45kWh 18650 DIY Powerwall + 9kW Solarpower in Germany

MASSIVE restock of EV Batteries at www.batteryhookup.com 5% coupon "POWERWALLS"


Active member
Dec 15, 2018
Thanks for sharing this. I was struck by the excellent design / very good advice that for a serious system its significant work and its really good to enjoy learning/knowing the details before taking a project like this on + it is a personal responsibility choice dealing with lithium-ion cells. Very nice system and work!!

The fireproof cabinet in-house was interesting - and the tone (if I got it right) that it may not stop a run-away event but should give time to react. The idea of buying time seems valid to me as a design concept (in addition to all or nothing).
Last edited:


Apr 3, 2019
Hello, thank you, we are glad that the work helps others with their projects. Of course, we do not know what the fireproof box can withstand in an emergency. But in the case of a strong chain reaction, we suspect that the box quickly reaches its limits. But exactly, it gives you valuable minutes to be able to leave the house in an emergency or to cool down the powerwall with appropriate fire extinguishers (metal fires).