This is what I found there, other forums say something similar.
"Shunt resisters are 430 ohm across each set of cells. When shunting
they draw V^2/R power, or roughly 16/430 or 40 mW each. There are 96
sets of cells, so if all but one was active, total power would be about
3.5 watts."
I suspect that the 420 ohm resistor is not a shunt load. Have you seen
the circuit?
On 14-Aug-19 4:22 PM, Bob Bath via EV wrote:
George, probably a stupid question, but I’m gathering you’ve already been on
mynissanleaf.com? I don’t know if the moderators pull anything like that off
immediately, but I look fwd to hearing what others have to say about this...
Sincerely,
Bob Bath
Note: any misspellings of the contents of this message are due to 54 y.o.
vision, hyperactive spell check changing what I typed, or fat fingering— not
cluelessness.
On Aug 13, 2019, at 9:14 PM, George Tyler via EV <[email protected]> wrote:
Has anyone had a good look at the operation of the Leaf BMS. Circuit is
very different, and so is the operation. First thing I noticed when I got
leafspy was that the BMS works ALL the time, not just above a certain voltage.
Leafspy also shows it working on the lowest cells, so it's not just a shunt?
the circuit shows inductors in series with all measuring wires to the
batteries, both sides of each cell. These points are then coupled together by
capacitors, the whole pack.
My thinking is that this could be energy transfer path between any cells and
multiple at the same time. This count be done via half bridge inverters on each
of the wires. I have searched, but find nothing, apart from some comments that
it is a small surface mount resistor that is the shunt, and only 7.5 mA. That
would actually do nothing for a 60ah battery.
On 14-Aug-19 3:06 PM, Mr. Sharkey via EV wrote:
A URL or name for this company would be appreciated.
Try this, although it seems some of the products are discontinued/out-of-stock:
https://evparts.com.au/ev-power-bms.html
Let me know once you have a few extra to sell.
This will likely be a fall/winter project, once the year's firewood is put up
and the outdoor chores cease due to the weather.
Another part of the repower project is going to be to rework a Todd Power
Source to be a lithium-compatible 36v charger. I'll probably run barefoot
without a BMS in the short term and carefully balance and charge manually until
I get something worked out.
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