EV Digest 3866
Topics covered in this issue include:
1) minutes from SFEAA meeting
by Sherry Boschert <[EMAIL PROTECTED]>
2) Re: Curtis 1231C Heatsink
by "M.G." <[EMAIL PROTECTED]>
3) Vehicle Preheat Idea
by "Patrick Maston" <[EMAIL PROTECTED]>
4) Re: Vehicle Preheat Idea
by [EMAIL PROTECTED]
5) Re: Vehicle Preheat Idea
by "Doug Hartley" <[EMAIL PROTECTED]>
6) Re: Vehicle Preheat Idea
by "Bob Rice" <[EMAIL PROTECTED]>
7) Re: Scooter battery balancer
by "Steve Clunn" <[EMAIL PROTECTED]>
8) RE: Vehicle Preheat Idea
by "John Foster" <[EMAIL PROTECTED]>
9) Re: Scooter battery balancer
by "Joe Smalley" <[EMAIL PROTECTED]>
10) Re: K&W Website
by "Mark Hanson" <[EMAIL PROTECTED]>
11) Re: FW: K&W Website
by [EMAIL PROTECTED]
12) Boston area EVent (Belmont, MA) Saturday 10/23/04
by Jim Coate <[EMAIL PROTECTED]>
13) I had a dream
by "Lawrence Rhodes" <[EMAIL PROTECTED]>
14) Re: [alternatefuelvehicles] Barred from all 543 classes, the Prius creates a new
one at Bonneville
by Lee Dekker <[EMAIL PROTECTED]>
15) Interesting motor?
by "bholmber" <[EMAIL PROTECTED]>
16) RE: Interesting motor?
by "Myles Twete" <[EMAIL PROTECTED]>
17) Another motor aquisition, and other potential EV stuff.
by James Massey <[EMAIL PROTECTED]>
18) Odd license request
by Paul G <[EMAIL PROTECTED]>
19) Re: Scooter battery balancer
by Lee Hart <[EMAIL PROTECTED]>
20) Re: Curtis 1231C Heatsink
by Lee Hart <[EMAIL PROTECTED]>
21) Re: Scooter battery balancer
by Lee Hart <[EMAIL PROTECTED]>
22) Re: Scooter battery balancer
by Lee Hart <[EMAIL PROTECTED]>
23) Re: Curtis 1231C Heatsink
by Lee Hart <[EMAIL PROTECTED]>
24) Re: Vehicle Preheat Idea
by Lee Hart <[EMAIL PROTECTED]>
25) Escape Hybrid website
by "Joe Smalley" <[EMAIL PROTECTED]>
--- Begin Message ---
Here are the minutes from SFEAA's first meeting.
Please send me a correction if I got any names or
details wrong.
In the future, these will go out only to people who
join the chapter listserv. If you want to be on the
listserv, let me know.
Sherry
SFEAA MINUTES
Inaugural meeting, October 16, 2004
Twenty people turned out for the first meeting of the
San Francisco Chapter of the Electric Auto Association
at Marc Geller�s house, 847 Haight Street, S.F.
After introductions all around, Marc and Sherry
Boschert spoke about why there�s a need for a San
Francisco EAA chapter. Marc gave an update on the
successful Greenpeace and Jumpstart Ford campaign to
save the electric Ford Th!nks.
Twelve people agreed to become members of the chapter
(five already have EAA memberships). To become a
member, go to: http://eaaev.org/eaamembership.html
The members present elected Sherry as chapter
president and Marc as chapter vice
president/treasurer.
We decided to hold regular monthly meetings on the
first Saturday of each month from 11 a.m. to 1 p.m.
The next meeting is November 6 at the home of Sherry
Boschert and Meg Newman, 1484 16th Avenue, SF, between
Judah & Kirkham in the Inner Sunset; 415-681-7716 or
[EMAIL PROTECTED]
Ron Freund, chair of the EAA, welcomed people to the
chapter and gave a bit of history and background of
EAA, and where it�s headed.
Lawrence Rhodes reported on the successful Silicon
Valley EV Ralley. We announced the next meetings of
the North Bay EAA and the East Bay EAA.
Steve Roseman talked about the advantages of electric
bicycles and encouraged people to test-ride them at
either Avenue Cyclery at 756 Stanyan in the Haight
Ashbury or at Noe Valley Cyclery, 4193 24th Street.
