Single-family home in Upper Austria

Solar-powered house technology and 750 € operating costs per year

Facts about the project

Client / Owner / Planner
Construction type
Construction year
Operation mode
PV power and orientation
Heat storage size
System control with
Space heating energy demand
PV Projekt Außenansicht

In a new single-family home, AC•THOR replaces the conventional building installation and enables both hot water and space heating with solar power. It uses the excessive yields of a grid-connected photovoltaic system on a linearly regulated basis. Missing energy is drawn from the public electricity grid.

Why „cable instead of pipes“?

In a building, which is built or renovated according to today's standards, water-based heating systems are oversized. High cost of material and time for installation are no longer up to date.

The 100,000 Euro home

The owners managed to realize their personal living dream with a construction budget of less than 100,000 Euros. This objective could not be achieved with a conventional, water-based heating system. The second goal was to keep the later operation low-cost and sustainable.


The Power Meter detects energy flows of the PV system. Via Ethernet it transmits excess energy data to the 3 kW AC•THOR PV-Power-Manager. As a result, only energy that is currently available is used to generate heat. Power feed-in is avoided as much as possible. PV self-consumption is maximized and the public power grid is relieved.

Operating cost

Compared to an installation version with a heat pump, the operating costs can be reduced by more than 30 %. How can a system with electric direct heating require less electricity from the grid than a heat pump? A heat pump can "only" generate heat. It offers no benefit for electric appliances. In opposite, photovoltaic power in combination with AC•THOR supplies primarily electric loads, secondarily it contributes to hot water and space heating and reduces operating costs.

Seasonal performance factor > 5,5

In combination with a 10.98 kWp PV system, a seasonal performance factor of more than 5.5 can be predicted for heat generation. How can a system with electric direct heating have a seasonal performance factor? As with heat pumps, the seasonal performance factor describes the ratio of heat output to electric input. However, while a heat pump additionally absorbs energy from the environment, the energy for AC•THOR comes from the sun through the PV system. The big advantage is that, instead of heat, electricity is available for energy distribution. "Cables instead of pipes" make the system much easier and less expensive. A feature that also has a significant impact on maintenance costs.

Personal customer opinion and resumee

"Photovoltaic has become so cheap that we decided with conviction to carry out the building installation completely PV powered. It is low-cost and easy to install and we save money in operation."

PV Projekt Seite
my-PV Power Meter
PV Projekt Front
PV Projekt Außenansicht

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