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Open Roads Forum  >  Tech Issues

 > LFP/LiFePO battery asleep?

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wa8yxm

Davison Michigan (East of Flint)

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Posted: 08/26/22 04:30pm Link  |  Quote  |  Print  |  Notify Moderator

In addition to the external charger LI batteries have some kind of electronics inside the case that is supposed to protect and balance the cells. (Like equalization but it's done differently) You may have lost a cell and the BMS (Battery Monitoring System) is refusing a charge to protect from "FLAME ON"

Just a guess..

I recently read a post by an expert who takes these batteries. opens them up and often as not finds the BMS has failed (or one cell) he has a source of replacement electronics so he gets basically Free Batteries.

Alas I did not save a link.


Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times


shelbyfv

TN

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Posted: 08/26/22 04:33pm Link  |  Quote  |  Print  |  Notify Moderator

The person at Renogy who has been responding to my emails seems to work night shift. Maybe I'll know more tomorrow, unless they are already off for the weekend. I really liked the battery. Twice the capacity of the old one and so much lighter. Easy to maneuver in and out of the battery cave.

2oldman

NM

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Posted: 08/26/22 04:59pm Link  |  Quote  |  Print  |  Notify Moderator

shelbyfv wrote:

I really liked the battery. Twice the capacity of the old one and so much lighter.
And no water or corrosion. They are nice.. but can be finicky!

pianotuna

Regina, SK, Canada

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Posted: 08/26/22 05:51pm Link  |  Quote  |  Print  |  Notify Moderator

Shelbyfv,

I hope this works out for you.


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.

Flapper

Minnesota

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Posted: 08/26/22 08:18pm Link  |  Quote  |  Print  |  Notify Moderator

I'm with the "failed BMS" suggestions. Such a low level of discharge permanently damages the battery, with no recovery possible. BUT, a reputable company (such as Renogy) should have a low voltage safety built in to the BMS - preventing over discharge. So no matter which issue - failed BMS or over drawn cells, it should be a warranty item for them to replace....


2012 F150 Eco, 4x4, SCrew, Max Tow, HD Payload
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3 tons

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Posted: 08/27/22 06:39pm Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

Yes. Load disconnect does work on some. After disconnect period go direct to charging.

May charge at very low current until the voltage comes up. The BT app should work if the BMS wakes up.


X2, disconnect, wait 15 seconds, then re-connect and try a charge..

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shelbyfv

TN

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Posted: 08/29/22 01:19pm Link  |  Quote  |  Print  |  Notify Moderator

Update- Email today from Renogy asking me to try something I've already tried, connecting to a Li specific charger with activation feature. Hopefully just a miscommunication and not foot dragging. Guess we'll see what tomorrow's email brings. Reinforces my opinion that it's better to buy through Amazon if that's an option. No hassle returns....

3 tons

NV.

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Posted: 08/29/22 10:05pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the kindly update [emoticon] It would be great to know what the issue here is!

3 tons

shelbyfv

TN

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Posted: 08/30/22 05:42am Link  |  Quote  |  Print  |  Notify Moderator

Today they say they will arrange to pick up the battery and test it. Replace it if found to be defective. Hopefully they will let me know what the issue is, we'll see. I'll update, though I figure it may take awhile.

shelbyfv

TN

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Posted: 09/07/22 05:23pm Link  |  Quote  |  Print  |  Notify Moderator

FedEx picked it up today, will be returned to Renogy for postmortem.

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