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-   -   Valence u27 -12xp lithium for solar? (https://www.airforums.com/forums/f448/valence-u27-12xp-lithium-for-solar-201232.html)

Mx468 09-24-2019 09:12 PM

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.

ke6gkv 09-24-2019 10:59 PM

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

Mx468 09-25-2019 04:39 AM

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.

CarterKraft 09-25-2019 06:49 AM

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...

logdigital 09-30-2019 10:12 PM

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.

SilverHouseDreams 09-30-2019 11:16 PM

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.

ke6gkv 09-30-2019 11:40 PM

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

CarterKraft 10-02-2019 09:37 AM

Quote:

Originally Posted by logdigital (Post 2294289)
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.

logdigital 10-02-2019 11:12 PM

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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