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Old 11-17-2022, 08:36 PM   #21
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Originally Posted by nvs4602 View Post
Your CO /propane detector are connected directly to the battery. I a disconnect on my positive battery post and turn off my lifepo4 completely from there.

You want to discharge your battery to 12.8v for storage. Lifepo4 like to be stored at this voltage for longevity.
I have never read that where did you find that would you please share that info and where you found it?
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Old 11-17-2022, 09:18 PM   #22
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I have never read that where did you find that would you please share that info and where you found it?
Battleborn states "charge to 100% and disconnect for storage" (complete disconnect of course).

They then recommend a complete charge twice per year.

But what do they know about LiFePo4 batteries --- right?

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Old 11-19-2022, 03:01 PM   #23
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I don't think anyone mentioned this, but your voltage is at 13.3-13.6 because you are on shore power and the converter is charging and maintaining the batteries at that level. Therefore you don't have to worry about your batteries discharging while on shore power.

I don't see the difference between 13.3 and 13.6 as being material to anything, as your batteries are in maintain mode and not discharge mode.

When you put it away for storage then you would disconnect the battery as others have suggested, either by pulling the negative terminal or by installing a knife-type switch on the negative terminal and making sure that ALL negative wires to system loads go through that switch and NONE bypass it either at that terminal or through the second battery negative terminal if you have one. You have to d/c ALL negative connections for the disconnect to work.
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Old 11-22-2022, 06:12 PM   #24
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Job done

I found the on/off switch for the TV amp and turned it off. I have installed a switch in the panel (had a blank spot) for the radio and now switch off both the radio and memory power lines. With those two items I now have the parasitic drain down as far as I'm going to get it.


This is not for storage. When put the TT away I charge the batteries and then throw the disconnect switch. It is for boondocking -- don't want to waste a single electron (yeah I know this is a little anal).



Thanks for all the help and suggestions here.
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Old 11-22-2022, 07:46 PM   #25
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I don't think anyone mentioned this, but your voltage is at 13.3-13.6 because you are on shore power and the converter is charging and maintaining the batteries at that level. Therefore you don't have to worry about your batteries discharging while on shore power.
The higher voltage is due to having lithium battery.

Post #1
LiFePO4 batteries were at 13.6 volts after charging. Next day 13.3.
------------------------------------------------------------------
Now I would not get too focused on using voltage as a guide for state of charge (SOC)
Lifepo4 have a very flat charging curve
13.3 is still a very high state of charge.

Best thing to focus on ... how much power a day do you use
Do you have enough battery power to last you for a few days


are you able to replace that power + a bit more during the day
via the charging methods available to you at the present time.


If solar is the only charge source...
allow extra battery capacity your battery should hold about 3 days
OR add more panels

Solar is a good charge source as long as the sun is shining.. you are adding those sneaky electrons back.

Your solar charging setting should be set so as soon as charge is removed it is topped back up ... don't drain your battery to 20% and then hope you have enough charging time to get it back to 90-100%

You can add another lifepo4 to your bank at any time ... you don't have to worry about the matching criteria associated with lead acid .


Cost of a bit bigger battery bank sure beats the heck out of electron watching
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Old 11-23-2022, 01:19 PM   #26
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Battleborn states "charge to 100% and disconnect for storage" (complete disconnect of course).

They then recommend a complete charge twice per year.

But what do they know about LiFePo4 batteries --- right?

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That's what I knew but was 100% charge. I was wondering if I had missed the 12.8 somewhere. He didn't reply back so maybe he was talking about something else.
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Old 11-23-2022, 03:54 PM   #27
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Originally Posted by doanshop View Post
I have never read that where did you find that would you please share that info and where you found it?
There have been many discussions on this. Here is one.

https://endless-sphere.com/forums/viewtopic.php?t=40758

Lifepo4 cells are also stored and shipped at ~3.2v by the manufacturer.
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Old 11-23-2022, 07:14 PM   #28
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There have been many discussions on this. Here is one.

https://endless-sphere.com/forums/viewtopic.php?t=40758

Lifepo4 cells are also stored and shipped at ~3.2v by the manufacturer.
I stand by my comment 12.8 - 12.6 is 50% for FLA. 13 .1 - 13.2 is 50% for lifepo4 batteries. You must be talking about something else. Shipped below 50% is a DOT regulation for shipping. I stand with TitanMike and listen to the battery manufacturer and what they say. Good luck discharging your batteries to 12.8 and storing.

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Old 11-23-2022, 07:18 PM   #29
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shipping

https://www.iata.org/en/publications...ium-batteries/
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Old 11-23-2022, 07:27 PM   #30
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Originally Posted by doanshop View Post
I stand by my comment 12.8 - 12.6 is 50% for FLA. 13 .1 - 13.2 is 50% for lifepo4 batteries. You must be talking about something else. Shipped below 50% is a DOT regulation for shipping. I stand with TitanMike and listen to the battery manufacturer and what they say. Good luck discharging your batteries to 12.8 and storing.



Attachment 281794
To add for those that want to store their LiFePo4 batteries at a low SOC, be very careful. Even LiFePo4 batteries have a self discharge and if not careful they can discharge below the LVD (low voltage disconnect) threshold in the BMS.

If that happens a "doomsday clock" is triggered and unless the battery is recharged soon (Battleborn says 5 days for theirs) one now owns an expensive wheel chock.

This can be a major problem for those with a small battery bank and leave their RV stored for a long time. Once SOC reaches 0% one better be there to start the charging.

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Old 11-23-2022, 09:41 PM   #31
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Originally Posted by doanshop View Post
I stand by my comment 12.8 - 12.6 is 50% for FLA. 13 .1 - 13.2 is 50% for lifepo4 batteries. You must be talking about something else. Shipped below 50% is a DOT regulation for shipping. I stand with TitanMike and listen to the battery manufacturer and what they say. Good luck discharging your batteries to 12.8 and storing.

Attachment 281794
I've watched countless videos and read as many forums on lifepo4 batteries before I built mine. Now I'm not saying I'm all knowing, but I do know a fair bit. I know off-grid garage on YouTube has discussed this very topic. But I haven't found the exact one. He has worked with cell level manufacturers that supply cells used by USA battery manufacturers.

Here's one of his videos on float voltage for lifepo4 batteries. I also took a screen shot of one of the questions about storage of lifepo4 batteries.

https://youtu.be/6vTaCkTVl7I

I asked him for a specific voltage for 50 to 60%. I'll see if he replies.
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Old 11-24-2022, 05:56 PM   #32
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Off grid garage from YouTube got back to me. Here is his response. So I stand corrected on using voltage for picking percentage of charge.
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Old 12-04-2022, 04:37 PM   #33
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Off grid garage from YouTube got back to me. Here is his response. So I stand corrected on using voltage for picking percentage of charge.

From that opinion, in home storage LIPO batteries/solar generator should be stored at 60% between ice storms or outages? That would make the available energy similar to lead acid, if lead acid are only making ½ of lithium and lithium was not discharged to zero.
Hard to know when you are going to need backup.
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Old 12-04-2022, 09:43 PM   #34
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From that opinion, in home storage LIPO batteries/solar generator should be stored at 60% between ice storms or outages? That would make the available energy similar to lead acid, if lead acid are only making ½ of lithium and lithium was not discharged to zero.
Hard to know when you are going to need backup.
Does boggle the mind, doesn't it.

All these theories that will at best yield a small number of cycles in battery life which one might enjoy 15-20 years from now.

Remember, LiFePo4 batteries aren't really considered at end of life until they reach 80% of original capacity and even then they have more usable capacity than a similarly sized Lead/Acid battery.

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