MJCM Posted January 10, 2022 Share Posted January 10, 2022 1 1 Link to comment Share on other sites More sharing options...
MJCM Posted January 10, 2022 Author Share Posted January 10, 2022 Another interesting video from this Channel Link to comment Share on other sites More sharing options...
Popular Post Crossy Posted January 10, 2022 Popular Post Share Posted January 10, 2022 I did actually consider going for a bunch of 32650 LiFePO4 cells in a 48V pack but ended up with used 200Ah LiFePO4 golf cart cells (which measure at about 180Ah). The cost of the used cells was comparable to cheap 32650s but by the time you factored in assembling the beast (and my need for instant gratification) the cart cells won, this time at least. Maybe for my next storage expansion ... EDIT At current prices for 6,000mAh 32650s I could DIY a 300Ah x 48V pack for about 45k Baht. That would be 800 cells in a 50P-16S pack. 3 Link to comment Share on other sites More sharing options...
OneMoreFarang Posted January 10, 2022 Share Posted January 10, 2022 I hope you are all prepared for a Lithium fire. If one of those cells fails in the wrong way all those cells will be on fire. And then there is nothin you can do about that fire. Just wait until it's over and hopefully it didn't damage too much nearby. 1 Link to comment Share on other sites More sharing options...
Crossy Posted January 10, 2022 Share Posted January 10, 2022 Yup ^^^ if you watch the later videos in the Big Battery series you can see what he needed to do to meet Aussie regulations. That's my reason for going LiFePO4, less dense than Li-ion but much less likely to go thermal-runaway. Our current LiFePO4 batteries are well away from the house in a fire-resistant box. 1 1 Link to comment Share on other sites More sharing options...
MJCM Posted January 10, 2022 Author Share Posted January 10, 2022 (edited) 2 hours ago, OneMoreFarang said: I hope you are all prepared for a Lithium fire. If one of those cells fails in the wrong way all those cells will be on fire. And then there is nothin you can do about that fire. Just wait until it's over and hopefully it didn't damage too much nearby. There is always a risk with Batteries, even with the ones in your phone and you connect a dodgy charger to it (Or remember the issue with the Samsung Galaxy Note 7 anyone????) 1 hour ago, Crossy said: Our current LiFePO4 batteries are well away from the house in a fire-resistant box. Ours will be in a storage area with over 50k liters of water. But I have been told when there is fire, it's important NOT to FLOOD them but just contain the fire! Correct?? Edited January 10, 2022 by MJCM Link to comment Share on other sites More sharing options...
007 RED Posted January 10, 2022 Share Posted January 10, 2022 2 hours ago, OneMoreFarang said: I hope you are all prepared for a Lithium fire. If one of those cells fails in the wrong way all those cells will be on fire. And then there is nothin you can do about that fire. Just wait until it's over and hopefully it didn't damage too much nearby. Try this one for size, NY Bronx, Saturday. Frightening! https://www.firehouse.com/operations-training/news/21252461/lithiumion-battery-sparks-4alarm-bronx-fire 1 Link to comment Share on other sites More sharing options...
OneMoreFarang Posted January 10, 2022 Share Posted January 10, 2022 1 hour ago, MJCM said: There is always a risk with Batteries, even with the ones in your phone and you connect a dodgy charger to it (Or remember the issue with the Samsung Galaxy Note 7 anyone????) Ours will be in a storage area with over 50k liters of water. But I have been told when there is fire, it's important NOT to FLOOD them but just contain the fire! Correct?? Please don't tell me that you play with Lithium batteries and are not aware of the fact that mixing them with water is a very bad idea. Link to comment Share on other sites More sharing options...
MJCM Posted January 10, 2022 Author Share Posted January 10, 2022 (edited) 3 hours ago, OneMoreFarang said: Please don't tell me that you play with Lithium batteries and are not aware of the fact that mixing them with water is a very bad idea. I am not doing anything yet. It was just a simple question so please do elaborate. Edited January 10, 2022 by MJCM Link to comment Share on other sites More sharing options...
