That is TESVOLT

TESVOLT specializes in battery storage for commercial enterprises. We produce lithium-ion-based electricity storage units that can be connected to all renewable energy producers in the low-voltage grid: sun, wind, water, biogas and combined heat and power. All TESVOLT storage tanks are produced in our own production facility in Germany. The intelligent cell control is certified by TÜV Rheinland.

The innovative company from Lutherstadt Wittenberg produces electricity storage with the most modern battery cells: prismatic lithium cells from Samsung SDI based on nickel-manganese-cobalt-oxides.

Tesvolt was awarded in 2018 with the German Founder Award in the category "Rising Star". For the off-grid power supply of an avocado farm in southwestern Australia, Tesvolt received the "The smarter E award" in the category "Outstanding projects" in the same year.

Daniel Hannemann and Simon Schandert founded the company out of motivation to further promote the use of renewable energies. Previously, both worked for many years in the photovoltaic industry. Incidentally, you named TESVOLT after the battery inventors Nikola Tesla and Alessandro Volta.