Re: [AFMUG] LFP charging...

2024-05-07 Thread TJ Trout
100,000s of units sold to the diy community you are going to see some failures... wonder how many are self induced On Tue, May 7, 2024 at 12:07 PM Robert wrote: > I have 60KW of EG4s and am seeing more and more posts of failing BMSs on > them. They are showing up on the LFP auction sites for $5

Re: [AFMUG] LFP charging...

2024-05-07 Thread Robert
I wouldn't use a home made battery in a production site.   _Every_ LFP battery I look at has a bms.   They are getting almost cheaper to buy with a bms than you can source new cells for without unless you go to the auction sites... On 5/7/24 11:36 AM, Bill Prince wrote: LFP batteries need a sp

Re: [AFMUG] LFP charging...

2024-05-07 Thread Robert
I have 60KW of EG4s and am seeing more and more posts of failing BMSs on them.  They are showing up on the LFP auction sites for $500 with failed BMSs in higher and higher numbers.   Making me nervous of my rack reliability.. On 5/7/24 11:36 AM, TJ Trout wrote: they would work fine at that vol

Re: [AFMUG] LFP charging...

2024-05-07 Thread TJ Trout
they would work fine at that voltage, but not 100% charged which is a good thing. Regular power supplies cannot divert current like a DRS-480 for example, so if your system goes to 0% and dies, when AC power is restored the power supplies will need to charge the batteries and power your load at the

Re: [AFMUG] LFP charging...

2024-05-07 Thread Bill Prince
LFP batteries need a special charger unless they are equipped with a built-in BMS. Many, if not most 12V LFP batteries have a built-in BMS. bp On 5/7/2024 10:43 AM, Robert wrote: While I have used, read about, studied, and debated about LFP batteries, one thing I cannot find an answer to:

[AFMUG] LFP charging...

2024-05-07 Thread Robert
While I have used, read about, studied, and debated about LFP batteries, one thing I cannot find an answer to: Is there a problem with using a regular voltage supply set to 13.4 volts ( 90% ) charge to maintain a LFP battery for backup power use? Is there a need to buy a specialized battery