[Oeva-list] Lee Hart Battery balancer mail thread
tim_kutscha at yahoo.com
Sun Mar 18 20:01:08 PST 2007
I'd like to put in an order request for bare boards only (1 controller and 3 relay boards). Just let me know where to send the deposit.
p.s. If I had to put in a request for an option, I would say design a simple system that is expandable. For example a simple system could easily be expanded to more relays and temperature sensors if a "master" board could talk to several "expansion" boards (such as temperature measurement systems or relay boards) over a common bus like i2c. I suppose we could make a bunch of EVILbus boards...
----- Original Message ----
From: "Theoldcars at aol.com" <Theoldcars at aol.com>
To: pwallace at ichips.intel.com; jrab at e-m-w.com; gary.graunke at intel.com; steveclunn at bellsouth.net
Cc: leeahart at earthlink.net; ev at listproc.sjsu.edu; oeva-list at oeva.org
Sent: Wednesday, March 14, 2007 3:58:52 PM
Subject: Re: [Oeva-list] Lee Hart Battery balancer mail thread
Lee has asked for an email describing what you want below in Green.
I have sent this to everyone who has responded. In case I missed anyone I
included the EV list. I am also going to send this on to some other list that
this balancer would really help with.
1. Question below by Paul can we add temperature probes?
2. In a prior email in red below Lee brought up saving manufacturing
The above one and two going different directions. I would be for spending
the extra money for more options. I have little doubt in a short time we will be
working with lithium batteries. Heat is a critical factor with them as well as
other battery technologies. The savings I am for is producing more so the
cost is reduced.
Please respond to all to keep everyone informed.
In a message dated 3/14/2007 1:11:15 PM Pacific Daylight Time,
paul.wallace at intel.com writes:
The design as it stands doesn't have enough temperature
probe ports for
NiMh. I think that we need one probe per
battery. It is probably
possible to add a multiplexer for multiple
temperature probes and let
the stamp select them at the same time it is
selecting the battery it is
going to measure voltage
> Specifically, the old control board used an
external digital multimeter
> with isolated RS-232 output to measure
battery voltage and current. They
> cost $50-$100. I'm experimenting with
a cheaper on-board circuit to do
> this (since everyone is obsessed with
Yes, there's an order in the works. I'm trying to work
out the final
details, and figure out how many to order, and what features
want/need. Stay tuned!
What would help is if interested
parties send me an email describing
what they want;
1. Bare boards
only (with schematics and parts lists)
2. Parts kits (boards with parts,
which you assemble yourself)
3. Assembled boards (which you just need to
be put into a box)
On the software side, I don't have the time/resources
to supply more
than a demo program (what I'm using for my own EV). You will
change the program to suit your battery pack (number of batteries,
voltage per battery), the balancing method you want to use (if different
from mine), and other auxiliary functions (like temperature measurement,
charger control, fan control, heater control, etc.) So, I would suggest
that you buy your own BASIC Stamp with its development kit, so you can
make these changes.
Time: This is a side project for me. I have a
backlog of other contracts
ahead of this one that I need to finish first, so
delivery is probably
going to be 2-3 months.
Note: Just saying you
want one won't make it so. Serious orders only!
It's too expensive a project
for me to order all the parts on the CHANCE
that you MIGHT buy it. Once I
know how many we need, then I can quote a
price. When folks pay for it, I
place the orders.
Ring the bells that still can ring
There is a crack in everything
That's how the light gets
in -- Leonard Cohen
Lee A. Hart, 814 8th Ave
N, Sartell MN 56377,
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