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Battery balancing:

Started by Ed Lee July 26, 2021
I am wiring up 4 banks of batteries with dip40 pin & zif.

Considering 4 battery banks:

Min 360V, Max 400V

_A_ _B_ _C_ _D_
370 380 390 400
400 390 380 370

connected with X ohm at Y duty

1. what Z AWG do i need?

X   Y   Z
1   10
5   25
10  50
ohm %   AWG

2. What is the equiv. W AWG for pin headers and 3M zif sockets

Z should be < W
Y can be lower


On Monday, July 26, 2021 at 11:14:31 PM UTC+10, Ed Lee wrote:
> I am wiring up 4 banks of batteries with dip40 pin & zif.
<snipped irrelevant detail> How much current are you going to draw from them? Or put to them when you are charging them? Pin headers and zero-insertion force connectors are specified in terms of the current they can carry. Wire gauge comes with a current rating as well. Too much current and they all get too warm. They do have a certain amount of thermal inertia (heat capacity) but not that much. Connectors are designed so that they are under stress when mated, and if they get too warm, the spring constant goes down and they don't mate as tightly, increasing the contact resistance, and the heat dissipated in the connector. -- Bill Sloman, Sydney
On Monday, July 26, 2021 at 11:14:31 PM UTC+10, Ed Lee wrote:
> I am wiring up 4 banks of batteries with dip40 pin & zif.
<snipped irrelevant detail> How much current are you going to draw from the batteries (or pump into them when charging them). This is all that matters to the connectors, which do have current ratings, and a recommended range of wire gauges (which can handle that sort of current). -- Bill Sloman, Sydney
On Monday, July 26, 2021 at 6:47:28 AM UTC-7, bill....@ieee.org wrote:
> On Monday, July 26, 2021 at 11:14:31 PM UTC+10, Ed Lee wrote: > > I am wiring up 4 banks of batteries with dip40 pin & zif. > <snipped irrelevant detail> > > How much current are you going to draw from the batteries (or pump into them when charging them).
40V (10A) max from A or D.
On Monday, July 26, 2021 at 6:54:41 AM UTC-7, Ed Lee wrote:
> On Monday, July 26, 2021 at 6:47:28 AM UTC-7, bill....@ieee.org wrote: > > On Monday, July 26, 2021 at 11:14:31 PM UTC+10, Ed Lee wrote: > > > I am wiring up 4 banks of batteries with dip40 pin & zif. > > <snipped irrelevant detail> > > > > How much current are you going to draw from the batteries (or pump into them when charging them). > 40V (10A) max from A or D.
Simple deduction from detail that you skipped: (400V - 360V) / 10 ohm.
On Monday, July 26, 2021 at 6:55:52 AM UTC-7, Ed Lee wrote:
> On Monday, July 26, 2021 at 6:54:41 AM UTC-7, Ed Lee wrote: > > On Monday, July 26, 2021 at 6:47:28 AM UTC-7, bill....@ieee.org wrote: > > > On Monday, July 26, 2021 at 11:14:31 PM UTC+10, Ed Lee wrote: > > > > I am wiring up 4 banks of batteries with dip40 pin & zif. > > > <snipped irrelevant detail> > > > > > > How much current are you going to draw from the batteries (or pump into them when charging them). > > 40V (10A) max from A or D. > Simple deduction from detail that you skipped: (400V - 360V) / 10 ohm.
(400V - 360V) / 40 ohm = 1A min (400V - 360V) / 4 ohm = 10A max.
On Monday, July 26, 2021 at 6:57:48 AM UTC-7, Ed Lee wrote:
