Facts about the project
- Type of building:
- Photovoltaic power, orientation:
- Heat storage size:
- my-PV product in use:
- System control by/with:
A soccer club naturally has a high hot water consumption. Even tough kickers look forward to a hot shower after a match or training session. The soccer field of SV Sierning is located in the immediate vicinity of my-PV's new company location. However, because the field is usually only in use in the evenings or on weekends, it quickly became clear after the installation of a 15 kWp photovoltaic system that the degree of self-consumption in the club building would be very low. So how could the large amounts of PV excess not be fed unprofitably into the power grid, but be put to good use on site? The solution was obvious: Adapt the 1,000 liter buffer storage tank for charging with photovoltaic heat, thereby directly relieving the existing gas boiler. This helps the environment and saves the association money. Thus, not only the hot water is produced photovoltaically for the most part of the year, but also the water-controlled building heating is supported.
However, in order to be able to immediately provide the desired comfort temperature at the fresh water module even with the smallest surplus quantities, it was decided - instead of normal heating rods - to introduce heat via an external heat exchanger. This was built in-house and the 9 kW screw-in heating element from my-PV was installed in it. The stepless power control of the radiator is done as usual by the AC•THOR 9s. In the M7 operating mode, however, it is also able to precisely control the speed of a Wilo heating pump. As a result, the amount of hot water conveyed from the heat exchanger into the buffer is always precisely metered and a thermally ideal charging of the storage tank is ensured.
Immediately after the implementation of the measure at the end of September 2021, noteworthy PV heat yields were already achieved. Thus, SV Sierning is well prepared for 2022 - with clean and renewable energy from its own roof, which can be used immediately in the shower after successful games.
Personal customer opinion and resumee
Warm water demand mainly in summer or in the months with good photovoltaic yields, a high warm water demand in quite fixed intervals and little own use of the photovoltaic system during the week: these are the perfect conditions for a solar-electric implementation of the hot water supply. Thanks to the AC•THOR 9s, it was possible to save over 6300 kWh of natural gas from January to mid-November 2022!
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