Pretty sure my wife is of the same mind with my projects. Little does she know I'm holding back.
Beware of Amazon's class t fuses
- Thread starter Osmethne
- Start date
Pretty sure my wife is of the same mind with my projects. Little does she know I'm holding back.
KITROBASKIN
Solar Addict
k490
Solar Enthusiast
This video test see how quickly they can catch fire, but the lack of producing oxygen like a LI battery doesn't get to 3000C. They can catch wood and other things on fire easily.
My thought is a box built to wood burning stove standards can contain a fire maybe even add a sprinkler system to it pump water into the box.
My thought is a box built to wood burning stove standards can contain a fire maybe even add a sprinkler system to it pump water into the box.
I've searched online and the only research paper that might hold an answer is behind a paywall.
From this chart it seems to be somewhere between 1200-1300 which should still melt steel.
Ampster
Renewable Energy Hobbyist
My preference would have been to grind off the end of the lug. That would still result in more surface contact than the washers and less resistance.
k490
Solar Enthusiast
Melting point of carbon steel is 1425-1540C I agree that it's not full proof lot better then just leaving them on a shelf inside an attached garage. I might even add a fire sprinkler to the box. The flame didn't look much different then what would see in a hot fire I have gotten wood burning stoves really hot they didn't melt.
I highly doubt that most battery boxes being sold are anything other than mild steel.
Edit: also thanks for the melting point list I got °c and °f mixed up for stainless seems it's not as good as I first thought
Zwy
Emperor Of Solar
A few thoughts, one, I don't pound nails into any battery.
Two, the cell was overcharged if LFP at 4.04V. It is possible it isn't LFP, I do not see any listing for a 75Ah cell on their website. Three, on their website there is a blog and this is one subject. https://wis-tek.com/blogs/blog/are-...est-lithium-ion-batteries-for-off-grid-living One has to ask the purpose of the video if it portrays LFP is dangerous unless purchased from their company?
Fifth, the test would be better if in a pack. It would show if a chain reaction occurred.
I would consider that video nothing but garbage and I'd never buy from that company.
I agree with the 5th the rest I had no idea I was just looking at the IR temp measurement that was useless (hi isn't a number) and then the colour of the flames.A few thoughts, one, I don't pound nails into any battery.
Two, the cell was overcharged if LFP at 4.04V. It is possible it isn't LFP, I do not see any listing for a 75Ah cell on their website. Three, on their website there is a blog and this is one subject. https://wis-tek.com/blogs/blog/are-...est-lithium-ion-batteries-for-off-grid-living One has to ask the purpose of the video if it portrays LFP is dangerous unless purchased from their company?
Fifth, the test would be better if in a pack. It would show if a chain reaction occurred.
I would consider that video nothing but garbage and I'd never buy from that company.
k490
Solar Enthusiast
There has been other videos showing venting of gas outside doesn't ignite the gas coming from lithium-iron does contain hydrogen gas. Here is firefighter discussing if LFP battery is safer then lithium ION he says they are not when they fail. BMS, circuit breakers, Class T-Fuses are not going to stop a single battery that has an internal short. Is the chances of a Lifep04 battery failing high IMO no look how many of them are running around inside RV's, homes, sheds, cars, and it's a very small % that fail in a way that starts a fire. I just want to have little extra insurance if it ever happens.A few thoughts, one, I don't pound nails into any battery.
Two, the cell was overcharged if LFP at 4.04V. It is possible it isn't LFP, I do not see any listing for a 75Ah cell on their website. Three, on their website there is a blog and this is one subject. https://wis-tek.com/blogs/blog/are-...est-lithium-ion-batteries-for-off-grid-living One has to ask the purpose of the video if it portrays LFP is dangerous unless purchased from their company?
Fifth, the test would be better if in a pack. It would show if a chain reaction occurred.
I would consider that video nothing but garbage and I'd never buy from that company.
Zwy
Emperor Of Solar
The cell in your first video if LFP was overcharged, that in itself is probable cause for the ignition and the hydrogen gas buildup. If not LFP, then it was certainly misleading as the chemistry is not listed.
I'm not wasting my time with the firefighter guy, he has a hard on for any lithium chemistry, most likely due to ignorance. Or he wants to have clickbait. Don't waste your time........
I'm not wasting my time with the firefighter guy, he has a hard on for any lithium chemistry, most likely due to ignorance. Or he wants to have clickbait. Don't waste your time........
robbob2112
Doing more research, mosty harmless
The just need to buy some self-sealing stem bolts to test with.
I hear Nog and Jake have cornered the market for them.
I hear Nog and Jake have cornered the market for them.
teal95
Solar Wizard
I believe Pennsylvania requires sprinklers in most structures, including all residences. I think that started being building code ~10 years ago.
Rexracer
New Member
I know this thread is a bit old, but after 8 pages I had to post some thoughts. Most washers are stamped, and have a noticeable crown. Makes for even worse contact.
Thoughts on battery boxes. Ceramic is the way to go. I would probably go with a steel box, maybe stainless. Most have to think about cost. I would then line it with brick, like used in a kiln or forge. I'm pretty sure this would do the best job containing a fire, but what do I know. I have no official training in this or anything else.
I would love to see testing on class t, anl and mrbf fuses. Name brand and popular off brand. I'm particularly interested in Bojack since they have a huge selection on Amazon.
robbob2112
Doing more research, mosty harmless
The only thing the washers had to do with this was incorrectly put between conducting point....i.e. between the fuse and the lug
Osmethne
Solar Enthusiast
I've stated this earlier. Maybe I should have edited the first post.
While washer order is important that's not the cause of this incident.
The cable that I used was from an old install with a bunch of crud on the battery form when the lead acids I had it on at the time started to leak.
Entirely my fault. The fuses were most likely fine.
Glamisduner
New Member
I had this happen to me with an ANL 80 amp fuse and 4awg wire. The holder melted right into the top of the battery it was taped to. I don't beleive I had any washers. Never figured out what caused it, but I bought a heavier duty fuse folder and went downt o a 60 amp fuse (because it should be enough in theory).
My one thought is that it could have been corrosion from non sealed lead acid batteries, but it was kinda hard to tell after the whole fuse holder melted. The lugs were still tightly sinched down though.
My one thought is that it could have been corrosion from non sealed lead acid batteries, but it was kinda hard to tell after the whole fuse holder melted. The lugs were still tightly sinched down though.
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