> On Monday, July 26, 2021 at 6:55:52 AM UTC-7, Ed Lee wrote: > > On Monday, July 26, 2021 at 6:54:41 AM UTC-7, Ed Lee wrote: > > > On Monday, July 26, 2021 at 6:47:28 AM UTC-7, bill....@ieee.org wrote: > > > > On Monday, July 26, 2021 at 11:14:31 PM UTC+10, Ed Lee wrote: > > > > > I am wiring up 4 banks of batteries with dip40 pin & zif. > > > > <snipped irrelevant detail> > > > > > > > > How much current are you going to draw from the batteries (or pump into them when charging them). > > > 40V (10A) max from A or D. > > Simple deduction from detail that you skipped: (400V - 360V) / 10 ohm. > (400V - 360V) / 40 ohm = 1A min > (400V - 360V) / 4 ohm = 10A max.
Is AWG 22 good enough for 10A@10%?
On 2021-07-26, Ed Lee <edward.ming.lee@gmail.com> wrote:
> On Monday, July 26, 2021 at 6:57:48 AM UTC-7, Ed Lee wrote: >> On Monday, July 26, 2021 at 6:55:52 AM UTC-7, Ed Lee wrote: >> > On Monday, July 26, 2021 at 6:54:41 AM UTC-7, Ed Lee wrote: >> > > On Monday, July 26, 2021 at 6:47:28 AM UTC-7, bill....@ieee.org wrote: >> > > > On Monday, July 26, 2021 at 11:14:31 PM UTC+10, Ed Lee wrote: >> > > > > I am wiring up 4 banks of batteries with dip40 pin & zif. >> > > > <snipped irrelevant detail> >> > > > >> > > > How much current are you going to draw from the batteries (or pump into them when charging them). >> > > 40V (10A) max from A or D. >> > Simple deduction from detail that you skipped: (400V - 360V) / 10 ohm. >> (400V - 360V) / 40 ohm = 1A min >> (400V - 360V) / 4 ohm = 10A max. > > Is AWG 22 good enough for 10A@10%?
That's about 3A RMS, so maybe. -- Jasen.
On Monday, July 26, 2021 at 2:01:00 PM UTC-7, Jasen Betts wrote:
> On 2021-07-26, Ed Lee <edward....@gmail.com> wrote: > > On Monday, July 26, 2021 at 6:57:48 AM UTC-7, Ed Lee wrote: > >> On Monday, July 26, 2021 at 6:55:52 AM UTC-7, Ed Lee wrote: > >> > On Monday, July 26, 2021 at 6:54:41 AM UTC-7, Ed Lee wrote: > >> > > On Monday, July 26, 2021 at 6:47:28 AM UTC-7, bill....@ieee.org wrote: > >> > > > On Monday, July 26, 2021 at 11:14:31 PM UTC+10, Ed Lee wrote: > >> > > > > I am wiring up 4 banks of batteries with dip40 pin & zif. > >> > > > <snipped irrelevant detail> > >> > > > > >> > > > How much current are you going to draw from the batteries (or pump into them when charging them). > >> > > 40V (10A) max from A or D. > >> > Simple deduction from detail that you skipped: (400V - 360V) / 10 ohm. > >> (400V - 360V) / 40 ohm = 1A min > >> (400V - 360V) / 4 ohm = 10A max. > > > > Is AWG 22 good enough for 10A@10%? > That's about 3A RMS, so maybe.
I think the zif socket would be a problem. Around 1A perhaps. Might have to increase R (and power lost) or more units: A to F.
On Monday, July 26, 2021 at 11:55:52 PM UTC+10, Ed Lee wrote:
> On Monday, July 26, 2021 at 6:54:41 AM UTC-7, Ed Lee wrote: > > On Monday, July 26, 2021 at 6:47:28 AM UTC-7, bill....@ieee.org wrote: > > > On Monday, July 26, 2021 at 11:14:31 PM UTC+10, Ed Lee wrote: > > > > I am wiring up 4 banks of batteries with dip40 pin & zif. > > > <snipped irrelevant detail> > > > > > > How much current are you going to draw from the batteries (or pump into them when charging them). > > 40V (10A) max from A or D. > Simple deduction from detail that you skipped: (400V - 360V) / 10 ohm.
Not such a simple deduction - the 400V - 360 V could equally have denoted a voltage range. If it is isn't labelled amps, it isn't safe to jump to conclusions. -- Bill Sloman, Sydney