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diy solar

House burned down

Many acoustic ceiling tiles as you would find in an office are mineral board. And I believe “fire proof.” Easy to cut, very light, very cheap, not conductive. Easy to put in, over, and around batteries etc.

I can’t seem to find a direct comparison to sheet rock (gypsum board). But I suspect they compare very favorably.
 
Bluedog225 said:
Many acoustic ceiling tiles as you would find in an office are mineral board. And I believe “fire proof.” Easy to cut, very light, very cheap, not conductive. Easy to put in, over, and around batteries etc.

I can’t seem to find a direct comparison to sheet rock (gypsum board). But I suspect they compare very favorably.
Click to expand...
That's precisely what I lined the sides, bottom, and top of my battery shelf with (rock wool). Which was easiest to find in the USA at least at an acoustic tile store: https://www.acoustimac.com/acoustic...c-insulation/mineral-wool-acoustic-insulation
 
Must be 16s.

I guess I'll have to look onto Alibaba for some of these? I've avoided it thus far...
 
SparkyJJO said:
Must be 16s.

I guess I'll have to look onto Alibaba for some of these? I've avoided it thus far...
Click to expand...
You can get all the ones I mentioned direct to consumer from their website (maybe not luyuan, idk)
 
G00SE said:
You can get all the ones I mentioned direct to consumer from their website (maybe not luyuan, idk)
Click to expand...
I just found on Luyuan's site. They're all for 280-304Ah cells. Hm.

Edit - maybe I just need to ask. Seems they can be customized.
 
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Brucey said:
The breaker can fulfill the over current and disconnect functions. Class t and switch per battery being the alternative.
Click to expand...
Breakers are handy for isolating components and general protection of your devices. They have a place and fulfill a need. The class-t fuse as close as possible to the battery, is the last resort oh $hit safety release to prevent electrons from being directed in undesirable directions.
 
rhino said:
That's precisely what I lined the sides, bottom, and top of my battery shelf with (rock wool). Which was easiest to find in the USA at least at an acoustic tile store: https://www.acoustimac.com/acoustic...c-insulation/mineral-wool-acoustic-insulation
Click to expand...


You can order cases of rock wool insulation thick like the pink fiberglass from home depot. The rigid ceiling tile boards won't burn but will pass some amount of heat. The low density stuff (2 in thick)you can hold a MAPP gas torch on and it doesn't smoke, glow, or catch fire.

I tested it when I was building an enclosure for the 3d printer. I needed constant temperature that I could vent to the outside printing certain filaments.
 
Hedges said:
How the fire re-ignited after being extinguished, I don't know.
Click to expand...
A case to case short inside one of the batteries would blow that batteries fuse as the rest fed into it, and it would continue shifting afterwards potentially re igniting its own vent gases.
 
Some high-end home energy storage systems incorporate Aerosol Fire Extinguishing devices. These are fire suppression systems that release aerosolized particles containing potassium ions and other radicals to inhibit the combustion chain reaction.

Although I have never seen these sold to general consumers in Japan where I live, I found similar fire extinguishing devices on Aliexpress.

Based on the model number, the manufacturer is likely JiAnDun (及安盾).

热气溶胶-产品中心-湖北及安盾消防科技有限公司|不辜负每一次托付

热气溶胶 湖北及安盾消防科技有限公司|不辜负每一次托付
www.jad119.com www.jad119.com
According to the product page, the main ingredients appear to be potassium nitrate and strontium nitrate. I believe the heat from a fire causes these to burn rapidly inside the device, generating the aerosol.

The product allegedly complies with the Chinese national standard GB/T GA499.1-2010, and is widely sold on Chinese shopping sites like Taobao.

From my research, the company seems quite reputable, but its reliability is unknown. However, given the fire risk, it seems like an inexpensive investment, so I am considering purchasing one.
 
upnorthandpersonal said:
I think most here on the forum know I have been hammering on the use of Class T fuses since forever (and at times received push-back). I also talked to Victron (and other) reps at several occasions about using class T fuses (or at least similar, like BS88 etc), and did the same with BMS manufacturers when paralleling of batteries comes up. I'm glad to hear there are some signals appearing that vendors/etc. are finally addressing this.
Click to expand...

Yeah, class T seems to become more common. With a single battery bank, you might be good with a mega fuse, since the wires will limit the max short circuit current, but with the bigger installs these days thats not sufficient.

Victron recently introduced a class-T Lynx.

www.victronenergy.com

Lynx Class-T Power In - Victron Energy

The Lynx Class-T Power In connects and fuses up to two strings of Lithium batteries. It features a positive and negative busbar, and connections for two...
www.victronenergy.com www.victronenergy.com
 
HighTechLab said:
I am skeptical of the fuse being the initial cause, based on the fact that this happened at night with very low currents.

My though is, it could have been a cell that internally shorted, caught on fire and the fuse blew after the fire had already started melting things, one thing falls on top of another, etc.

Everyone is running out, pointing fingers, and changing out their fuses...the thing I'd like to point out is that every devastating fire I've seen on this forum was using raw cells. Not a single one I can recall use pre-built batteries that were fully contained in metal boxes holding smaller quantities of cells within. I'd argue that the metal boxes are what slow down and often times smother out the fires - Seplos makes some and I think they just make sense if you insist on DIYing your batteries.
Click to expand...
First off sympathies to the family, glad everyone got out okay!

As a noob to the DIY and still in the process of setting up my first system, I'm glad these EG4 indoor batteries have integrated fire suppression, and I'm using the metal conduit boxes all around. As well as one of the ionizing type smoke detectors next to the setup along with a backup class C fire extinguisher.

Knowing the way insurance companies are these days - I hope they don't put you through too much hell.
 
upnorthandpersonal said:
The house in Germany that blew up wasn't.
Click to expand...
Yes, a faulty pre-made battery. Had pouch cells in 16S4P even though the product was supposed to be prismatic 16S.
diysolarforum.com

Wow, basen rack.mounts batteries destroy a home in germany

Could be natural gas was inside room and battery. Over-pressure was enough to blow out walls but not to disassemble the battery box. Ignition doesn't have to come from battery, and I wouldn't expect it to unless there was a relay. The cells got charred. Was there a subsequent fire? Were they...
diysolarforum.com diysolarforum.com
 
hwy17 said:
I believe both reported fires share a suspicion of a lack of separator.

I'm taking all three conclusions:

1. Class T Fuses
2. Cells in metal boxes
3. 5 side FR4 separation
Click to expand...

Yup, add me to the list.

I just got two of the Liyuan 280Ah 48V kits, great quality and not silly money.

I have 32 cells which will fit that are currently as a "naked" 2P16S arrangement (they do have separators). I'm going to order another pair of boxes for them. That would place all my cells in metal containment and then inside a steel and cement-board house.
 
I am still far from it, but i think i will go the battery box route like the battery gueen and basen ones. Metal enclosures, cell are upright etc...
 
Brucey said:
I think he was on cement board on metal shelves in his final configuration?
Click to expand...
The image of the fire in his first post does not show any cement board or metal shelf. Just the metal uprights. Not a complete picture and the fire does not seem to have reached the lowest part of the shelving but burned upwards. I realize that the OP is traumatized by his lost and does not wish to be criticized. I give him great credit for posting about it at all.

It would be great if independent investigation could be conducted into fires such as the last couple of large scale LiFePO4 fires reported on the Forum. Some lessons could than be taken from it.
 
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