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Old 09-24-2019, 09:12 PM   #1
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Valence u27 -12xp lithium for solar?

I have an option to get some used valence u27-12xp lithium batteries with 135amp hour capacity each for $375 a piece. They’ve been cycled about 330 times out of 4000. So about 80% new. Anyone know if these are a good choice to use in our airstream with solar? I can get more if anyone else was interested and lived near Rhode Island.
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Old 09-24-2019, 10:59 PM   #2
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hello, check out Will Prowse on youtube . he checked them out and they come in at 90% capacity. the big problem was they sell out fast. thinking of them for my trailer. good luck kurt
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Old 09-25-2019, 04:39 AM   #3
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Yeah I saw the video Will did on Valence lithium batteries which was very informative and that got me looking for them. I ended up finding a person nearby me who had about 32 of Valence u27’s. Not the smaller ones Will are talking about (40ah)in his videos but same brand but these are 138ah.
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Old 09-25-2019, 06:49 AM   #4
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I wouldn't hesitate to get those batteries and run them. I almost bought the 40ah batteries several times before Will made that video and now they are usually priced too for my liking. Still kicking myself...
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Old 09-30-2019, 10:12 PM   #5
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Did you ever end up getting the valence u27-12xp lithium batteries? I just purchased two to replace my interstate factory installed lead acids. Just wondering if I can use the charger that came in the airstream.
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Old 09-30-2019, 11:16 PM   #6
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Do they include the BMS? Do not charge a lithium battery without BMS, you also must make sure to use some caution before connecting in series or parallel, as any voltage/SOC differential could make for some exciting testing of your wiring.

You will need to find spec sheets for charging them and find a charger/converter that outputs that voltage.
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Old 09-30-2019, 11:40 PM   #7
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yes they do have their own bms.Will Prose hooked them up both in series and parallel and he had no problems. check out his vids on this battery. kurt
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Old 10-02-2019, 09:37 AM   #8
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Quote:
Originally Posted by logdigital View Post
Did you ever end up getting the valence u27-12xp lithium batteries? I just purchased two to replace my interstate factory installed lead acids. Just wondering if I can use the charger that came in the airstream.
If I was charging them it would be with a lithium specific charger, either from solar or 120v but a specific Li charge profile.
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Old 10-02-2019, 11:12 PM   #9
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Thanks for the advice. I found the perfect replacement for the Parallax 555 50amp service I currently have. Itís the Progressive Dynamics PD4560LIK18LS8, which is made specifically for charging lithium. Amazing how inexpensive it was, and reading up on this forum, sounds like a relatively easy install.
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