A photovoltaic system, no matter how large, is not at all worthwhile either from the perspective of the ground-source heat pump or a high proportion of self-consumption.
With a bit of luck, you break even after 10-15 years. But by then, the end of the lifespan of the modules and/or inverters is likely to be reached.
And even with storage, this scenario will not occur.
This only helps the ecological (cool typo) idea if one recklessly ignores production and disposal. ;-)
The modules are likely to last longer, but the inverters would already be more in the range of Juppi Heesters at 15 years. The whole eco-insulation craze will hardly pay off in most cases. And even at least my green conscience would not be at ease if you look at the rest of the world. In the USA, wooden houses have single-pane glazing and are so drafty that you can fit your finger between the frame and the sliding window.
In winter, they just heat at full throttle.
Conversely, refrigerators are mainly large but so poorly insulated that they run 80-90% of the time. Cars are partly tuned to produce as much soot as possible, otherwise only pickups (gasoline V8), which hardly consume less than 20L.
You hardly ever see anything lying in the truck bed. Africa, China, India, etc.—all environmental regulations are a joke or simply non-existent.
And the German government thinks it can save the planet by sticking 20cm or more of Styrofoam onto houses???
Just for your information, I also try to save electricity, gasoline, etc., and I care a lot about the environment, but the focus would have to be on entirely different things.