Yes..used. 26 max and what is the disconnect?Is this a BYD used pack? There are many threads on this... the jist is, figure at best you are getting 26V in them... they will not charge to 100%, you will just waste watts trying.
In my experience, and that of many others the BYD batteries settle at approx. 26.4 after charging. Bulk charge set can be anywhere from 27.2 to 28.8, depending on how hard you want to push them. I go with a conservative profile, due to their used condition and unknown longevity. I also float at 26.6, as I have significant loads throughout the day. Here's a good thread for an expanded discussion on these batteries:Yes..used. 26 max and what is the disconnect?
I changed it to 28. Look like water damage?
Anyone know what wrong?
Glad I ran across this post. I have 4 of them and I had been wondering how closely I should be trying to get these cells balanced. So far 43mv is the worst I have seen and one battery is at 7mv. Still working on getting them all more closely balanced to each other before I put them into service.I have a bunch of these byd's, all have the discoloration on the negative buss bar. My Byd's are playing nice with each other at 27.2v absorbtion for 5 min and constant float at 26.9v all day on solar. I have no bms, they are staying 20-60mv between cells.
Glad I ran across this post. I have 4 of them and I had been wondering how closely I should be trying to get these cells balanced. So far 43mv is the worst I have seen and one battery is at 7mv. Still working on getting them all more closely balanced to each other before I put them into service.
That's a good idea.
The cells will go progressively farther and farther out of balance as they reach overcharge and undercharge states to the point where single cell damage can occur.