Protection against power failure

A 30 kWh BlueSky Energy electricity storage system protects against power outages and optimises self-consumption

Our partner Elektrotechnik Nösterer is a pioneer in PV installation. More than 20 years ago, he installed the first PV system in Austria. Starting as a one-man business, he now employs six people. The company founder Andreas Nösterer has been self-employed with his company since 2006. With his BlueSky Energy storage system, he will be able to protect himself against possible power outages in the future.

Photovoltaic modules on his own company building

PV Nösterer

PV on the roof Source: Elektrotechnik Nösterer

There are 30 kWp of PV on the company’s own building. The modules are DC coupled in an east/south and west orientation. AC coupled with Fronius, also in east/west and south orientation. 12 kWp modules alone are on the facade of the company building.


Quelle: Firma Nösterer

BlueSky Energy power storage backs up in the event of a power outage

n spring 2019, there was a regional power blackout that lasted a whole two days. Unimaginable for Nösterer and his team. To counteract this, he installed a power storage unit that is able to operate completely self-sufficiently. In the event of a power failure, the storage unit switches to a stand-alone grid in a few milliseconds and reliably supplies the PV and other systems with electricity. This feature is essential, especially for safeguarding the technology, IT data and photovoltaic system contained in the company.

Daily and nightly peak loads can be capped


Energy flow over the course of the day (when using a photovoltaic system with energy storage)

The storage unit also serves to optimise self-consumption. Peak loads can be easily capped by the storage unit. As shown in the above diagram, load peaks (red line) usually occur when the sun is no longer shining. This means that the energy generated from the sun cannot be used efficiently without electricity storage. With storage, the generated and stored energy can be used when it is needed most. Namely, exactly when the photovoltaics are no longer working. As a result, no additional energy has to be purchased from public electricity providers. Self-consumption is optimised considerably. In addition, the power flows can be intelligently programmed with the integrated energy management system.

Furthermore, the storage unit also serves as a “showroom” in this project. Since Mr. Nösterer himself has a storage unit on site, he can demonstrate it to his potential customers and explain how everything works using a practical example. The storage unit is safe, sustainable and non-combustible.