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.
kalleboo@lemmy.world 1 week ago
You plug it straight into the wall, it syncs to the grid and back-feeds it, up to 800W
roofuskit@lemmy.world 1 week ago
Back feeding is illegal in the US.