31–40 of 65 posts
Earlier quoted context omitted.
If you don't have a bottom layer the sand will immediately fall
Actually thinking about it - why not have everything encased in sand all the time, you'd just have to be a kid playing in a sandbox when doing maintenance
And dangerous for any moving parts?
Earlier quoted context omitted.
> place a giant bucket of dry sand above the pack, with the bottom layer being made of acrylic or other plastic that melts. Honest question: is this a real hack that people do in these situations or did you just come up with it?
It's a hack I started doing after a friend's home almost burned down from a vape battery gone bad. In any case, dry sand is one of the methods firefighters use to put out battery fires, the other being dumping it in a giant vat of water (that's what's done for electric cars) or class D fire extinguishers which are extremely fine powdered salt.
Please only use properly designed and tested fire suppression systems, as hack jobs might not help at all and do harm from the false sense of security leading to lack of actually effective mitigations.
Earlier quoted context omitted.
> with the bottom layer being made of acrylic or other plastic that melts. Why is this bottom layer important?
If the batteries catch fire the acrylic bottom will melt and automatically dump the sand onto the fire. This is a questionable setup though. You'd need massive amounts of sand dumped evenly, which requires more design and verification. Acrylic is also itself flammable. A basic water based fire suppressor would not extinguish a battery fire but it will cool it and the room, limiting spread. Let the experts design this…
Earlier quoted context omitted.
Jesus. No cell balancing, protection or monitoring that I can see, and most importantly - wires directly soldered onto the battery instead of spot-welded. That's a fire hazard waiting to happen. People, if y'all ever build your own battery pack, please think about safety. Or if you don't, place a giant bucket of dry sand above the pack, with the bottom layer being made of acrylic or other plastic that melts. That's a…
He did and end run around saftey, and just put the whole system in a shed, which in any real emergency situation , dramaticaly reduces risk to life and property. Also each battery bank is.air gapped , which will significantly reduce any fire from spreading to adjacent banks. The system looks well made, and has 8 years up time. I live off grid and am useing lead acid batteries, but would like to switch to sodium.
There is no fire safety there. Let's just hope the shed is very far from a house, fences, trees, bushes, or anything else that could catch fire and close any "air gaps" and cause harm.
Earlier quoted context omitted.
Jesus. No cell balancing, protection or monitoring that I can see, and most importantly - wires directly soldered onto the battery instead of spot-welded. That's a fire hazard waiting to happen. People, if y'all ever build your own battery pack, please think about safety. Or if you don't, place a giant bucket of dry sand above the pack, with the bottom layer being made of acrylic or other plastic that melts. That's a…
He did and end run around saftey, and just put the whole system in a shed, which in any real emergency situation , dramaticaly reduces risk to life and property. Also each battery bank is.air gapped , which will significantly reduce any fire from spreading to adjacent banks. The system looks well made, and has 8 years up time. I live off grid and am useing lead acid batteries, but would like to switch to sodium.
https://secondlifestorage.com/index.php?threads/glubuxs-powe...
I've been thinking about similar setups with lots of batteries as I have excess energy I can generate during the day and a lot of otherwise barely usable space in my attic. Fire hazard is my major concern. How do you make sure old (or even new) batteries don't do their usual thing, especially if they are in an environment with unstable temperatures and scarce monitoring?
External monitoring is made by Victron, who initially did electrical solutions for boats. Their inverters are also very popular and pretty great.
Also, brick walls are kinda nice I have to admit, along with an exhaust for any fumes.
Earlier quoted context omitted.
> place a giant bucket of dry sand above the pack, with the bottom layer being made of acrylic or other plastic that melts. Honest question: is this a real hack that people do in these situations or did you just come up with it?
It's a hack I started doing after a friend's home almost burned down from a vape battery gone bad. In any case, dry sand is one of the methods firefighters use to put out battery fires, the other being dumping it in a giant vat of water (that's what's done for electric cars) or class D fire extinguishers which are extremely fine powdered salt.
I've been thinking about similar setups with lots of batteries as I have excess energy I can generate during the day and a lot of otherwise barely usable space in my attic. Fire hazard is my major concern. How do you make sure old (or even new) batteries don't do their usual thing, especially if they are in an environment with unstable temperatures and scarce monitoring?
Their solutions need to comply to safety standards.
Earlier quoted context omitted.
> with the bottom layer being made of acrylic or other plastic that melts. Why is this bottom layer important?
If the batteries catch fire the acrylic bottom will melt and automatically dump the sand onto the fire. This is a questionable setup though. You'd need massive amounts of sand dumped evenly, which requires more design and verification. Acrylic is also itself flammable. A basic water based fire suppressor would not extinguish a battery fire but it will cool it and the room, limiting spread. Let the experts design this…
That's the thing: it will not, quite the contrary - unless it's many tons of water at once that quench the fire, the burning lithium will just go and create hydrogen gas that in turn recombines and leads to an even larger fire.