It's no longer 50 days, best is 90, most is 100+ because of a lack of dock workers on the west coast.Sent the money for 8 cells! Super happy I found you and didn’t have to wait 50 days
The N and K have different construction internally. I believe the spec sheets for both are available in the "Resources" section, and the spec sheets should illuminate the differences.Earlier a battery code was posted identifying these batteries as EVE model LF280K and it was said that was the latest version. I am being offered EVE LF280N. Under most circumstances a version "N" would be later than a "K", but not necessarily so. Could the difference be whether they are welded studs like these, or not?
Thanks Robert....without having looked, I am wondering if the distinction is something I would notice and understand. Seems the vendors I have talked to don't talk or care about battery versions.The N and K have different construction internally. I believe the spec sheets for both are available in the "Resources" section, and the spec sheets should illuminate the differences.
I believe the welded terminals are an optional feature for either cell, or they can be applied by a third party. I could be wrong though ?
I just compared the spec sheets, and in general, the LF280K and LF280N are very similar in most regards. The K model is a few millimeters taller, it's terminals are spaced further apart compared to the N's, and the K also has a slightly more stringent requirements for the rated charging and discharging temperature limits:Thanks Robert....without having looked, I am wondering if the distinction is something I would notice and understand. Seems the vendors I have talked to don't talk or care about battery versions.
Thanks very much. I appreciate the time you spent doing the comparison as I am thinking you caught differences I would have missed.I just compared the spec sheets, and in general, the LF280K and LF280N are very similar in most regards. The K model is a few millimeters taller, it's terminals are spaced further apart compared to the N's, and the K also has a slightly more stringent requirements for the rated charging and discharging temperature limits:
Charging Working Temperature for the K model is 0℃~55℃, compared to 0℃~60℃ for the N model.
Discharging Working Temperature -20℃~55℃ for the K model, compared to -30℃~60℃ for the N model.
The only really big difference, which seems to be often repeated on this forum, is the rated cycle life-- 6000 cycles for the K model compared to only 3500 cycles for the N model. HOWEVER-- The cycle life test is performed differently!!!!!! On the N models rating, they use a 1C charge/1C discharge for the test. And on the K model, it's only a 0.5c/0.5c charge and discharge.
They changed the test! It's very likely that if they had used the same testing regimen on both models, the difference in rated cycle life would not be nearly as large.
I feel that a 0.5c/0.5c testing regimen is more sensible for the real world conditions that a solar storage battery is likely to encounter for a lot of the users here. It is certainly closer to my own anticipated performance than the 1c/1c which was previously used.
Also, regarding the welded terminal issue-- The data sheets seem to imply that the cells are manufactured with a plain, flat terminal. I don't know if the welded terminals are being implemented by EVE for some customers or supply lines, or if they are being provided by a third party after the fact. It seems like this is an option that you need to inquire about when you are sourcing the cells if it makes a difference to you.
understand...that is how forum threads go, they wander off. I started a forum topic that has now wandered off from where I started it. It takes someone creating a whole new topic from where the thread has wandered and no one has yet. I think a lot of users, like me, look for "whats new" and notice these threads so I think anything we have posted will be seen if people want to look. I know I have posted on three threads what I found out about the studs because it was relevant to what was being discussed.This is to both Robert and Stepandwolf, your technical replies are a thing of beauty and hard work, but shouldn't they be in a part of the forum that people might see them and not in the for sale section? Please don't take that wrong as it was great learning from reading them, I'm just hoping people see them here. Thank you both!
Robert, you get a gold star.... I asked the vendor about the difference and you hit it on the head. She said:I just compared the spec sheets, and in general, the LF280K and LF280N are very similar in most regards. The K model is a few millimeters taller, it's terminals are spaced further apart compared to the N's, and the K also has a slightly more stringent requirements for the rated charging and discharging temperature limits:
Charging Working Temperature for the K model is 0℃~55℃, compared to 0℃~60℃ for the N model.
Discharging Working Temperature -20℃~55℃ for the K model, compared to -30℃~60℃ for the N model.
The only really big difference, which seems to be often repeated on this forum, is the rated cycle life-- 6000 cycles for the K model compared to only 3500 cycles for the N model. HOWEVER-- The cycle life test is performed differently!!!!!! On the N models rating, they use a 1C charge/1C discharge for the test. And on the K model, it's only a 0.5c/0.5c charge and discharge.
They changed the test! It's very likely that if they had used the same testing regimen on both models, the difference in rated cycle life would not be nearly as large.
I feel that a 0.5c/0.5c testing regimen is more sensible for the real world conditions that a solar storage battery is likely to encounter for a lot of the users here. It is certainly closer to my own anticipated performance than the 1c/1c which was previously used.
Also, regarding the welded terminal issue-- The data sheets seem to imply that the cells are manufactured with a plain, flat terminal. I don't know if the welded terminals are being implemented by EVE for some customers or supply lines, or if they are being provided by a third party after the fact. It seems like this is an option that you need to inquire about when you are sourcing the cells if it makes a difference to you.
Hey bossmav,If you pick them up that would save you $35.00 per set, total savings for 4 would be $140.00 If you need any type of service on your batteries I have all the contact info for Basen, warranty issues are handle by them.
Thank you.