[Oeva-list] Last Call Lee Hart Battery balancer mail thread
Theoldcars at aol.com
Theoldcars at aol.com
Thu Apr 19 00:04:56 PDT 2007
We have gone one month and it is time to now to place the order. I have sent
this on to any groups that I thought would be interested.
Anyone wanting to review here is the link and past emails are below.
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
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 cost.
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
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
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 on.
> 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 cost).
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 people
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, leeahart_at_earthlink.net
************************************** See what's free at http://www.aol.com.
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