Energy "concept" for old farmhouse

Good evening everyone,

my wife and I are looking for a concept for the future energy supply of an old farmhouse. I hope this category is the right one, otherwise please move it.

General: The farm is in a remote location, the nearest houses are about 500 meters away. The farm will have about 300 sqm of living space in the future (more would also be possible) and is connected to the public power grid and sewer system. Heat and hot water are currently generated by a gas instantaneous water heater (gas comes from a liquefied gas tank). We will largely renovate this farm. The walls are made of half-timbered construction (straw + clay) and will be redone. As part of this renovation/conversion, all installations (electrical and sanitary) will be replaced. Now we are considering how we can plan the future energy concept of the house.

A few facts about the conditions.

[*]Next to the farmhouse is a barn facing south-southeast (about 25-30 m away). We have an available area of about 80 sqm on this roof. The roof was redone 10 years ago.
[*]The farmhouse roof is about 25 years old. It is currently not planned to redo this roof. The question here is to what extent a photovoltaic system or a solar thermal system makes sense if the roof has to be redone in about 20 years. There is about 60-70 sqm of space. The orientation is southwest.
[*]There is plenty of space around the farmhouse. For all forms of energy that require a lot of space, there is enough room – only a wind turbine will not work J.
[*]On one side of the farmhouse there is a forest. This forest belongs to the farmhouse and could provide wood “for free.”

For the renovation, we are now considering how we want to generate heating and hot water in the future. In addition, we are thinking about generating electricity for self-consumption/feed-in by means of a photovoltaic system.

We had considered, among other things:

[*]Construction of a sufficiently large tiled stove to heat large areas of the house.
[*]Solar thermal for hot water generation (only makes sense on the main house – or can hot water be routed underground to the main house?)
[*]Photovoltaic system for electricity (possibly with storage?) – this could also be massively over-dimensioned for feed-in purposes.

Basically, we are open to all ideas – but tend towards renewable energies (provided it is reasonably economically viable).

From the experts' point of view, what makes the most sense here?

Oh yes, one more addition regarding heating.

I am a fresh air fanatic ... heaters where you are not allowed to open the windows are a horror for me.

First of all, we would need to know which energy standard you are trying to achieve. Regardless, my opinion is that solar thermal energy is nonsense. To heat large parts of the house with a tiled stove, you would probably need to get a house slave to effectively use it, who chops and stacks several cubic meters of wood in the summer and then constantly loads it in the winter.

Solar thermal energy is not cost-effective. Storage for photovoltaics is (still) not cost-effective either. But I would provide for it to be able to retrofit it later. With the theoretically available size of the photovoltaic system, a heat pump would make sense. Even on bad days, most of the electricity should be available. Are you planning with underfloor heating? Heat pumps are for low temperatures...

own forest, large heated area - if there is enough space (possibly outbuildings), an external firewood or wood chip system could possibly be considered/planned for you.

Photovoltaics would then be a pure investment with amortization through feed-in, independent of the heating system.