Your actual photovoltaic system (experience)?

I would be interested in the experience and strategy regarding your real roof-mounted photovoltaic systems:

To get maximum capacity on the roof, the panels will be mounted almost flush against each other.
So the installation starts at the top, the panels are mounted row by row and pre-assembled accordingly.
Then the next row below, and so on, down to the bottom.
So far, so good.
But if you have to replace a panel (hail damage, contact corrosion, etc.) or just do a diagnosis, it becomes quite complex.
Stepping on them is not an option!
No one will want to start removing the panels from the bottom just to reach one panel in the middle.
Alternatively, a temporary mounting scaffold could be installed, which is of course also complicated/expensive.
As the number of panels and operational time increase, the probability of failure rises proportionally.

so what?

How do you solve the problem
(except if it has not arisen so far)

I cannot report on a "real experience" since no problem has occurred so far (hopefully), but I assume that in case of a problem, the effort you described would indeed be necessary. However, one tries to reduce possible problems by not building such long strings and/or using performance optimizers per module. The latter would, in the event of a defect, only "shut down" the corresponding module and allow the rest to continue running. However, they cost around 50 EUR per module... Some module manufacturers have already integrated corresponding technologies into the modules.

I am interested in the experience and strategy regarding your real roof-mounted photovoltaic systems:

Our strategy is a minority strategy and not recommended for anyone who prioritizes economic efficiency. Our goals: use of effectively green electricity, self-sufficiency, aesthetics, and enjoyment in dealing with technology and the future.
The system should be basically invisible on the roof (which immediately kills economic efficiency if you use solar tiles). We aim for a high degree of self-sufficiency and have a few unnecessary consumers such as a whirlpool. This results in (upcoming) oversizing of the batteries from the currently manageable 8kWh to a questionable 15 kWh. Since I do not want to pay a renewable energy surcharge on self-consumption for emotional reasons, we installed 9.99kWp. With the new regulation, a photovoltaic system with 6-7kWp will now be installed on the carport; here we are testing a shingle as a reference system, developed by a friend, which does not provide the maximum area yield but brings me joy. In a few years, I will build a system like the one currently being developed by Methanology. That will certainly be totally uneconomical. But then I can cut off the supply line from the utility. Goal achieved.
I have already spent money on financially dumber things without regretting it, for example on a motorhome (renting would have been cheaper than buying new) or many restaurant visits (very uneconomical).

If you demand high economic efficiency from your photovoltaic system: don’t copy this.

So I have installed two rows on top of each other in three cardinal directions. If a module in the upper row is defective, the module below is removed and can be taken out. Of course, this always depends on the roof shape and height. Since we have a bungalow, this works very well and easily with a better ladder.

so I have two rows each stacked on top of each other mounted in three cardinal directions

This description creates an image for me that makes no sense. Please help me understand – maybe with a photo.

two rows of modules stacked on top of each other. And that on the east/west and south roof surface.