Lawrence Rhodes announced that he�ll be organizing a
series of classes for Monday nights on building
electric vehicles of all kinds. If you�re interested,
contact him at [EMAIL PROTECTED]
We spent a fair amount of time brainstorming on ideas
for the new chapter�s activities and goals. For
starters, the following people agreed to pursue the
following tasks:
- Greg Simon � media for chapter, and liaison with SF
Bicycle Coalition/Transportation for a Livable City
- John Martin � chapter photographs
- Jon Johansen � chapter web site design
- Will Patterson � create FAQ section for web site,
print materials
- Bob Burnside � chapter newsletter
- Mike Marrelli � initiate contact with SF schools for
presentations & projects
- Nic Griffin � initiate contacts with SF City and
Airport about free metered street parking and free
parking in City and Airport garages for vehicles with
California State Clean Air Decals (as is offered in
San Jose, LA, LAX, and elsewhere)
- Meg Newman � initiate contact with local mechanic
about servicing EVs
- Sherry Boschert � file as formal chapter with
national EAA
- Marc Geller � research political activities
permitted under EAA�s 501c3 status
We then adjourned to Marc�s garage to look over
everyone�s fabulous EVs.
NEXT MEETING: SATURDAY, NOVEMBER 6, 11 a.m. � 1 p.m.
1484 16th Avenue, San Francisco (between Judah/Irving
in the Inner Sunset;
MUNI�s N-Judah stops at the corner; if you�re driving,
turn off of Kirkham)
Contact: Sherry Boschert or Meg Newman, 415-681-7716;
[EMAIL PROTECTED]
ALL ARE WELCOME, WHETHER YOU VOLUNTEER FOR A TASK OR
NOT!!
--- End Message ---
--- Begin Message ---
I thought heat sinks were rated in square inches of exposed surface.
Mike G.
Patrick Maston wrote:
leeahart wrote:
For example, the Curtis heatsink is 12" x 9" x 2" = 209 cu.in.
So we get to count the void space between the fins of the heatsink as
part of the volume needed?
Thanks,
Patrick
--- End Message ---
--- Begin Message ---
Would it be OK to mount an on-board charger in the passenger compartment
to use its cooling air to preheat the interior? Would it work?
Thanks,
Patrick
1981 Jet Electrica
Patrick Maston
Division Chief, Special Operations
Henderson Fire Department
240 Water Street
Henderson, Nevada 89015
Home: 702-210-4005
Office: 702-267-2218.
Fax: 702-267-2223
Email: [EMAIL PROTECTED]
Web: www.cityofhenderson.com
Confidentiality Notice: This email message is for the sole use of the
intended recipient(s) and may contain confidential and privileged
information. Any unauthorized review, use, disclosure, distribution, or
copying is prohibited. If you are not the intended recipient, please
contact the sender by replying to this e-mail and destroy/delete all
copies of this e-mail message.
--- End Message ---
--- Begin Message ---
I guess it would depend on the charger! I have a 72 Datsun truck with 20 6
volt floodeds. I have a K & w charger. When I Charge overnite, it draws
15amps to start. when I get up it is only drawing 1 amp. The charger is in the cab
of the truck and
doesn't seem to warm up the the truck!
Larry Cronk
--- End Message ---
--- Begin Message ---
Yes, assuming a properly packaged and mounted charger and wiring for a safe
installation, and you time charging at fairly high current for when you need
the warmth.
My 2 EVs have their chargers mounted on the center transmission tunnel (in
front of the shifter, under dash) and help pre-heat the passenger
compartment. In cold weather I stop the charging before going to bed,
leaving the battery heaters working. I switch on the charger in the morning
to run while having breakfast and getting ready to go to work. This warms
the battery pack a bit more also. Note that this is done mainly with the
pickup having Thunder Sky Li Ion cells , which don't mind being left not at
full charge overnight or during use within the remaining capacity. If your
charging has tapered off to just a couple of Amps of finishing charge for
lead acid at the time you want to pre-heat, you probably won't get much
useful heat out of the charger at that point. I also have a 120V car warmer
heater I can plug in to pre-heat a lot on cold days.
