Photovoltaic system, how to use experiences like heat pumps?

It's really just a gimmick. You do know that this is only about a few cents per wash or drying cycle (comparison own electricity vs. external electricity)? A single beer at the pub cancels out the advantage of a whole month of optimal drying and washing. Well, okay, but you definitely earned that one extra beer...

I'm curious when you will plan a photovoltaic system :P

Ideally, I will install an empty conduit. If I ever have 20k extra, I will buy some Divi shares and enjoy nearly 1,000 EUR in dividends with about 7% dividend growth per year.

And why are you laying a conduit then? And why 20,000 euros? Thanks to half-knowledge, or what?

9.9 kWp and a battery? 20k? Round about?

According to the general contractor, the empty conduit "costs nothing" – he probably meant figuratively just a little and not nothing, but maybe photovoltaic + storage will become profitable someday? Could be? Then it can be retrofitted if the kWp costs 300 EUR and the 30 kWh storage is available for a total of 500 EUR and inverters last 40 years...

Edit: One should be allowed to dream...

: I have a 30kWp system on the roof. It pays for itself in < 10 years... Investment around 50k net, yield 2015 > 5.2k net (self-consumption of about 3000kW on top) why should anyone wait any longer??