zerberfert
Member
- Joined
- Apr 14, 2020
- Messages
- 58
Hello again,
First a little about my batteries. They are from the ring doorbell system. They consist of LG D2's (blues) and Panasonic A's (Greens). Here are some pics.
I am getting about 60% blues and 40% greens.
Lets talk about the IR of both (thanks Wolf).
The blues are averaging 36 mOhms and the greens 26 mOhms. The range of blues I am keeping 34-38 and the range of greens 24-28. Anything above those 2 ranges are being kicked out for other projects, not my powerwall. I was planning of putting the blues in the middle 3 rows and the greens in the out most 2 rows. The reason for this was because of the difference in IR between the 2 different batteries, even though it's not much. Thoughts on this?
My battery packs will be 14s115p. I could make it 120p but I am going to leave the last row in the pack open to be able add batteries to "bump" up an low performing pack. Hopefully it's not going to be needed.
Here is a pic:
Here is where I need some advice.Do I need to have all 4 bus bars (the red lines in the pic), or could I do with 2-3? This is going to be on the + side of the battery. What size fuse wire should I use for this? The way I drew the fuse wire setup in the pic, will that work? Or do I need to do something different?
On the - side I am going to useCell Level Nickel Fuse from batteryhookup.com. Again do I need 4 bus bars like in the pic for the + side, or can I get away with 2-3?
Cells are 3A cells and with 115p that is 345A per pack. I will start with a 5kw inverter and will probably use 3-4kw peak. 4000W/58V = 69A, 69A/115 cells = .6A a cell. Please check my Math. So, if yall figure that I need the 4 bus bars from the pic, could I go with 10 awg wire. A 10 awg wire can carry 30 amps, since there are 4 of them that should carry 120A. Almost double the 69A, calculated above.
Last set of questions. What size wire do I use for the bus bars? Also, do I use solid wire or stranded wire?
Thanks in advance,
Zerb
First a little about my batteries. They are from the ring doorbell system. They consist of LG D2's (blues) and Panasonic A's (Greens). Here are some pics.
I am getting about 60% blues and 40% greens.
Lets talk about the IR of both (thanks Wolf).
The blues are averaging 36 mOhms and the greens 26 mOhms. The range of blues I am keeping 34-38 and the range of greens 24-28. Anything above those 2 ranges are being kicked out for other projects, not my powerwall. I was planning of putting the blues in the middle 3 rows and the greens in the out most 2 rows. The reason for this was because of the difference in IR between the 2 different batteries, even though it's not much. Thoughts on this?
My battery packs will be 14s115p. I could make it 120p but I am going to leave the last row in the pack open to be able add batteries to "bump" up an low performing pack. Hopefully it's not going to be needed.
Here is a pic:
Here is where I need some advice.Do I need to have all 4 bus bars (the red lines in the pic), or could I do with 2-3? This is going to be on the + side of the battery. What size fuse wire should I use for this? The way I drew the fuse wire setup in the pic, will that work? Or do I need to do something different?
On the - side I am going to useCell Level Nickel Fuse from batteryhookup.com. Again do I need 4 bus bars like in the pic for the + side, or can I get away with 2-3?
Cells are 3A cells and with 115p that is 345A per pack. I will start with a 5kw inverter and will probably use 3-4kw peak. 4000W/58V = 69A, 69A/115 cells = .6A a cell. Please check my Math. So, if yall figure that I need the 4 bus bars from the pic, could I go with 10 awg wire. A 10 awg wire can carry 30 amps, since there are 4 of them that should carry 120A. Almost double the 69A, calculated above.
Last set of questions. What size wire do I use for the bus bars? Also, do I use solid wire or stranded wire?
Thanks in advance,
Zerb