Best Regards,
Doug
----- Original Message -----
From: "Patrick Maston" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, October 21, 2004 10:29 PM
Subject: Vehicle Preheat Idea
Would it be OK to mount an on-board charger in the passenger compartment
to use its cooling air to preheat the interior? Would it work?
Thanks,
Patrick
1981 Jet Electrica
Patrick Maston
Division Chief, Special Operations
Henderson Fire Department
240 Water Street
Henderson, Nevada 89015
Home: 702-210-4005
Office: 702-267-2218.
Fax: 702-267-2223
Email: [EMAIL PROTECTED]
Web: www.cityofhenderson.com
Confidentiality Notice: This email message is for the sole use of the
intended recipient(s) and may contain confidential and privileged
information. Any unauthorized review, use, disclosure, distribution, or
copying is prohibited. If you are not the intended recipient, please
contact the sender by replying to this e-mail and destroy/delete all
copies of this e-mail message.
--- End Message ---
--- Begin Message ---
----- Original Message -----
From: "Patrick Maston" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, October 21, 2004 10:29 PM
Subject: Vehicle Preheat Idea
> Would it be OK to mount an on-board charger in the passenger compartment
> to use its cooling air to preheat the interior? Would it work?
>
> Thanks,
>
> Patrick
> 1981 Jet Electrica
Hi Pat an' All;
> I plan on just that! My PFC 20 puts out a good amount of heat. Plan to
mount it in the car, recirculating in the cabin, the cooling air, for the
winter months, and overboard in the summer.
Seeya
Bob
--- End Message ---
--- Begin Message ---
----- Original Message ----- >
> I agree with damon, but was that idea mentioned about a zener diode and
> a light bulb.... are there (affordable) zener diodes that could shunt a
> real charging current, i.e. 25A?
That's what the light bulb is for . If you have a 5 watt 13.8v zener the
most it could pass would be a little less that 1/3 an amp without burning
out, so the light bulb will help buy limitting the current . A light bulb
works good here for a few reasnons , when cool it will pass more current ,
it will act like a fuse if the zener blows . It's not the perfect answer ,
but simple and will pass some of the current around the battery at the end
of the charge when your charging current should be low ,
zener's are cheep ,
> I guess it would be easier to have a "voltage detector" that shuts off
> the unregulated charger and turns on my three 12V 3A "smart" chargers
> once the first battery comes up to say 13.5V or so.
>
I think this is kind of what Lee is doing , except using his bsm to finnish
charge. Why 13.5 v I would go higher like 14.5
steve clunn
> Markus
>
--- End Message ---
--- Begin Message ---
My Zivan NG3 is mounted inside the firewall. The car does get quite
warm. I've thought of setting a timer to have the charge end in the
morning when it gets driven, but here comes the catch. Cars loose heat
so fast, and the length of charge varies depending on the day's driving.
So it would either be chronically undercharging, or often too cool.
Safety wise, it is riskier to have high voltage wires coming into the
cab. They should be in conduit or jacketed I suppose. Also it is a
little worse for the charger, as it gets warm with the rest of the cab.
The reason I have enough space "under" my dash is that the original dash
was so ugly with it's 70's style fake plastic wood paneled ashtray and
broken glove box, that I had to saw it off. I put the heater blower
under the hood. I regret not having a recirculation blocker when I'm
stopped behind badly tuned ICE vehicles. Randy Holmquist of Canadian
Electric Vehicles recommended I mount it on the back of the rear seat,
but I like my cargo volume, and often remove the rear seat. The Zivans
are not in the slightest bit weather proof, and shouldn't be under the
hood without an external case.
- John
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Patrick Maston
Sent: October 21, 2004 7:30 PM
To: [EMAIL PROTECTED]
Subject: Vehicle Preheat Idea
Would it be OK to mount an on-board charger in the passenger compartment
to use its cooling air to preheat the interior? Would it work?
Thanks,
Patrick
1981 Jet Electrica
Patrick Maston
Division Chief, Special Operations
Henderson Fire Department
240 Water Street
Henderson, Nevada 89015
Home: 702-210-4005
Office: 702-267-2218.
