Photovoltaic system 120 sqm living area - cover the entire roof?

So, we had our measurement appointment today.
We will fully cover both sides of the roof. Depending on shadow calculations, this should yield around 12 to 15 kWh each.
We will include one storage system for calculation.
How expensive it will be depends greatly on what additional goodies are included.
Storage (10kWh) was estimated for us at €5,000 (subsidy in NRW is €100 per kWh), so €4,000 after that.
The storage modules (completely black) cost us about €230 per module.
Now it gets technical: The modules are connected in strings. Let’s say 8 modules are connected to one string. Each module can only deliver as much power as the weakest module (for example, one produces less due to shade). This can massively reduce the yield of a whole string. To prevent this, there are "plugs" (power optimizers) that make each module individually "controllable." Of course, a suitable inverter is needed as well. Such a plug costs about €60 per module. That adds up quickly. If you forgo these gadgets and, for example, implement a [Satanlage], it will logically be cheaper.

Otherwise: the larger the system, the cheaper it becomes proportionally and the faster it pays off (through feed-in and optimal storage use/self-consumption).

Another argument in favor of PV (especially for south-facing roofs) is the excellent protection against summer overheating. Therefore, really cover the roof fully and avoid shading as much as possible. A storage system only really pays off if you receive subsidies for it (either direct subsidies or by reaching a better KfW level). Unlike photovoltaics themselves, you can easily retrofit storage systems later.

If possible, could you please then post the total sum of the investment including working hours etc. to get a sense of it. Thank you

We will fully cover both sides of the roof.

So now: also panels on the north side (NE - NW)?

How much sunlight do you expect there? Especially in the winter half-year, when the sun is lower, it will probably be rather dim there?!?

Or what kind of exotic roof shape is that?

like now:
also panels on the north side (NE - NW)?

How much sunlight do you expect there?
Especially in the winter half-year, when the sun is lower, it will be rather dark there?!?

Or what kind of exotic roof shape is that?

It's not unusual. Below 25 degrees tilt angle, north, especially not exactly north, can be interesting.

Yield is given by PVGIS. The rest is simple math.

like now: also panels on the north side (NE - NW)?

How much sunlight do you expect there? Especially in the winter half-year, when the sun is lower, it will probably be rather dark there?!?

Or what kind of exotic roof shape is that?

Normal 35° roof. I can only repeat what the technician told me. The current solar modules are monocrystalline modules. They have a significantly better efficiency than polycrystalline ones. They also capture a lot even in cloudy weather. Accordingly, a north and east orientation is also worthwhile if there is no other shading interfering.

Since we have a heat pump, which I want to supply as much as possible with it in the evening, we need to plan a correspondingly large system so that a lot still comes in in winter even with north and south orientation. In other words, you won’t manage that with a 5kWh system.

if possible, could you please then post the total sum of the investment including labor time etc. to get a feeling for it. Thanks

I will as soon as I have an offer. Currently, I am calculating with 15-30k€. They installed the system in one day.