ᐅ Upcoming Roof Replacement: What Are the Options for Solar Panel Installation?

Hello dear forum,

I would like to hear your opinion on the following situation:

The roof of a single-family house is planned to be replaced around 2023.
There has been a photovoltaic system on the roof since 2003 (which means it will lose its feed-in tariff in 2023).
The house is rented out.

Question: The roof needs to be replaced, there is no way around it.
Would you recommend installing new modules on the new roof, or continuing to use the old ones, for example, for another 10 years?
The idea is that the tenants could use the electricity for their own consumption.

Thank you in advance for your input!

Theoooo schrieb:

Would you rather install new panels on the new roof, or keep using the old ones for, say, another 10 years?

New = newly purchased = high investment.
There was recently an update to the Renewable Energy Act, which apparently still allows for economically viable continued operation (at least according to reports). I would wait and see exactly what the regulations will be.

Theoooo schrieb:

The idea is that the tenants can use the electricity for their own consumption.

In that case, you are selling the electricity as a business to the tenants. That always determines how the contracts need to be structured.

Are the panels damaged, or do they still perform well?

Hi, you will probably receive around 50 cents feed-in tariff. The tariff depends on the modules. Calculate how many kWh you will generate in three years at xx cents each. Alternatively, a new system (likely twice as efficient? with the same area) at about 8 cents feed-in tariff. Always deduct your own consumption. Then you can estimate if an additional dismantling and reinstallation of modules pays off (based on the difference).

Roughly, I would guess: yes, it only makes sense to put the old modules back on...

superzapp schrieb:

Alternatively, a new system (presumably twice as efficient? with the same area) at about 8 cents feed-in tariff.

The system will only be installed in 2023!

superzapp schrieb:

Each time minus self-consumption.

No self-consumption. Tenant electricity model. The Renewable Energy Act amendment is also expected to bring increased bonuses for this.

@nordanney
Yes, you’re right, I read too quickly. That only leaves reinstalling the old modules.
By self-consumption, I actually meant more generally "not feeding into the grid."
Well, we initially wanted a tenant electricity model as well. For us, it will probably be "rent including a fixed electricity allowance." I don’t think that way you become an electricity supplier. The details could perhaps be discussed in a "specialized forum."

Thank you all for your replies!