Fax: 702-267-2223
Email: [EMAIL PROTECTED]
Web: www.cityofhenderson.com
Confidentiality Notice: This email message is for the sole use of the
intended recipient(s) and may contain confidential and privileged
information. Any unauthorized review, use, disclosure, distribution, or
copying is prohibited. If you are not the intended recipient, please
contact the sender by replying to this e-mail and destroy/delete all
copies of this e-mail message.
--- End Message ---
--- Begin Message ---
I need to test the charger software somehow. The little 2.5 AHr AGMs don't
take long enough to cycle and the rapid voltage rise at the end of the bulk
stage causes the voltage control algorithm to overshoot too much. The SVRs
are much more predictable.
It is rather amazing that the PFC-20 will charge anything from a little 3.6
volt NiCd cordless phone battery up to the big AGM pack in Gone Postal with
no hardware changes and no damage.
Having five electric R/C cars creates a substantial need for NiCd charge
cycles.
The software based charger is getting a workout. I think I have nearly 2000
full or partial charge cycles recorded on the hard disks now.
The architecture is changing to better accommodate Regbus feedback.
Joe Smalley
Rural Kitsap County WA
Fiesta 48 volts
NEDRA 48 volt street conversion record holder
[EMAIL PROTECTED]
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, October 21, 2004 8:37 AM
Subject: Re: Scooter battery balancer
> I love it! A charger worth 10x the cost of the toy jeep, and 50x the cost
> of the batteries!
>
> Can't say enough good things about my PFC-30 :-)
>
> - Steven Ciciora
>
> > My son's Jeep uses two SVR-14 batteries. I normally charge them in
> > parallel
> > and discharge them in series with no problems. I have been experimenting
> > with two Rudman Mk2-b Regulators feeding back into a PFC-20 to turn it
> > down
> > at the end of charge. It reduces the charge time by a third. Series
> > charging
> > is faster because 20 amps of bulk current is a higher wattage at 24
Volts
> > than it is at 12 Volts.
>
--- End Message ---
--- Begin Message ---
I tried www.kta-ev.com and it worked ok. Ken Koch I thought helped design &
sells the K&W charger so maybe he could help.
----- Original Message -----
From: "Chuck Hursch" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, October 20, 2004 6:38 PM
Subject: Re: K&W Website
> When I had to contact K&W about my blown BC-20 charger back in
> 2000, I sent email to [EMAIL PROTECTED] On a very
> quick search just now, I could not find their webpage. There was
> one quick mention of a URL in the solstice archives (but that did
> not work).
>
> ----- Original Message -----
> From: "Don Cameron" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Tuesday, October 19, 2004 12:17 PM
> Subject: K&W Website
>
>
> > Does anyone have the web address for K&W? I cannot find a
> working URL in
> > the ev list or on google.
> >
> > thanks
> > Don
> >
> >
> >
> > See the New Beetle EV Conversion Web Site at
> > www.cameronsoftware.com/ev/
> >
>
--- End Message ---
--- Begin Message ---
The OLD K&W site can be found at...
http://web.archive.org/web/20020606141949/http://home.att.net/~kwengineering/
or http://tinyurl.com/4nzar
This site was removed from service in the latter part of 2002.
"Whether you think you can or think you can't, you are right!" --Henry Ford
"Stay Charged!" -- Hump
from Chuck:
>
>
> When I had to contact K&W about my blown BC-20 charger back in 2000, I
> sent
> email to [EMAIL PROTECTED] On a very quick search just now,
> I
> could not find their webpage. There was one quick mention of a URL in the
> solstice archives (but that did not work).
>
> ----- Original Message -----
> From: "Don
>
>
>> Does anyone have the web address for K&W? I cannot find a
> working URL in
>> the ev list or on google.
>>
>> thanks
>> Don
>>
>>
>>
>> See the New Beetle EV Conversion Web Site at
>> www.cameronsoftware.com/ev/
>>
>
--- End Message ---
--- Begin Message ---
BELMONT COMMUNITY ENVIRONMENTAL FAIR
Saturday, October 23, 2004
10am - 4pm
Belmont High School
221 Concord Avenue
Free Admission!
There will be all the 'regular' types of environmental exhibitors
(including free(?) fair trade coffee), and for vehicles should see a
grease car, natural gas cars, segway, hybrids, and perhaps a fuel cell
car (or just press releases about a fuel cell car?). And of course at
least one electric vehicle, being mine.
