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Today's Topics:
1. Re: Proper care and feeding of lead acid (TiM M)
2. Re: [ElectricMotorcycles] Inspection Woes (Mark Eidson)
3. Re: Proper care and feeding of lead acid
(Dewey, Jody R ATC COMNAVAIRLANT, N422G5G)
----------------------------------------------------------------------
Message: 1
Date: Mon, 27 Aug 2007 11:35:19 -0700 (PDT)
From: TiM M <[EMAIL PROTECTED]>
Subject: Re: [EVDL] Proper care and feeding of lead acid
To: [EMAIL PROTECTED]
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=utf-8
Thanks for the input. I don't have any balancing
on the pack. I equalized once a month or so and added
water about the same. To equalize I would rest the PFC
after it had timed out. Towards the end when I was
trying to keep the pack going I did some long low
current charges. The pack started finishing at higher
and higher currents to reach the finishing voltage. I
had to lower the final voltage to keep the finishing
current from being too high. Cells started going on
various batteries. I replaced one, two weeks later I
replaced a second a week after that I jumpered a third
one that went bad, a week later a 4th went belly up. I
called it quits and ordered a replacement.
The typical cycle is between 35 and 65 mph for 9
miles followed by a 7 mile return at 35 but almost
uphill all the way.
TiM
PS I've noticed for probably 6 months or more the EVDL
digests don't always arrive in order. Sometimes I'll
go a day or two before the missing digests show up.
They always do show up, just not in the order that
they should. I'm using Yahoo mail.
__________________________________________________
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------------------------------
Message: 2
Date: Mon, 27 Aug 2007 11:34:55 -0700
From: "Mark Eidson" <[EMAIL PROTECTED]>
Subject: Re: [EVDL] [ElectricMotorcycles] Inspection Woes
To: [EMAIL PROTECTED]
Message-ID:
<[EMAIL PROTECTED]>
Content-Type: text/plain; charset=UTF-8
Well now that I am on the road and have captured some data you are
exactly correct. Top speed is about 50 MPH at 3350 RPM. I get 68
WH/M from the Zilla data for an 18 mile test ride. I figure about 88
WH/M from battery data. me
On 8/1/07, Roger Stockton <[EMAIL PROTECTED]> wrote:
>
> My gut feel is that you're geared to spin the motor too fast and at 72V
> it is going to go to sleep on you before you get to top speed. Looking
> at the cold peformance curves for the L91-4003 at 75V on EV Parts, at
> 5000RPM the motor is drawing only 80A and develops about 8HP; 13HP is
> available at about 4000RPM, and this is right near peak efficiency for
> the motor (at this voltage). But 4000RPM with your present gearing is
> about 52MPH. Since 13HP is a fair bit greater than the 7.5HP predicted
> to maintain 50MPH, you'll probably accelerate OK up to this speed but
> struggle to get much faster, even on flat ground in still air, and will
> not reach 60mph with the present gearing.
>
> Once you've got it on the road you'll have a better idea how it
> performs, but my guess is that you'll want to re-gear for perhaps
> 4500RPM @70mph if you want to be able to reach 60mph.
>
> The present gearing has your motor pretty near peak efficiency at the
> max speed of your typical commute (45mph), but the efficiency drops off
> much faster if you spin the motor faster than if you load it down and
> spin it a bit slower.
>
> Cheers,
>
> Roger.
>
>
------------------------------
Message: 3
Date: Mon, 27 Aug 2007 14:43:12 -0400
From: "Dewey, Jody R ATC COMNAVAIRLANT, N422G5G" <[EMAIL PROTECTED]>
Subject: Re: [EVDL] Proper care and feeding of lead acid
To: "Electric Vehicle Discussion List" <ev@lists.sjsu.edu>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset="us-ascii"
You might want to invest in a battery balancer for your new pack. I
would also recommend individual equalization. Just putting the PFC on
for a long time is not equalizing your pack since some batteries will
cook to bring the others up to snuff. Without equalization you end up
cooking the good batteries for the sake of the not so good ones.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of TiM M
Sent: Monday, August 27, 2007 14:35
To: [EMAIL PROTECTED]
Subject: Re: [EVDL] Proper care and feeding of lead acid
Thanks for the input. I don't have any balancing on the pack. I
equalized once a month or so and added water about the same. To equalize
I would rest the PFC after it had timed out. Towards the end when I was
trying to keep the pack going I did some long low current charges. The
pack started finishing at higher and higher currents to reach the
finishing voltage. I had to lower the final voltage to keep the
finishing current from being too high. Cells started going on various
batteries. I replaced one, two weeks later I replaced a second a week
after that I jumpered a third one that went bad, a week later a 4th went
belly up. I called it quits and ordered a replacement.
The typical cycle is between 35 and 65 mph for 9 miles followed by
a 7 mile return at 35 but almost uphill all the way.
TiM
PS I've noticed for probably 6 months or more the EVDL digests don't
always arrive in order. Sometimes I'll go a day or two before the
missing digests show up.
They always do show up, just not in the order that they should. I'm
using Yahoo mail.
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
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End of EV Digest, Vol 1, Issue 80
*********************************
