Valence u27 -12xp lithium for solar?

[Mx468]

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]

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]

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]

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]

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]

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]

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]

Originally Posted by logdigital

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]

Thanks for the advice. I found the perfect replacement for the Parallax 555 50amp service I currently have. It’s 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.