this post was submitted on 20 May 2025
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Balcony solar panels are dirt cheap, you can get them for 200-300€, including the micro inverter. You usually do not have batteries in these setups, you just use up the generated power while it is available by moving things like the dishwasher and dryer to that time.
To give some actual numbers, I pay 0.22€ per kWh right now. In the last 30 days (Apr 21 - May 20) the balcony solar panels generated 74.11kWh. The month was fairly average with an even mixture of sunny days and rainy days.
Assuming you can use up the 800W of peak power, you will have saved around 16€ in just those 30 days. I don't have full data for the year yet since I only got mine a few months back but my current estimation is that it will have paid for itself after 2-4 years.
How are you getting power to your appliances? Someone else suggested back feeding into an outlet which is illegal in the US.
Back feeding is legal here if it is connected to a micro inverter which can turn off immediately when disconnected and never outputs more than 800W.
And this is the answer to why it makes sense in Europe and not the US.