Photovoltaic offer with storage experiences?

Well, if I simply take the assumed data, then after 20 years I come to a profit of roughly €6,000. Without additional costs for installation, without degradation, insurance, defects, etc. You benefit from the elimination of VAT obligation for own consumption and the non-consideration in income tax.

Whether the 50% energy consumption is accurate, you have to judge yourself. This is possible with storage. However, if the storage does not last the full 20 years – and that is to be expected – then your energy consumption will collapse without new investment. All of this detracts from the above result.

I find the yield forecast quite low. Is the north side that bad or are there difficult conditions, shading, etc.?

No idea how he comes to that. It's not 100% north/south. I think about a 10-degree deviation. There are trees on the south side. On the north side, there is a house that is slightly taller than mine. It's just not free-standing in a field. So, not ideal. And he calculates with 47ct/kWh. That will soon be "capped" at 40ct. Reasonable companies are really hard to find right now. There are plenty of scammers. I would be grateful for recommendations (I'm located in NRW Cologne/Düsseldorf).

It has always been the case that providers have liked to present their offers with future price increases calculated attractively. The question is, what happens after the cap? Does everything normalize a bit again, do prices stagnate, or do they continue to rise?

My same calculation as above with 40 cents electricity price and only 3,000 euros remain. At 35 cents, it breaks even. But as I said, all under the above assumptions, e.g. a storage lifespan of 20 years.

Thank you for the assessment. It seems to be more a matter of principle. Or the good feeling of being able to produce some electricity yourself if necessary. (Inselbertieb) The question is - for what. If you might ever need it, you probably have other worries as well.

1. Delete documents immediately! (why do I explicitly not write here) The degradation is very roughly estimated at 10%. Real life so far shows significantly less (around 3%). However, the assumptions regarding feed-in tariffs are optimistic in quantity (too much?). We can hardly assess self-consumption here as we do not know the further living conditions and consumers (heat pump, family size, etc.). Interest rates are optimistically low or is there a concrete offer? (On the other hand, you already have enough cash in your position, right ;-) ?) The roof seems to be around 35-40°? Why only about 8KWp? The 47 cents in the calculation of course look better for the seller. But you know your way around Excel, just adjust it yourself ...

with storage and island operation

What is the goal? To be self-sufficient during longer power outages or just to bridge a short outage? In the first case, be sure to make sure that the inverter is black start capable.