From: "oeva-list-request@..." <oeva-list-request@...>
To: oeva-list@...
Sent: Sun, October 11, 2009 12:00:03 PM
Subject: Oeva-list Digest, Vol 72, Issue 16
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Today's Topics:
1. Re: EV Batteries (Richard Hamje)
2. Lightly used Interstate 6V deep cycle batteries (Oliver)
3. Long Tailpipe (
patrick0101@...)
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Message: 1
Date: Sat, 10 Oct 2009 16:16:22 -0700
From: "Richard Hamje" <
richard@...>
Subject: Re: [Oeva-list] EV Batteries
To: <
oeva-list@...>
Message-ID: <
BAEA6A27E1DA4FDB9BB81EFC940F29F0@...>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
A local-ish source for the Thunder Sky batteries is
www.evcomponents.com They are in Lacey, WA and you can save money by picking the batteries up at
their warehouse. They carry three lines of LiFePO4, and several battery
management systems. I bought the batteries and BMS for my conversion from
them. It's taken more than two months for them to arrive - I'm supposed to
pick them up this week. These folks have the best prices I could find
anywhere. Be aware that they charge separately for the ocean shipping from
China, but it's still a
good deal.
I am using the 60AH batteries as I am more concerned with size and weight (I
need 90 of them for 288V) than range. If you are doing a 96 Volt
conversion, you'll only need 30 and could go with the 220AH if you really
want range. They make them in a variety of ratings.
The only other source for Thunder Sky that I could find was Jungle Motors in
San Diego, but their prices were 50% more.
Good luck!
Richard
----- Original Message -----
From: <
oeva-list-request@...>
To: <
oeva-list@...>
Sent: Saturday, October 10, 2009 12:00 PM
Subject: Oeva-list Digest, Vol 72, Issue 15
> Send Oeva-list mailing list submissions to
>
oeva-list@...>
> To subscribe or unsubscribe via the World Wide Web, visit
>
http://www.rdrop.com/mailman/listinfo/oeva-list> or, via email, send a message with subject or body 'help' to
>
oeva-list-request@...>
> You can reach the person managing the list at
>
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> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Oeva-list digest..."
>
>
> Today's Topics:
>
> 1. Ev Batteries (Rob Russo)
> 2. Re: Ev Batteries (Graunke, Gary)
>
>
>
----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 9 Oct 2009 18:45:20 -0700 (PDT)
> From: Rob Russo <
theboarddoctor@...>
> Subject: [Oeva-list] Ev Batteries
> To:
oeva-list@...> Message-ID: <
170760.80443.qm@...>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Thanks to all who responded.?
> I guess my main concern and?probably the first decision I have to make is
> the type and voltage of the battery pack.?I want to avoid lead acid
> batteries because it seems counterintuitive to add all
that weight to such
> a light vehicle.
> Is this battery pack practical for my application?:
> http://www.lifebatt.com/HPSpacks.asp?. Are there any alternative sources
> for this type of battery?
>
> Thanks,
> -Rob
>
>
>
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>
> Message: 2
> Date: Sat, 10 Oct 2009 09:46:37 -0700
> From: "Graunke, Gary" <
gary.graunke@...>
> Subject: Re: [Oeva-list] Ev Batteries
> To: Rob Russo <
theboarddoctor@...>, "
oeva-list@..."
> <
oeva-list@...>
> Cc: "Wallace, Paul" <
paul.wallace@...>
> Message-ID:
> <
9662F248D13E8C45B097A77F005E97293E00872D@...>
>
> Content-Type: text/plain; charset="us-ascii"
>
> Looking at the Sandia report, these batteries should be great in an EV. It
> doesn't answer the question of quality of manufacturing, but covers
> everything else.
> Our experience with A123's LiFePO4 was that 1-2% have a higher
> self-discharge rate, but they are
otherwise very consistent and meet and
> exceed specs in every way.
> These also meet or exceed specs in every way, according to the authors.
>
> To deal with these kind of variations, I would suggest the 12V 40AH to
> 80AH batteries (maybe even the 120AH if you have a pickup truck), so you
> have 4 to 12 cells in parallel.
> The 26 to 34 lb batteries are easy to life by hand if you need to work on
> them. The AH depends on your desired range and/or $ you have to invest.
