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Open Roads Forum  >  Tech Issues

 > Effect of no absorption on LiFePo4?

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3 tons

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Posted: 01/23/23 12:32pm Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

Good lord… add this to Dedmiston’s list of things men will over analyze and pick to death!

You have LFP batteries. Make sure they are relatively or fully charged, make sure they’re disconnected or no draw and then don’t think about them until you need them again


Ha!! In actual practice so TRUE!!…Thanks for distilling this down it’s most Critical Basics!! [emoticon]

3 tons

tommyznr

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Posted: 01/25/23 07:15am Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

Good lord… add this to Dedmiston’s list of things men will over analyze and pick to death!

You have LFP batteries. Make sure they are relatively or fully charged, make sure they’re disconnected or no draw and then don’t think about them until you need them again


This needs to be a sticky on every LFP forum everywhere and also needs to be the first result for the Google.

I went down the rabbit hole two years ago and read so much conflicting information I had my undies in such a bundle that......... well you get the picture.

I now rest easy at night that my batteries will still be there in spring where I left them in fall.


Tom

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Grit dog

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Posted: 01/25/23 11:22am Link  |  Quote  |  Print  |  Notify Moderator

And we all gotta go through a little experience with something new before learning or knowing what to expect and how to deal with or maintain it.
My response above is for the RV power “experts” if you will, who can’t seem to not go down rabbit holes.


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Cptnvideo

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Posted: 01/25/23 02:48pm Link  |  Quote  |  Print  |  Notify Moderator

bdosborn wrote:

Some LiFePo4 batteries recommend an absorption stage, it gives the BMS cell balancer time to work. The voltage region that most BMS balancers work in is so high on the charge curve that actual balancing might only last a minute or two. Here's what Battleborn recommends:
https://battlebornbatteries.com/programm........-a-victron-smartsolar-charge-controller/
Bruce


Thanks for the BattleBorn link.
I have 5 206ah SOK batteries, (not sure what SOK recommends) but it would be nearly impossible for me to hold absorption for 10 hours (via solar charging) for my 1030 ah of batteries. What I do is set absorption to 14.2 volts for 20 minutes. I also set equalization to a schedule of once every 30 days at 14.4 volts.
Before anyone tells me I am shortening the life of my LFPs, the batteries are not quite one year old and I am 75 years old, so I think the batteries will outlast me no matter how I charge them.


Bill & Linda
Arizona
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3 tons

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Posted: 01/26/23 01:18pm Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

And we all gotta go through a little experience with something new before learning or knowing what to expect and how to deal with or maintain it.
My response above is for the RV power “experts” if you will, who can’t seem to not go down rabbit holes.


Kindly sensing your frustration, consider (in the interest of a somewhat wider info-seeking audience…) that one man’s rabbit hole might very well be another man’s ‘go to’…

Admittedly, I sometimes provide the ugly details, but mostly to help dampen the ‘recurring, made-up’ LFP mis-information from growing recurring legs (as has happened on LFP ad nauseam - a seasoned pattern of nuisance thread misdirects by interlopers) JMHO…

3 tons - Guilty as Charged

Itinerant1

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Posted: 01/27/23 06:40am Link  |  Quote  |  Print  |  Notify Moderator

3 tons wrote:

Grit dog wrote:

And we all gotta go through a little experience with something new before learning or knowing what to expect and how to deal with or maintain it.
My response above is for the RV power “experts” if you will, who can’t seem to not go down rabbit holes.


Kindly sensing your frustration, consider (in the interest of a somewhat wider info-seeking audience…) that one man’s rabbit hole might very well be another man’s ‘go to’…

Admittedly, I sometimes provide the ugly details, but mostly to help dampen the ‘recurring, made-up’ LFP mis-information from growing recurring legs (as has happened on LFP ad nauseam - a seasoned pattern of nuisance thread misdirects by interlopers) JMHO…

3 tons - Guilty as Charged


There have been many times in these LFP threads that I start to write a respone then delete it. You seem to handle the misinfo well that gets posted.

It just seems even with so much real life experience of almost 7 years living off of LFP/ solar and over 2,200+ partial cycles of 35-45% DOD equalling 175-225ah daily from a 500ah battery bank so many new folks or non user know more. More power to them. I'll stick to what's been working. [emoticon]


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 2,237+ partial cycles.

Grit dog

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Posted: 01/27/23 09:36am Link  |  Quote  |  Print  |  Notify Moderator

3 tons wrote:

Grit dog wrote:

And we all gotta go through a little experience with something new before learning or knowing what to expect and how to deal with or maintain it.
My response above is for the RV power “experts” if you will, who can’t seem to not go down rabbit holes.


Kindly sensing your frustration, consider (in the interest of a somewhat wider info-seeking audience…) that one man’s rabbit hole might very well be another man’s ‘go to’…

Admittedly, I sometimes provide the ugly details, but mostly to help dampen the ‘recurring, made-up’ LFP mis-information from growing recurring legs (as has happened on LFP ad nauseam - a seasoned pattern of nuisance thread misdirects by interlopers) JMHO…

3 tons - Guilty as Charged


I’m with ya. And knowledge is power.
But at some point it’s not just more good info with which to make a decision, but really just a try hard who can’t seem to stop at an appropriate level to answer the question in the context it was asked.

bdosborn

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Posted: 01/27/23 09:37am Link  |  Quote  |  Print  |  Notify Moderator

If I've posted something that isn't correct please feel free to correct it. I'd like to know if I'm spreading wrong information.


2010 6.5'X11' TTT - Boxcar
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Boxcar Build


3 tons

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Posted: 01/27/23 10:27am Link  |  Quote  |  Print  |  Notify Moderator

Iternate1 said, “There have been many times in these LFP threads that I start to write a response then delete it. You seem to handle the misinfo well that gets posted.”

Well, know you’re post have been invaluable so I hope you will continue to persevere, and by all means feel free to correct me where I stray - it’s much appreciated…I think we just continue to confront the few (established profiled) LFP mis-info merchants and their faux ‘plausible interest’ mischief - sadly, just part and parcel of an open forum…

Very Respectfully,

3 tons

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