Nico2xl
2013-03-27 03:14:59
- #1
Hello,
I am currently planning a bungalow for my parents, or rather it has already been planned to meet Kfw70 requirements. A gas condensing boiler with hot water heating through solar thermal energy with 2 collectors totaling 5.5 sqm is planned there. The house has a living area of 110 sqm.
Now I just installed a photovoltaic system on my own house and was thinking about doing the same for my parents. My photovoltaic system installer then asked me why I would still install solar thermal energy at all. He suggested I rather use the entire roof area for the photovoltaic system. Because self-generated and self-consumed electricity is credited according to the Energy Saving Ordinance 2009. Of course, only the self-consumption share of the generated electricity.
Now the question arises for me: how much collector area do I need at minimum to compensate for the missing solar thermal energy with an annual electricity consumption of 2800 kWh? Of which, of course, not everything is self-generated. According to paragraph 5 of the Energy Saving Ordinance, the calculation is apparently quite complicated with monthly evaluations etc.
Has anyone of you already had experience with this? At least an 8 kWp system would fit on the roof.
I would really like to implement this because, first, I would like to save the 300 L hot water tank in the utility room, and second, I am not really convinced by the "cost-benefit factor" of solar thermal energy.
Of course, I will ask this question to the photovoltaic system installer + structural engineer/energy certificate calculator, but before making a big fuss, I thought I might get some preliminary information or experiences.
Nico
I am currently planning a bungalow for my parents, or rather it has already been planned to meet Kfw70 requirements. A gas condensing boiler with hot water heating through solar thermal energy with 2 collectors totaling 5.5 sqm is planned there. The house has a living area of 110 sqm.
Now I just installed a photovoltaic system on my own house and was thinking about doing the same for my parents. My photovoltaic system installer then asked me why I would still install solar thermal energy at all. He suggested I rather use the entire roof area for the photovoltaic system. Because self-generated and self-consumed electricity is credited according to the Energy Saving Ordinance 2009. Of course, only the self-consumption share of the generated electricity.
Now the question arises for me: how much collector area do I need at minimum to compensate for the missing solar thermal energy with an annual electricity consumption of 2800 kWh? Of which, of course, not everything is self-generated. According to paragraph 5 of the Energy Saving Ordinance, the calculation is apparently quite complicated with monthly evaluations etc.
Has anyone of you already had experience with this? At least an 8 kWp system would fit on the roof.
I would really like to implement this because, first, I would like to save the 300 L hot water tank in the utility room, and second, I am not really convinced by the "cost-benefit factor" of solar thermal energy.
Of course, I will ask this question to the photovoltaic system installer + structural engineer/energy certificate calculator, but before making a big fuss, I thought I might get some preliminary information or experiences.
Nico