seth0487
2019-02-22 13:17:34
- #1
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Actually, my primary concern is self-consumption; until now, I didn’t know about taxes on feed-in – is it mandatory to feed in?
This is a common misconception that it’s better to avoid feeding in and try to consume as much as possible yourself. It would be fatal to give up the guaranteed 12 cents per kWh for feed-in! Currently, a photovoltaic system owner is guaranteed that your fed-in kWh will be remunerated with 12 cents over 20 years.
Self-consumption only puts the icing on the cake. Because through self-consumption you save about 30 cents per kWh. In contrast, you do not receive 12 cents for feeding in the self-consumed kWh. This means that for each self-consumed kWh you save about 18 cents per kWh. So it increases your return or shortens the payback period.
Ideally, you would consume everything yourself and not draw anything from the grid. But that is unrealistic. In summer, you have a huge surplus because you usually consume little electricity. And in winter, you don’t get enough from the roof to cover your high electricity consumption.
A storage system would only make sense in summer, as you can use the surplus from the day during the night.
In winter, the few kWh produced during the day are usually consumed yourself. So there is nothing (or not much) to store.
Complicating matters is that storage is currently still so expensive that it simply doesn’t pay off through "night consumption." You only save "18 cents per kWh" after all...