โFeb-14-2022 03:46 AM
โFeb-23-2022 04:46 AM
โFeb-21-2022 08:49 PM
lem55 wrote:
NOT a real costco website.
โFeb-20-2022 05:25 PM
โFeb-20-2022 04:02 PM
โFeb-17-2022 09:31 AM
โFeb-17-2022 08:57 AM
pianotuna wrote:I remember the learning curve when we built our lifepo4 pack. Assembling it was relatively easy. Fine-tuning, programming, calibrating the BMS much more difficult. One wrong setting has the potential to permanently damage all the cells.
BurbMan,
Write them and ask the parameters of the battery management system.
Here is a link to a pdf from them.
himaxelectronics.com/wp-content/uploads/2021/04/HiMASSi-Battery-Manual.pdf
โFeb-17-2022 08:10 AM
โFeb-17-2022 06:25 AM
BurbMan wrote:The weak point in most of the these budget lifepo4 batteries is the BMS. Both from a capability and reliability perspective. BMS's probably fail much more often than the cells themselves.
Thoughts on this battery?
โFeb-17-2022 05:54 AM
โFeb-17-2022 04:41 AM
otrfun wrote:pianotuna wrote:IMO, it's important to put both of these links into context.StirCrazy wrote:It is only more difficult. It can, and does happen.
LFP are not subject to thermal runaway like nicad and other chemistries.
https://onlinelibrary.wiley.com/doi/abs/10.1002/er.5298While it is unusual here is what may happen.
https://youtu.be/07BS6QY3wI8
All battery banks should be vented to the outside.
I believe the wiley.com link references a minor amount of thermal runaway (caused by overcharging) where damage is completely limited to the inside of the battery. The user may see the top "vent" rupture, but nothing more. I would surmise if a typical non-phosphate, lithium battery was subjected to the same overcharging, it would very likely explode and/or erupt in flames. Huge difference IMO.
I've seen this YT video before. To me this is akin to someone purposely puncturing a gas tank on a vehicle and having it explode or catch fire. It can happen, but . . .
Will Prowse at diysolarforum.com was the OP for a thread titled: "Can LiFePO4 Batteries Combust in Thermal Runaway Event?" One of his comments after someone posted a link to the above YT video: "The electrolyte is flammable. If a cell is physically damaged, you can catch it on fire. But for an exothermic reaction to occur to cause combustion, from the literature I've read, is impossible with lifepo4 . . . to have combustion caused internally, is impossible."
Lastly, I'm not aware of any external venting requirements for lifepo4. Do you have any supporting links that explain why this would be necessary? Thx.
โFeb-17-2022 03:04 AM
โFeb-16-2022 09:00 PM
pianotuna wrote:Ok, venting all batteries is your personal preference. No problem with that.
otrfun,
Murphy's Law.
I believe it is best practice for any and all battery banks to be vented. It may be best to plan for worst case. It's not an expensive thing to do.
For that matter, AGM batteries rather rarely vent.
โFeb-16-2022 07:54 PM
โFeb-16-2022 04:59 PM
pianotuna wrote:IMO, it's important to put both of these links into context.StirCrazy wrote:It is only more difficult. It can, and does happen.
LFP are not subject to thermal runaway like nicad and other chemistries.
https://onlinelibrary.wiley.com/doi/abs/10.1002/er.5298While it is unusual here is what may happen.
https://youtu.be/07BS6QY3wI8
All battery banks should be vented to the outside.