mitchk1303
New Member
- Joined
- Feb 3, 2020
- Messages
- 52
If the battery makes it to 13.9 it's definitely full. It doesn't need to absorb there for any amount of time because pretty much anything over 13.7 is full if it's balanced. balancing starts kicking in a little bit around 13.6 and it's definitely in full swing near 13.8. the only reason you should bring your batteries up to 13.9 is for an occasional top balance and you could probably push up to 14.1 to 14.5 during the monthly equalization considering that your batteries are not having a problem staying balanced. You could use an equalization setting to do that once a month. The batteries naturally rest at 13.4 after they're done charging but it takes a lot of hours to drop down to 13.4. But if you only charge them to 13.5 they won't absorb much amperage and will take longer to charge. If I remember correctly, it's around 13.63 when the voltage starts to fly high fast signaling it's done charging. I would hope that smart lithium chargers could take advantage of this trait.
Since they rest at 13.4 if you're floating at 13.5 they'll remain at 100% unless you draw from them because your solar can't keep up with your load in the daytime. If the voltage gets down to 13.35 in the daytime I would hope that your charger would raise it up to 13.7 briefly just to make sure they're back to charged before dropping back to 13.5. that's only really necessary if you want them to remain at 100%. otherwise you could literally float them at 13.37 and they would stay above 95%. That's probably what most people should do unless they're battery bank is overly large then they could hold them at 13.3 instead. I hope I'm not confusing you LOL anyway I got to get back to work I'll check back again in a few days.
Ok I guess I was misunderstanding then. I thought you have your absorption voltage set at 14.07V? Or is that just the max voltage you will send to the battery? I think I am misunderstanding the absorption phase. Is the voltage you select for the absorption phase the voltage the battery will be brought up to or the voltage being sent to the battery (and the battery just reaches full, not necessarily that voltage)? The absorption phase should bring the voltage of the battery right to the float voltage (13.35V).
Either way do you think I should lower the absorption voltage to 13.7V or something lower then 13.9. I also don't understand the time factor with the absorption phase. But I'm assuming if I am reaching max capacity most days I probably want a low absorption time? I can turn on adaptive absorption so on shallow discharge days the absorption time is shorter.
It sounds like I should decrease my float voltage to 13.35 in order to preserve battery life? But basically if the battery is at 13.35 it is around 95 percent full correct?
Sorry I am so scattered. I feel pretty lost as I haven't ever dealt with this stuff but I think I am starting to get a small grasp on some subjects.