[Oeva-list] Lee Hart Battery balancer mail thread

Tim Kutscha tim_kutscha at yahoo.com
Sun Mar 18 20:01:08 PST 2007

Hi Don,

  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.

Tim Kutscha

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.


Thank you





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 
need to 
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
Forget the 
perfect offering
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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