That is not your bog-standard balcony solar installation and a 5kWh battery is way too much. You can get a 800W installation for 250-350€:
Let’s say 300€. At 0,30€/kWh you reach your ROI at 1000kWh produced. Production depents on your locality, but it should be between 800-1100kWh for a 800W installation. So it takes approx. 1 year to get your investment back. The rest is pure profit. Yes, that might take a bit longer in practice. You are not using the full 800W at noon on workdays while you’re away at work. You might not have perfekt alignment with the sun. And so on, but it is really quick.
If you are paying 0,15€/kWh, you might need 2 years to reach that ROI. That still is an awesome investment. Take a small sum of money. Invest one or two hours of work installing it. And if you are calculating with German prices and 10 years lifetime, you get 1000kWh a year @ 0,30€/kWh for 10 years = 3000€.
I ran fine with 2kWh storage and 1.6kWp, so yeah anything bigger than that might idle and therefore just delay breaking even.
not using the full 800W at noon on workdays
That’s why I would still recommend any battery. Not just to save some energy into the evening where electricity prices regularly spike in germany, but also to store in short-term when running a laundry machine on a so-so day.
Nonetheless, those small solar plants are likely always viable and I do regularly recommend them even if not asked :)
That is not your bog-standard balcony solar installation and a 5kWh battery is way too much. You can get a 800W installation for 250-350€:
Let’s say 300€. At 0,30€/kWh you reach your ROI at 1000kWh produced. Production depents on your locality, but it should be between 800-1100kWh for a 800W installation. So it takes approx. 1 year to get your investment back. The rest is pure profit. Yes, that might take a bit longer in practice. You are not using the full 800W at noon on workdays while you’re away at work. You might not have perfekt alignment with the sun. And so on, but it is really quick.
If you are paying 0,15€/kWh, you might need 2 years to reach that ROI. That still is an awesome investment. Take a small sum of money. Invest one or two hours of work installing it. And if you are calculating with German prices and 10 years lifetime, you get 1000kWh a year @ 0,30€/kWh for 10 years = 3000€.
I ran fine with 2kWh storage and 1.6kWp, so yeah anything bigger than that might idle and therefore just delay breaking even.
That’s why I would still recommend any battery. Not just to save some energy into the evening where electricity prices regularly spike in germany, but also to store in short-term when running a laundry machine on a so-so day.
Nonetheless, those small solar plants are likely always viable and I do regularly recommend them even if not asked :)