OneMoreFarang Posted January 10, 2022 Share Posted January 10, 2022 1 hour ago, MJCM said: I am not doing anything yet. It was just a simple question so please do elaborate. 1 Link to comment Share on other sites More sharing options...
MJCM Posted January 11, 2022 Author Share Posted January 11, 2022 8 hours ago, OneMoreFarang said: Oke thanks, but then a follow-up question. How do you then stop a lithium battery fire? Link to comment Share on other sites More sharing options...
Muhendis Posted January 11, 2022 Share Posted January 11, 2022 1 hour ago, MJCM said: How do you then stop a lithium battery fire? A lithium battery fire is a chemical reaction causing heat. Once this reaction has started it becomes self perpetuating until all the reactive agents are used up. Best way to prevent a lithium battery fire is to carefully maintain charge and discharge within the parameters specified by the manufacturer and keep the battery in an unhot environment. Best is to use LiFePO4 chemistry which is much more stable. 1 1 Link to comment Share on other sites More sharing options...
MJCM Posted January 11, 2022 Author Share Posted January 11, 2022 17 minutes ago, Muhendis said: A lithium battery fire is a chemical reaction causing heat. Once this reaction has started it becomes self perpetuating until all the reactive agents are used up. Best way to prevent a lithium battery fire is to carefully maintain charge and discharge within the parameters specified by the manufacturer and keep the battery in an unhot environment. Best is to use LiFePO4 chemistry which is much more stable. Oooh thanks, very interesting this. But May I ask, why, if LifePo4 batteries are that more stable/safe, why aren't they in our Phones?? $$$$$ ??? Link to comment Share on other sites More sharing options...
OneMoreFarang Posted January 11, 2022 Share Posted January 11, 2022 2 minutes ago, MJCM said: Oooh thanks, very interesting this. But May I ask, why, if LifePo4 batteries are that more stable/safe, why aren't they in our Phones?? $$$$$ ??? Different Lithium batteries have different properties. I.e. some can be charged fast and can produce lots of output current. Others are designed to produce low current output over a long period of time. Some are dangerous and some are very dangerous. And, as far as I know, there is no way to stop a Lithium fire. It seems there is only one option: wait until it is over and if possible move the burning batteries away from anything that can burn or the other way around. Here is another example from a fire from a bicycle with Lithium battery. The guy who made the video is an electronic specialist... Link to comment Share on other sites More sharing options...
Muhendis Posted January 11, 2022 Share Posted January 11, 2022 1 minute ago, MJCM said: if LifePo4 batteries are that more stable/safe, why aren't they in our Phones? A LiFePO4 cell has less capacity than a lithium cell. It is a good selling point to have your 'phone work for longer between charges. Tesla cars used Lithium cells to give maximum range. I read that they are being phased out in favour of LiFePO4's. They are still able to get the same range. That's because the capacity is maintained by changing the shape from loads of cylindrical cells to bigger prismatic units. So no gaps between cells. 1 1 Link to comment Share on other sites More sharing options...
MJCM Posted January 11, 2022 Author Share Posted January 11, 2022 (edited) Can anyone tell me if this is a Lithium or a LifePo4 battery? The Cycles (80% DOD) seems IMHO (but who am I ???? ) good. Can't find much info on it online except for this PDF LVSUN 200 AH LITHIUM 48 V 2.pdf Edited January 11, 2022 by MJCM Link to comment Share on other sites More sharing options...
Crossy Posted January 11, 2022 Share Posted January 11, 2022 1 hour ago, MJCM said: Can anyone tell me if this is a Lithium or a LifePo4 battery? It's wired 16S4P ("Combination") which would make it LiFePO4, if it was Li-ion it would be 14S (Li-ion cells are higher voltage, 3.7V vs 3.2V for LiFePO4). 1 1 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now