the hut’s opening would soon reach the end of their life. This prompted the operators to put a new solution in place.


Siemens was awarded the contract to design the entire solution and replace 48 lead batteries with 14 lithium iron phosphate (LFP) batteries with a capacity of 215 kWh.


Thanks to regional airline Air Zermatt, approximately 8.6 tons of lead batteries were transported out and the nearly 2.7 tons of lithium batteries helicoptered in to the Monte Rosa Hut.


Following an initial trial with two batteries, technicians successfully connected the newly installed batteries to the energy supply system in just two days.

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