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Old 09-20-2019, 09:12 AM   #1
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used Valence LiFePo 4

I have 4, Valence U27-12XP 12 volt 138Ah batteries wired in parallel. They are used and I got the internal BMS talking to my computer yesterday. All 16 cells are within .006 volts of each other. Total charge of each module (4 cells) is 99.6%. It also shows total cycles of each module mine are 117,142,165, and 195. Not bad for a projected 3000 cycle life. Lots of info available that I haven't deciphered yet.

Crappy picture of one of the modules.

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Old 09-20-2019, 09:36 AM   #2
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Nice! If we ever go full-time, I'd be looking very closely at this. Right now my charger doesn't support Lithium, so it's more than just a simple battery swap. Awesome, though!

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Old 09-20-2019, 11:27 AM   #3
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The Valence system looks better than most.

The secondhand units seem to be sold with lots of lifespan still in them, test out at decent results

but are selling for 80%+ what I'd want to pay for brand new.

Personally I'm not buying secondhand cells for more than 25-30% of the new price, just too risky.
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Old 09-20-2019, 11:30 AM   #4
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Valence

Great to hear these stats. Where are these batteries manufactured? Is there any info on that?


Mike
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Old 09-20-2019, 12:18 PM   #5
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but are selling for 80%+ what I'd want to pay for brand new.
I paid less than 25%
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Old 09-20-2019, 12:26 PM   #6
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Great to hear these stats. Where are these batteries manufactured? Is there any info on that?


Mike
I think at least assembled in Europe? A123, Valence and Super B are now all part of Lithium Werks.

Dutch, but I believe all the factories are China of course.
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Old 02-10-2020, 02:25 PM   #7
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How did you establish BMS Communication?

Hello,

I am looking very closely to installing these same used Valence batteries but am getting confused on if the internal BMS will function stand alone. Can you offer any guidance on how you were able to establish the BMS communication and if without such communication are you still getting low/high voltage and temperature protection from the internal BMS without external connection or monitoring? Many Thanks!
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Old 02-10-2020, 03:51 PM   #8
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Link to manual and software as well as instructions on how to make the cable here. valencefiles

The internal BMS will handle cell balancing. It will not protect, I don't think but don't know for sure, against high/low voltage or temperature.

I have almost completed, should be less than two weeks, a system using overall bank temps and voltages to turn on heat, compartment fan and complete disconnect. It will also turn on/off the solar controller. It also has a data logger to log readings and also, I hope, log readings at the time any relay is triggered.

Hardware is done, I think, and since I'm really crappy at coding I have hired someone to do that for me based on what I think is needed.

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Old 02-10-2020, 05:05 PM   #9
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Thank you

Thanks for the info and link to the other site! Still need to find an answer to the temp and voltage cuttoffs working if the internal battery BMS is not connected to the aggregator/or PC.
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Old 07-30-2020, 06:18 PM   #10
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What size solar system are you going with? We are researching the same Battery. Any update?
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Old 07-30-2020, 08:11 PM   #11
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What size solar system are you going with? We are researching the same Battery. Any update?
System is pretty much done. 1500 watts of solar.
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