It would be fantastic to get more EV's, so if you have an EV and are in
the area, get there by 9am and you can likely get it in on display near
the door to the field house, or come by anytime and park along the road
with the hybrids.
(And say "hi" to the guy with the red truck if you come :-)
See
http://www.town.belmont.ma.us/Public_Documents/BelmontMA_WebDocs/townlinks/envfair
for details
_________
Jim Coate
1970's Elec-Trak
1992 Chevy S-10 BEV
1997 Chevy S-10 NGV
http://www.eeevee.com
--- End Message ---
--- Begin Message ---
Last nights dream for me was one of protest over not having electric cars.
I think I dreamed a couple of senarios like being on top a large building
and the Golden Gate bridge with banners. I got the ear of the press and
told the Govenator that the Girly Men were the CARB board for caving in to
the car company interests just as advanced battery technology capable of
making electrics attractive to the general public came about. In my dream
I also realized the only major car company that had all the right parts put
together was Nissan with their Ultra & the hypermini.prototype.(apologies to
AC Propulsion but it is a dream) You don't hear anything about those being
crushed. I'm thinking Nissan has something up their sleeve. Some people
think dreams don't mean anything. But why take a chance. I'm giving Nissan
a call today. Lawrence Rhodes..........
--- End Message ---
--- Begin Message ---
Them are some serious modifications on the Prius. Too bad Toyota hasn�t (yet) put that
same degree of effort into building a Plug In concept Prius.
Does this mean that the Chrysler Plug In hybrid Sprinter Van will be able to go the
Bonneville and claim another first.
Much grass IBB
--- ItalysBadBoy <[EMAIL PROTECTED]> wrote:
>
> Sport: Got Hybrid?
>
> Barred from every one of Bonneville's 543 classes, the Toyota Prius creates a new
> one.
> BY AARON ROBINSON
> PHOTOGRAPHY BY JEFFREY G. RUSSELL
> November 2004
> http://www.caranddriver.com/article.asp?section_id=4&article_id=8695&page_number=1
>
>
>
>
>
> What Bush says...."I'm the commander - see, I don't need to explain - I do not need
> to
> explain why I say things. That's the interesting thing about being the president.
> Maybe
> somebody needs to explain to me why they say something, but I don't feel like I owe
> anybody an explanation."
> (Aug 20, 2002 - interview by Bob Woodward, Crawford, TX)
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> ---------------------------------
> Do you Yahoo!?
> vote.yahoo.com - Register online to vote today!
__________________________________
Do you Yahoo!?
Yahoo! Mail Address AutoComplete - You start. We finish.
http://promotions.yahoo.com/new_mail
--- End Message ---
--- Begin Message ---
I was surfing along for information on E-tek motors and ran across this
battle bot site. Apparently there is a German company (PERM motor) that
builds motors comparable to Etek weight and size, but are rated for a lot
more power. Here are some of the specifications:
Perm Motor PMG 132 Specifications:
Voltage: 24-72 V
Weight: 24.8 lb
Angular-velocity constant: 50.2 rpm/V
Torque constant: 27 ozf.in/A
Terminal resistance: 0.025 Ohm
No-load current: 6A
Rotor Inertia: 1370 oz.in2
Inductance: 19 ?H
Continuous current: 110 A
10 minute current: 200 A
Terminals: 8 mm
48 V Performance
Peak efficiency: 86 %
Peak power:* 15.1 hp
No-load angular velocity:* 2380 r/min
Stall current:* 960A
Stall torque:* 25600 ozf.in
72 V Performance
Peak efficiency: 88.6 %
Peak power:* 34.3 hp
No-load angular velocity:* 3590 r/min
Stall current:* 1440 A
Stall torque:* 38500 ozf.in
Pretty detailed information in PDF format is available at
http://www.robotcombat.com/marketplace_motors_perm.html
Also look at the Perm Motor PMG 080...4hp from a 7.5lb motor.
Hopefully this isn't a repeat...anyways, it was the first I had seen of
these motors. I'm getting pretty interested in doing a motorcycle
conversion now.
Any thoughts?
Brett
--- End Message ---
--- Begin Message ---
Thanks Brett-
> Subject: Interesting motor?
Indeed---But at over 2x the cost of the ETEK, you gotta want that extra
size/weight/power.