>
> The low temperature performance is better than lead-acid as well, losing
> only 25% at freezing (about our low in Portland) or 34% if you live in
> Bend. The high power of the cells helps the low temperature performance,
> however, compared to lead, and you still can put in battery heaters or an
> insulated battery box if this is a concern. An insulated battery box would
> also help if
you have a catastrophic cell failure with 160C temperatures.
> (Always vent the box to the outside (not cabin) for this reason, though it
> is not critical).
> There is no high temperature concern (life with most other batteries!).
>
> Buying the batteries in this package makes it difficult (if not
> impractical) to do individual cell group management, but it sure is
> convenient! However, it may well be that monitoring the battery voltage
> at 12V will be good enough (that is what we are forced to do with lead
> acid batteries in any case). (The issue is that one should slow down/shut
> off the charger when a cell reaches maximum voltage to avoid overcharging
> it). The self-discharge rates on a cell mean that you may want to charge
> individual cells (or cell groups if they are in parallel) to keep them in
> balance. I do this manually right now every 10
months or so with A123
> cells, but will eventually put in equalizers to do this continuously.
>
> Bottom line-I would have used batteries like this in my Insight had they
> been available 3 years ago. Let us know how much they want for them.
>
> Other sources are thunder sky (though they have not met specs in their
> early offerings), peak battery (K2). I am running K2 batteries in my
> plug-in Prius from EEtrex-they have less (but still adequate) power than
> A123's, but 30% more energy per same size and weight cell.
>
> It is important to assess the quality of the batteries. It helps to know
> someone who has been using them, but this is difficult with new batteries.
> The Sandia report is very helpful in this regard, but there is always a
> concern that they "cherry-picked" the cells that they sent for testing
> (rather than a random sample from their
production).
>
> Keep us informed with your progress!
>
> Gary
>
> ________________________________
> From:
oeva-list-bounces@... [mailto:
oeva-list-bounces@...] On
> Behalf Of Rob Russo
> Sent: Friday, October 09, 2009 6:45 PM
> To:
oeva-list@...> Subject: [Oeva-list] Ev Batteries
>
> Thanks to all who responded.
> I guess my main concern and probably the first decision I have to make is
> the type and voltage of the battery pack. I want to avoid lead acid
> batteries because it seems counterintuitive to add all that weight to such
> a light vehicle.
> Is this battery pack
practical for my application?:
>
http://www.lifebatt.com/HPSpacks.asp . Are there any alternative sources
> for this type of battery?
>
> Thanks,
> -Rob
>
>
>
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>
> End of Oeva-list Digest, Vol 72, Issue 15
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>
------------------------------
Message: 2
Date: Sat, 10 Oct 2009 17:04:10 -0700
From: "Oliver" <
citicar@...>
Subject: [Oeva-list] Lightly used Interstate 6V deep cycle batteries
To: <
oeva-list@...>
Message-ID: <
A6E630A517BB47878C624BEDA5A14C1F@...>
Content-Type: text/plain; charset="us-ascii"
I was looking around for a couple 'lightly used' batteries to complete a
'6-pack' of T-105's for my 36V CitiCar, and just purchased the 2 from a this
ad: http://salem.craigslist.org/rvs/1401279881.html
He also has 2 Interstate batteries for sale. They tested fine and are
only
5-6 months old - $125 for the pair. Very reasonable person to deal with.
They were used in an RV that he has re-configured.
Cheers!
-Oliver
P.S. I have no personal interest in the above, just thought I would pass it
along.
------------------------------
Message: 3
Date: Sun, 11 Oct 2009 09:07:03 -0700
From:
patrick0101@...Subject: [Oeva-list] Long Tailpipe
To: OEVA <
oeva-list@...>
Message-ID:
<
8c28d7b50910110907n16cd3a58t3bf9b719e639784a@...>
Content-Type: text/plain;
charset="iso-8859-1"
EVs use electricity, so one of the arguments against them is that they move
pollution from the tailpipe to the smokestack and they encourage mountain
top removal... These have been debunked, EV pollute far less and there is
off-peak surplus generation that could power 40-60% of US cars. However,
rather than arguing the numbers, there is an even better solution.
If you live in Oregon and own a home, SolarCity is now offering solar
leases. You get solar panels on your house and pay exactly the same rate as
you are currently paying your utility for standard grid power. This is the
same deal (and from the same company) that Intel used when they put solar
panels on the Jones Farm 4 building.
http://celticsolar.blogspot.com/2009/10/solar-for-free.html
Regards,
Pat
With Great Power, Comes Great Current and High Voltage =D~
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