ᐅ Is a solar power system cost-effective for us?

Hello,

we are currently considering whether to install a solar power system. I have noticed there are various opinions on this topic, but individual factors also play a role. Apparently, it might not be financially beneficial for us, or I may be overlooking something.

Here is our current situation:
- Quote for a 5 kWp solar system with everything included: just under 10,000€ (approximately $10,000)
-> 500€ (approximately $540) annual depreciation
- Interest on 10,000€ (approximately $10,000): 100€ (approximately $110)

---> 600€ (approximately $650) annual costs

Income:
A 5 kWp system apparently generates about 4,500 kWh.
We currently consume 1,500 kWh annually, but there are only two of us so far.

So, I roughly save 800 kWh x 0.30€ = 240€ (approximately $260) for self-consumption and receive 3,700 kWh x 0.08€ = 300€ (approximately $325) feed-in tariff.
That makes a total income of 540€ (approximately $585).

The hard part to estimate is the share of self-consumption covered by the solar system. Since we are not home during the day and mostly use appliances in the evening, I find the 800 kWh out of 1,500 kWh estimate rather optimistic.

If not all new buildings around us had solar systems, I would not hesitate further, but maybe my reasoning is flawed?
What do the solar system supporters say?

Thanks for your assessment!