Still good to know there's options and different scaled models like their
6.5# model---even that one is listed for more $$$ than the ETEK though.
Hopefully prices will get better as volume increases.
Thanks.
-MT
--- End Message ---
--- Begin Message ---
Hi All
Visited my favorite industrial junk dealer yesterday. As well as various
terminals, plugs, sockets, motor brushes, AC type contactors, 2 DC/DC
converters (20 to 60V in, 24V out) and other technical 'good junk' I got a
bunch of HRC fuses in the 100A to 250A range, and another DC motor. Last
trip there I got some 355A fuses, when I looked up the rupture curve for
them I realised that they are a bit much for my little Daihatsu (1000A for
10 seconds!) so I got some smaller ones.
The motor is a bit of a beast: 280mm (11 inches) diameter by 440mm (17
inches) long - 48V nameplate, unfortunately the output kW on the nameplate
is illegible. Pulled from the scrap bin, it has a cracked brush-end
housing. $50.00 Australian, around $36.00 US. It was a forklift traction
motor, but has a female output shaft. Apart from the cracked housing it
seems to be in very good condition.
Made by Hitachi, model number MT4100-11B, if anyone has a kW rating I'd be
grateful (web search brought no relevant hits). If anyone has any comments
on what a motor of this size should be capable of, I'd be interested to
hear them.
Regards
James Massey
Launceston, Tasmania, Australia.
--- End Message ---
--- Begin Message ---
Sorry if this seems off topic,
I'm looking for an old Washington license plate in good condition for
my EV buggy. Specifically, the plate I need is generally identifiable
as a "WASH 63" plate. I can find plenty of trashed ones but I need
one that is pretty clean. Of course there will be some attachment
marks and some unwanted tabs on it (I can get old tabs off with enuf
soaking time). I only need one plate, not the pair.
The WASH 63 plate is correct for 1963 and 1964 vehicles and WA allows
year of manufacture plate permanent registration for vehicles more
than 30 years old. My EV Buggy is a '64. Please let me know if you
can help! I'm tired of getting checked out by law enforcement just
because I'm not wearing seat belts (not required before 1965).
Thanx,
Neon
--- End Message ---
--- Begin Message ---
Markus Lorch wrote:
> idea mentioned about a zener diode and a light bulb... are there
> (affordable) zener diodes that could shunt a real charging current,
> i.e. 25A?
There are zeners this big, but they are usually called transient
absorbers.
However, you don't need zeners anywhere near the full charging current.
By the time a battery reaches "full", the charger should have already
backed off the charging current. So, the zener only needs to bypass the
charger's final charging current.
> would it be possible to use a zener and a high wattage resistor to
> limit the charge current to my batteries once the batteries reach
> 13.8-14V? It seems to me that in the worst case I have do dissipate
> 15V*25A per battery....thats 375Watt .. the largest zeners I find
> go up to 50W and they seem to be expensive.
Your ElecTrak charger is a constant-voltage transformer and rectifier.
Its charging algorithm produces 20-25a constant current bulk, and
14.6-15v per battery finish voltage. The bulk current is fine, but the
finish voltage is too high sealed batteries.
So, what you basically need to do is lower the finish voltage. There are
several ways to do this with a constant-voltage charger.
1. Increase the value of the AC capacitor. This is easy, but also
alters the charging current. For a small voltage change this is
acceptable.
2. Remove turns or tap down on the transformer secondary to lower
its voltage.
3. Add a separate autotransformer to drop the secondary voltage a
bit. This is easy if you can find such a transformer, but that
will be a challenge. It would need a 25amp winding with taps at
36v and 33v (to drop the voltage about 1v per 12v battery).
4. Add a few extra diodes in series with the charger output, to drop
the voltage. You'll need 25a diodes on a big heatsink!
--
"Never doubt that the work of a small group of thoughtful, committed
citizens can change the world. Indeed, it's the only thing that ever
has!" -- Margaret Mead
--
Lee A. Hart 814 8th Ave N Sartell MN 56377 leeahart_at_earthlink.net
--- End Message ---
--- Begin Message ---
Lee Hart wrote:
>> For example, the Curtis heatsink is 12" x 9" x 2" = 209 cu.in.
