jx7
2015-09-11 14:56:28
- #1
With the addition: 'when fed in' - then you have to calculate: when how much is fed in, and what the overall balance looks like over the year. However, this mainly depends on individual consumption behavior. Only when a large part of the energy is stored for individual needs can one generalize again and set the 30° south orientation as the best possible orientation.
I see the difference between photovoltaics and solar thermal as follows: Solar thermal for hot water is useless during the day when no hot water is needed and only needs to work well in the morning and evening. Electricity is also needed a lot in the evening when the residents are at home, but at least during the day you have the possibility to feed the generated electricity into the grid, even if this is not quite as advantageous as using it directly yourself. (Without a very expensive photovoltaic battery storage, the self-consumption rate is probably around 20-30%, with storage around 80%.)
It should also be noted that as a feed-in operator you become an entrepreneur and have more work with the tax return.