I often see DIY solar installations that include a DIY battery bank on
line. These often have gleaming exposed bare bus bars and wooden
enclosures. 😮 No BMS! 😮
They are often placed in poorly thought out locations like basements,
attached garages, bedroom closets, etc. 😮
No thought whatsoever as to what might happen if something, anything,
happens to go wrong. None.
In my experience, everyone that has worked with stationary DIY battery
banks or high power EV racing program for any length of time has, no
doubt, had a battery pack fire. If you ask them "Have you ever had a
battery pack fire?" They will deny it emphatically. They will then,
perhaps, tell you about a "friend" that had a_catastrophic_ battery pack
fire.
A battery pack stores a HUGE amount of energy, because that is what it
is designed to do. You have to plan for it to short out, catch fire, and
then release all that energy at any point in its construction or its
use. This is what batteries live to do, given the chance. All of these
cells are patiently waiting for you, (or someone else,) to make a /tiny/
mistake. If you don't carefully make contingency plans, and design
accordingly, the pack will most definitely catch fire eventually. It
will then invite anything near it to "join the party."
You need to think, "What if this thing catches on fire? What will happen
next?"
Bill D.
On 9/30/2025 5:53 AM, (-Phil-) via EV wrote:
https://hackaday.com/2025/09/24/how-regulations-are-trying-to-keep-home-battery-installs-safe/
A few years ago I had a Ternary battery fire in my workshop which caused
about $60k of damages, so be careful out there kids! I was lucky that my
shop is not attached to my house, and it was a metal building, so damages
were limited. One defective cell can cause thermal runaway of an entire
ternary pack, even high quality ones. If you do have ternary ESS, they
should be in steel enclosures with properly engineered vents.
I won't have any large battery systems in/near my home unless they are LFP,
Ternary is just too risky.
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