It’s safe up to 800W power. Beyond that still safe - if you have new cables/ a newer house. Old houses typically have tiny cables built into the walls. That was the reason for the limitation.

Sure. Zendure, Ecoflow, Anker, Growatt are some brands. Take care not get stuck in this rabbit hole ;-)

They are somehow the same. I bought Zendure Solar Flow Pro as it can get connected through local wifi to my smart meter (Shelly 3EM) and you don’t need an app or cloud. It can run offline. With the smart meter I can control the Zendure when to send how much power and when to store it. If you aren‘t connected to a smart meter it will always feed into the home grid.

I recommend to buy a battery including an inverter as one device. You can attach up to 4 PV panels with 2kw at all (German laws). You plug it into your home power grid through a standard power plug. Same as you would plug a light but it feeds power.

Costs for 1,6kw battery with inverter, 2 panels with 900w, cables and fixturew are 700€. Altough prices increase slightly with spring ;) I produce around 1,20€ worth power each day. On average and including cloudy winter days, I assume 1€ a day = 365*1€ *2 years. Payback under 2 years

And half of this great story is a grassroot story. Private solar counts for a huge share of overall power. And currently most of installed battery storages.

For Non-Germans: Our utility companies try for ages to stop or at least slow the power generation transformation. It reduces their customers quite strongly and those companies are very intervened with politics unfortunately. However, the citizens grass root can‘t be stoped anymore.

The new chapter in this book is: Small Balcony PV‘s. It gives even rented appartments the opportunity to harvest sun energy and reduce the power bill. Great payback with under two years. I love mine.