Set the charging to stop at 27.60 and put the battery in service. Possibly put an active balancer on.
I've got one on order. Should be delivered tomorrow and I'll pick it up on Sunday.I would put the active balancer on it and save all the headaches just make sure you get the 5amp balancer.
I made the changes you mentioned. However, I don't see in the settings on where to change the boost/absorption nor the float. I am using the app on an iPhone if that matters.@LivingTheDream how is your balance algorithm configured?
I would set it to balance threshold to 3.45 volts per and the delta trigger to 10mv
Until the cells come with to a delta of less than <50 mv I suggest you have it balance all the time not just during charging.
Also make your normal runtime charge profile...
boost/absorption = 3.55 volts per
float = 3.35 volts per
No, I didn't. I'll do that now. Do I need to use oxguard/noalox? If so, is that found on Amazon or...?@LivingTheDream did you scuff the terminals with fine grit sandpaper and clean them with isopropyl before you did the final assembly? Did you use oxguard or noalox? You need good clean terminals to make good connections for maintaining well-balanced batteries. These variances can be indicative of poor connections due to dirty terminals.
Those are settings for the your charger.I made the changes you mentioned. However, I don't see in the settings on where to change the boost/absorption nor the float. I am using the app on an iPhone if that matters.
Are you using tinned lugs? If not, you can probably get by without it. Doesn't hurt to use it, though. Yes you can probably find either on Amazon. I used Oxguard. Apply it after you've cleaned your terminals and bus bars. Some use a lint-free qtip, I put on a nitrile glove (non-powdered), put a dab on my finger, and spread a very thin layer across the terminal and on the busbar where it contacts the terminal. You don't need a lot, and you don't want to "goop" it on.No, I didn't. I'll do that now. Do I need to use oxguard/noalox? If so, is that found on Amazon or...?
Ok, I just sanded the terminals and bus bars. Hooked everything back up and I'm still out of whack on three of the cells. I'll work on bringing those down a bit and see what happens. I'll order some oxguard for the final build out. I'm not sure if the lugs are tinned, just what came from Doshan.Are you using tinned lugs? If not, you can probably get by without it. Doesn't hurt to use it, though. Yes you can probably find either on Amazon. I used Oxguard. Apply it after you've cleaned your terminals and bus bars. Some use a lint-free qtip, I put on a nitrile glove (non-powdered), put a dab on my finger, and spread a very thin layer across the terminal and on the busbar where it contacts the terminal. You don't need a lot, and you don't want to "goop" it on.
I'll try to bring the high ones down with a load. In the mean time, I'll be getting the balancer over the weekend. Why does @Will Prowse not care so much for the active balancers? Or did I misunderstand him in his balancing video?To accelerate the balancing of the pack you could float it at 3.5 volts for a couple of days.
It will cause some short term stress on the battery in order to get more capacity over the operational life of the battery.
I'm not privy to your thoughts or to Will's.I'll try to bring the high ones down with a load. In the mean time, I'll be getting the balancer over the weekend. Why does @Will Prowse not care so much for the active balancers? Or did I misunderstand him in his balancing video?
I guess what I meant was, are there draw backs to using a balancer?I'm not privy to your thoughts or to Will's.
Yes.I guess what I meant was, are there draw backs to using a balancer?
Here you have cells in positions 3,4,8 and possibly 6 that are different (lower capacity). I strongly recommend that you combine them with the 4 or 5 low capacity outliers in your other group.I turned on the charger and within a few minutes, here is where I am already. It's as if I didn't even try to bring these voltages together.
Really? I'm not sure when that would've been. I watch them like a hawk. What makes you say that (so I don't do it again)?Yes.
They can undo the top balance of your pack.
I read through some of your old posts and it seems you grossly overcharged these cells at some point.
I think an active balancer is probably the way to go.
I'll do this tomorrow and see how that evens things out.Here you have cells in positions 3,4,8 and possibly 6 that are different (lower capacity). I strongly recommend that you combine them with the 4 or 5 low capacity outliers in your other group.
Just a little effort matching your cells into like 8S sets will reduce what a balancer needs to do. I spent a LOT of time doing this and it works really well.
You labelled your cells and noted all that you’ve done and the voltages and the cell position, right?I'll do this tomorrow and see how that evens things out.
Any local hardware store should have it. Get the smallest tube as it will last a lifetime for a hobbyist.I'll order some oxguard for the final build out.
Yes, on this set. I didn't do a very good job on the first set though, but I'll hook them back up and make note of the results in order to match them up.You labelled your cells and noted all that you’ve done and the voltages and the cell position, right?
after you sanded them, did you clean them off with isopropyl alcohol?Ok, I just sanded the terminals and bus bars. Hooked everything back up and I'm still out of whack on three of the cells. I'll work on bringing those down a bit and see what happens. I'll order some oxguard for the final build out. I'm not sure if the lugs are tinned, just what came from Doshan.
Yes sirafter you sanded them, did you clean them off with isopropyl alcohol?
My mistake got you confused with someone else.Really? I'm not sure when that would've been. I watch them like a hawk. What makes you say that (so I don't do it again)?
@MisterSandals do you you think it's worthwhile trying to match these cells? I've been watching them over the last three days taking readings in the morning and evening. They don't seem to be drifting too much. However, there is one cell in each group that is lower that the rest. I've changed the colors to the four highest of each set.Here you have cells in positions 3,4,8 and possibly 6 that are different (lower capacity). I strongly recommend that you combine them with the 4 or 5 low capacity outliers in your other group.
Just a little effort matching your cells into like 8S sets will reduce what a balancer needs to do. I spent a LOT of time doing this and it works really well.