Patrick Maston wrote:
> So we get to count the void space between the fins of the heatsink
> as part of the volume needed?
Yes. It turns out that simple cubic volume is a good estimator for the
performance of a heatsink. Fin shape, style, color, thickness, etc. only
have a minor influence (assuming one doesn't get silly with them).
--
"Never doubt that the work of a small group of thoughtful, committed
citizens can change the world. Indeed, it's the only thing that ever
has!" -- Margaret Mead
--
Lee A. Hart 814 8th Ave N Sartell MN 56377 leeahart_at_earthlink.net
--- End Message ---
--- Begin Message ---
damon henry wrote:
> Since most of the regulators people discuss on this list are only
> used during charging, I am surprised that more people don't use
> these off the shelf low priced chargers as a means to finish
> charge each battery seperately.
This can work. However, most of these small cheap chargers have no
voltage regulation or temperature compensation. So you are simply
replacing a big dumb charger with lots of little dumb chargers.
If the small chargers are not very reliable, then you are also adding a
failure mode. If one small charger fails, you won't know it, and so wll
drive off with an undercharged battery.
--
"Never doubt that the work of a small group of thoughtful, committed
citizens can change the world. Indeed, it's the only thing that ever
has!" -- Margaret Mead
--
Lee A. Hart 814 8th Ave N Sartell MN 56377 leeahart_at_earthlink.net
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Mark Thomasson wrote:
> Question: The EVlist recommends monitoring AGM's individually
> while charging to prevent the imbalance problem. What about those
> six [2v] cells in each of the AGMs? What keeps them from going
> out of balance and destroying a battery prematurely?
Theoretically, battery manufacturers carefully test their cells, and put
a matched set of six in each 12v battery. Being identical, they will
stay in balance. Hah!
In reality of course, they only match them "good enough" to survive the
warranty period before causing problems. After that, they gradually go
downhill because you can't keep them in balance without at least a
little overcharging. So, flooded batteries have a longer life because
you can hold old ones in balance with overcharging.
--
"Never doubt that the work of a small group of thoughtful, committed
citizens can change the world. Indeed, it's the only thing that ever
has!" -- Margaret Mead
--
Lee A. Hart 814 8th Ave N Sartell MN 56377 leeahart_at_earthlink.net
--- End Message ---
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M.G. wrote:
> I thought heat sinks were rated in square inches of exposed surface.
You can rate them this way, but you'll find that their performance is
not very well predicted by surface area. It turns out that cubic inches
of heatsink (including the air spaces between the fins) is a better
predictor.
--
"Never doubt that the work of a small group of thoughtful, committed
citizens can change the world. Indeed, it's the only thing that ever
has!" -- Margaret Mead
--
Lee A. Hart 814 8th Ave N Sartell MN 56377 leeahart_at_earthlink.net
--- End Message ---
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Patrick Maston wrote:
>
> Would it be OK to mount an on-board charger in the passenger compartment
> to use its cooling air to preheat the interior? Would it work?
>
> Thanks,
>
> Patrick
> 1981 Jet Electrica
>
> Patrick Maston
> Division Chief, Special Operations
> Henderson Fire Department
> 240 Water Street
> Henderson, Nevada 89015
>
> Home: 702-210-4005
> Office: 702-267-2218.
> Fax: 702-267-2223
> Email: [EMAIL PROTECTED]
> Web: www.cityofhenderson.com
>
> Confidentiality Notice: This email message is for the sole use of the
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> contact the sender by replying to this e-mail and destroy/delete all
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Yes, it can be done and does (sort of) work. My own EV does this. The
problem is that chargers are pretty efficient (around 80%). So, there
isn't all that much heat, and it is spread out over a many-hour charging
cycle.
--
"Never doubt that the work of a small group of thoughtful, committed
citizens can change the world. Indeed, it's the only thing that ever
has!" -- Margaret Mead
--
Lee A. Hart 814 8th Ave N Sartell MN 56377 leeahart_at_earthlink.net
--- End Message ---
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I was reading the BMS wiki tonight and saw a banner ad for the Escape
Hybrid. The link is:
http://www.fordvehicles.com/escapehybrid/home/
Joe Smalley
Rural Kitsap County WA
Fiesta 48 volts
NEDRA 48 volt street conversion record holder
[EMAIL PROTECTED]
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