13. Solar energy

How much energy does our Solar power system produce?

Our photovoltaic system has been producing renewable energy on our barn roofs since May 1, 2009. The roofs are ideally suited for this purpose, as the orientation points south and the inclination is optimal.
The 144 solar modules supply around 26,000 KWh of electricity to the grid per year. That is the annual amount of energy for about five households. On sunny April or May days, when the air is dry and cool, the system delivers the maximum output of 25.2 kWp (kilowatt peak). However, on hot summer days, the output decreases somewhat.
The efficiency of the solar cells has improved greatly in recent years, and the initial cost has dropped by about 60% since 2009.

Do we use the electricity for ourselves?

No. All the electricity produced is fed into the public grid.
For this, we receive the cost-covering compensation for electricity fed into the grid (KEV) from the grid operator.
So we feed about 26,000 kWh into the grid per year and have a self-consumption for house and yard of about 18,000 kWh. Thus, we can easily cover our own consumption of electrical energy and have a positive energy balance.

What is a Kilowatt hour?

What can you do with a kilowatt hour of electricity that costs about 20.5 rappen on average? Here are a few examples:

  • wash one set of laundry with the washing machine
  • iron 15 shirts
  • have 17 hours light of an incandescent lamp (60W)
  • vacuum 60 minutes on medium level (1000W vacuum cleaner)
  • have 90 hours of light of an energy saving lamp (11 Watt)
  • watch 10 hours TV (LED, 107 cm)
  • use a desktop PC for 10 hours