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Open Roads Forum  >  Tech Issues

 > Not the cells that fail it is the battery Management System!

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TechWriter

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Posted: 04/09/22 06:59pm Link  |  Print  |  Notify Moderator

wa8yxm wrote:

TecWriter said:"Get on youtube and you will see the extra ordinary measures needed to destroy an LFP cell."

I see many things on You Tube that are ...... Well...... Entainertaining yes. Factual no.

Um, that was time2roll, w8forit, not me.

The YouTube link I gave was to someone who seems to know what he’s talking about. That’s why I’m pretty sure you didn’t check it out.


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TechWriter

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Posted: 04/09/22 07:02pm Link  |  Print  |  Notify Moderator

S Davis wrote:


I have four lightly used Trojan T-105s I can’t find a home for.

Now you tell me.

pianotuna

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Posted: 04/09/22 09:49pm Link  |  Print  |  Notify Moderator

S Davis wrote:

The thing I like is they will take every amp I throw at them until fully charged unlike other chemistries that charge slower at the top


Except that 100% state of charge is NOT a goal for li.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

Itinerant1

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Posted: 04/09/22 10:08pm Link  |  Print  |  Notify Moderator

pianotuna wrote:

S Davis wrote:

The thing I like is they will take every amp I throw at them until fully charged unlike other chemistries that charge slower at the top


Except that 100% state of charge is NOT a goal for li.


What charge voltage do you recommend? What are you calling 100% charge...voltage? Is that 100% and using it? 100% then resting it? Oh so many more questions I could think of as a daily user and charging to 14.1v almost everyday when the sun permits it, am I killing the batteries or shortening their life? Should we be using batteries for longevity or daily loads?


12v 500ah, 20 cells_ 4s5p (GBS LFMP battery system). 8 CTI 160 watt panels (1,280 watts)2s4p,Panels mounted flat. Magnum PT100 SCC, Magnum 3012 hybrid inverter, ME-ARC 50. Installed 4/2016 been on 24/7/365, daily 35-45% DOD 2,100+ partial cycles.

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Posted: 04/10/22 12:24am Link  |  Print  |  Notify Moderator

pianotuna wrote:

S Davis wrote:

The thing I like is they will take every amp I throw at them until fully charged unlike other chemistries that charge slower at the top


Except that 100% state of charge is NOT a goal for li.


I didn’t say 100% state of charge, i said fully charged. Maybe I consider mine fully charged at 90%.

3 tons

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Posted: 04/10/22 09:00am Link  |  Print  |  Notify Moderator

pianotuna wrote:

S Davis wrote:

The thing I like is they will take every amp I throw at them until fully charged unlike other chemistries that charge slower at the top


Except that 100% state of charge is NOT a goal for li.


As I previously stated, ‘Discernment Required’ - gotta separate the chafe from the wheat…

3 tons

pianotuna

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Posted: 04/10/22 12:40pm Link  |  Print  |  Notify Moderator

S Davis wrote:

pianotuna wrote:

S Davis wrote:

The thing I like is they will take every amp I throw at them until fully charged unlike other chemistries that charge slower at the top


Except that 100% state of charge is NOT a goal for li.


I didn’t say 100% state of charge, i said fully charged. Maybe I consider mine fully charged at 90%.


You may wish to consider 85% instead of 90% if you want maximum cycles.

It doesn't matter to me as Li are not in my temperature zone.

S Davis

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Posted: 04/10/22 01:43pm Link  |  Print  |  Notify Moderator

pianotuna wrote:

S Davis wrote:

pianotuna wrote:

S Davis wrote:

The thing I like is they will take every amp I throw at them until fully charged unlike other chemistries that charge slower at the top


Except that 100% state of charge is NOT a goal for li.


I didn’t say 100% state of charge, i said fully charged. Maybe I consider mine fully charged at 90%.


You may wish to consider 85% instead of 90% if you want maximum cycles.

It doesn't matter to me as Li are not in my temperature zone.


The manufacturer specs are 10% to 90% SOC for 3500 cycles, that is in a compression fixture.

3 tons

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Posted: 04/10/22 01:59pm Link  |  Print  |  Notify Moderator

pianotuna wrote:

S Davis wrote:

pianotuna wrote:

S Davis wrote:

The thing I like is they will take every amp I throw at them until fully charged unlike other chemistries that charge slower at the top


Except that 100% state of charge is NOT a goal for li.


I didn’t say 100% state of charge, i said fully charged. Maybe I consider mine fully charged at 90%.


You may wish to consider 85% instead of 90% if you want maximum cycles.

It doesn't matter to me as Li are not in my temperature zone.


Well, here’s where actual user application and seasoned experience kinda, sorta matters - For instance, IF 85% is better than 90, then should we also assume that 80% is better than 85, and so on …(ad nauseam…)…One would like to think that this point is rather self evident, but from my perspective, what’s being ‘implied’ per caveat (while avoiding the explicit) is that a LFP ought not be fully charged (do so at your own RISK!!), and this is in fact patently False…But haven’t we seen this tactic elsewhere before?? (I’m starting to wonder, was this the design behind this thread??) - sadly, seasoned LFP posters have witnessed this pattern here before!)…And this is precisely how mythologies get launched (and re-launched!), to grow ‘plausable’ legs…

So say of the 3,000 to 5,000 cycles LFP’s are ostensibly capable of delivering (say with competent charging), does anyone worry about how many cycles will be lost by charging to a what I’d call a mere 90% versus 85?….Really??

This is where a few ‘determined’ FLA folks, unable to wrap their minds around LFP, inoculate themselves from empirical reality…

3 tons

pianotuna

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Posted: 04/10/22 08:36pm Link  |  Print  |  Notify Moderator

Hi 3tons,

I do have an li battery device. They happen to recommend 85% maximum charge to extend the life of the battery.

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