General > General Technical Chat
"Gas Armageddon": Energy/electricity prices in EU/UK (and how to deal with them)
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NiHaoMike:

--- Quote from: tom66 on August 27, 2022, 01:19:02 pm ---Fire sprinklers against a Li-Ion battery fire is like trying to put out the Hindenberg with buckets and sand.  That said, putting it on an outbuilding is not too bad, provided you are OK with the cost of losing that building if all goes wrong.

--- End quote ---
The intent of the fire sprinklers is to prevent the building itself from catching fire. And the cost of a rainproof box isn't much.

Or go for a more stable chemistry like LiFePO4 or the various chemistries used in EV batteries.
tom66:
That seems to be the issue.  DIY LiFePO4 is almost as expensive as professional LiFePO4.  If you want a cheap home made power-wall you need to do it with Li-Ion from recycled batteries for the cost to make sense, but now you've basically attached firecrackers to your home/outbuilding/etc.  So you'd better be OK with that risk.  And it's not just rainproofing, it's temperature.  Most Li-Ion cells can't be reliably charged below 0C, LiFePO4 can be but efficiency and charge rate reduces so really best to have somewhere that can benefit from space heating (even if it's just keeping the room above 5C or so)
NiHaoMike:

--- Quote from: tom66 on August 27, 2022, 01:40:55 pm ---That seems to be the issue.  DIY LiFePO4 is almost as expensive as professional LiFePO4.

--- End quote ---
EV battery modules are cheap and considerably safer than the random 18650s used in cheap consumer products.
https://batteryhookup.com/products/lg-36v-7-9kwh-lithium-ion-ev-module
Marco:
Welding up a corten steel enclosure and putting some insulation on the inside plus some automatic fans/heaters is cheap if your time is free. For a hobbyist with a large property, DIY'ing it doesn't seem risky to me.
nctnico:

--- Quote from: Marco on August 27, 2022, 02:15:29 pm ---Welding up a corten steel enclosure and putting some insulation on the inside plus some automatic fans/heaters is cheap if your time is free. For a hobbyist with a large property, DIY'ing it doesn't seem risky to me.

--- End quote ---
Steel enclosure with flammable content = big bomb  Remember that a battery doesn't need oxigen to release it's energy. Grid storage batteries are specifically designed to spit the flames out of the top instead of to the sides.
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