Robaroni
New member
- Joined
- Jun 22, 2018
- Messages
- 17
Hello everyone,
Have been reading some of your builds - great work!
I thought I'd get some feedback and advice from those who have come before me.
Here's what I have and am doing:
I have a off grid/ intertie system in right now with 2 Outback 4836 inverters and charge controllers from Outback too. Total system is 4.4Kw. ( I do have another system in with 6.4Kw but it's just an intertie so it's not part of this design - yet anyway!) The system is presently running 8 Rolls L/A 530s batteries at the end of their life (~14 yrs)
This gives me ~80 to 90amps to work with for charging. I can reduce the current to the batteries but this also reduces my intertie output,. so I'll run the CC's to their max. or close to it.
I have 640 newTenergy LiFePO4 5.5aH batteries (32700) which I've done some prelimtesting on and they are up to specs.
What I think I'll do is set up something like Owitte did in Germany. I'll run 16s 38p. Because I already have upper and lower voltage setting ability all I'm planning on is balancing. Of course, as many of you know I can run several different 'S' and 'P' configurations and get the same results but I like the 38p because it keeps a pretty stable 3.2V pack (I'll fuse each battery). I am open to advice though.
I'd like a balancer that bluetooths or other wireless communications out to my PC so your thoughts on balancers that have worked for some of you is appreciated. I'm not against China if you guys haven't experienced excessive failures after time with certain ones although at 38p I question their ability to balance well. Hopefully the new Tenergy's won't need much!
Just as an aside, I usually charge my lithiums to 80% of max. This system isn't a full off grid, what I do is keep my batteries charged and when we have mains failures the batteries kick in for a day or two at most unless we have a major weather condition.
Thanks for the help,
Rob
Have been reading some of your builds - great work!
I thought I'd get some feedback and advice from those who have come before me.
Here's what I have and am doing:
I have a off grid/ intertie system in right now with 2 Outback 4836 inverters and charge controllers from Outback too. Total system is 4.4Kw. ( I do have another system in with 6.4Kw but it's just an intertie so it's not part of this design - yet anyway!) The system is presently running 8 Rolls L/A 530s batteries at the end of their life (~14 yrs)
This gives me ~80 to 90amps to work with for charging. I can reduce the current to the batteries but this also reduces my intertie output,. so I'll run the CC's to their max. or close to it.
I have 640 newTenergy LiFePO4 5.5aH batteries (32700) which I've done some prelimtesting on and they are up to specs.
What I think I'll do is set up something like Owitte did in Germany. I'll run 16s 38p. Because I already have upper and lower voltage setting ability all I'm planning on is balancing. Of course, as many of you know I can run several different 'S' and 'P' configurations and get the same results but I like the 38p because it keeps a pretty stable 3.2V pack (I'll fuse each battery). I am open to advice though.
I'd like a balancer that bluetooths or other wireless communications out to my PC so your thoughts on balancers that have worked for some of you is appreciated. I'm not against China if you guys haven't experienced excessive failures after time with certain ones although at 38p I question their ability to balance well. Hopefully the new Tenergy's won't need much!
Just as an aside, I usually charge my lithiums to 80% of max. This system isn't a full off grid, what I do is keep my batteries charged and when we have mains failures the batteries kick in for a day or two at most unless we have a major weather condition.
Thanks for the help,
Rob