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Discussion Starter #1
Somewhere in my browsing I saw a "Wide Range" DC-DC converter that's big
claim to fame was that if you changed your pack voltage you wouldn't need to
change your DC-DC converter because of the wide range of input voltages it
would take and still provide full power.

Has anyone else seen that Converter? Where was it? Anyone using it?



Bob Sisson
1993 Geo Metro Convertible Project
Gaithersburg MD


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Discussion Starter #2
belktronics.com

Joseph H. Strubhar

Web: www.gremcoinc.com

E-mail: [email protected]



----- Original Message -----
From: "Bob Sisson" <[email protected]>
To: "'Electric Vehicle Discussion List'" <[email protected]>
Sent: Thursday, September 16, 2010 5:58 AM
Subject: [EVDL] Wide range DC-DC converter?


> Somewhere in my browsing I saw a "Wide Range" DC-DC converter that's big
> claim to fame was that if you changed your pack voltage you wouldn't need
> to
> change your DC-DC converter because of the wide range of input voltages it
> would take and still provide full power.
>
> Has anyone else seen that Converter? Where was it? Anyone using it?
>
>
>
> Bob Sisson
> 1993 Geo Metro Convertible Project
> Gaithersburg MD
>
>
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Discussion Starter #3
You may be thinking of the Belktronix unit:

<http://www.belktronix.com/isodcdc.html>

Except it now seems like he's gone to a narrow voltage range customized to your pack.


--
Doug Weathers
http://www.gdunge.com
Dedicated to the creation of a spacefaring civilization


"Bob Sisson" <[email protected]> wrote:

> Somewhere in my browsing I saw a "Wide Range" DC-DC converter that's big
> claim to fame was that if you changed your pack voltage you wouldn't need to
> change your DC-DC converter because of the wide range of input voltages it
> would take and still provide full power.
>
> Has anyone else seen that Converter? Where was it? Anyone using it?
>
>
>
> Bob Sisson
> 1993 Geo Metro Convertible Project
> Gaithersburg MD
>
>
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Discussion Starter #4
Bob, this isn't likely to be the one you reference, but it's a possible source.
I am considering converting my 48v Gizmo to LiFePO4 in the future, and
increasing the voltage in the process. I've learned from this list that the
controller I hope to purchase will handle voltage in the 70s and I've just
discovered that my existing DC/DC converter will go as high as 75v. That's good
news for exactly the reason you specify.

It's a Sure Power Industries DC/DC converter, one of many products they
manufacture: http://www.surepower.com/products.html and the e-brochures link
will give you models and specs for a wide range of devices.

It's raining today and we need the water, but it sure interferes with EV
trouble-shooting!
-----------------------------------------------
Original Message: 5

From: "Bob Sisson" <[email protected]>
Subject: [EVDL] Wide range DC-DC converter?

Somewhere in my browsing I saw a "Wide Range" DC-DC converter that's big
claim to fame was that if you changed your pack voltage you wouldn't need to
change your DC-DC converter because of the wide range of input voltages it
would take and still provide full power.

Has anyone else seen that Converter? Where was it? Anyone using it?



Bob Sisson
1993 Geo Metro Convertible Project
Gaithersburg MD
End of Original message: 5
-----------------------------------------------




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Discussion Starter #5
He does build custom ones to suit the pack, which makes more sense anyway
than a broad range one (less expensive for the smaller packs).

Joseph H. Strubhar

Web: www.gremcoinc.com

E-mail: [email protected]



----- Original Message -----
From: "Doug Weathers" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Thursday, September 16, 2010 6:17 AM
Subject: Re: [EVDL] Wide range DC-DC converter?


> You may be thinking of the Belktronix unit:
>
> <http://www.belktronix.com/isodcdc.html>
>
> Except it now seems like he's gone to a narrow voltage range customized to
> your pack.
>
>
> --
> Doug Weathers
> http://www.gdunge.com
> Dedicated to the creation of a spacefaring civilization
>
>
>
"Bob Sisson" <[email protected]> wrote:
>
>> Somewhere in my browsing I saw a "Wide Range" DC-DC converter that's big
>> claim to fame was that if you changed your pack voltage you wouldn't need
>> to
>> change your DC-DC converter because of the wide range of input voltages
>> it
>> would take and still provide full power.
>>
>> Has anyone else seen that Converter? Where was it? Anyone using it?
>>
>>
>>
>> Bob Sisson
>> 1993 Geo Metro Convertible Project
>> Gaithersburg MD
>>
>>
>> -------------- next part --------------
>> An HTML attachment was scrubbed...
>> URL:
>> http://lists.sjsu.edu/mailman/private/ev/attachments/20100916/a6f93898/attachment.html
>> _______________________________________________
>> | REPLYING: address your message to [email protected] only.
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>
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Discussion Starter #6
The issue is to make the car affordable; I need to start at a lower voltage.
My controller will go from 48V to 144V...

The car is a Geo Metro CONVERTIBLE... so I have limited room for Batteries
and even less weight capacity. Trying to put 800#'s of lead into a 1500#
convertible makes no sense...

So I will start with 96V of LifePo4 and add a cell every other month for a
while... with 2,000 cycles, the difference between 1999 cycles and 1950
won't be very big, especially if I don't go to 80%...

So..thats why I need a wide range converter....

Bob Sisson
1993 Geo Metro Convertible Project
Gaithersburg MD

-----Original Message-----
From: x[email protected] [mailto:[email protected]] On Behalf
Of joe
Sent: Friday, September 17, 2010 9:20 AM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Wide range DC-DC converter?

He does build custom ones to suit the pack, which makes more sense anyway
than a broad range one (less expensive for the smaller packs).

Joseph H. Strubhar

Web: www.gremcoinc.com

E-mail: [email protected]



----- Original Message -----
From: "Doug Weathers" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Thursday, September 16, 2010 6:17 AM
Subject: Re: [EVDL] Wide range DC-DC converter?


> You may be thinking of the Belktronix unit:
>
> <http://www.belktronix.com/isodcdc.html>
>
> Except it now seems like he's gone to a narrow voltage range customized to

> your pack.
>
>
> --
> Doug Weathers
> http://www.gdunge.com
> Dedicated to the creation of a spacefaring civilization
>
>
>
"Bob Sisson" <[email protected]> wrote:
>
>> Somewhere in my browsing I saw a "Wide Range" DC-DC converter that's big
>> claim to fame was that if you changed your pack voltage you wouldn't need

>> to
>> change your DC-DC converter because of the wide range of input voltages
>> it
>> would take and still provide full power.
>>
>> Has anyone else seen that Converter? Where was it? Anyone using it?
>>
>>
>>
>> Bob Sisson
>> 1993 Geo Metro Convertible Project
>> Gaithersburg MD
>>
>>
>> -------------- next part --------------
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>>
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hment.html
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>
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Discussion Starter #7
On 17 Sep 2010 at 10:48, Bob Sisson wrote:

> Trying to put 800#'s of lead into a 1500# convertible makes no sense..

Have courage! ;-) That's exactly what converters have been doing for
decades. With lead batteries, one-third of the vehicle's weight in
batteries is about the minimum for achieving practical range (around 40
miles or so).

For example, in the 1980s probably several dozen 1500lb early Honda Civics
(1974-78 or so) were converted with 96 volt golf car battery packs weighing
about 1000lb. I had one. Driving it felt kind of like riding a bicycle
with 50 lb in your backpack, and it really needed a brake upgrade. It was
otherwise OK.

Of course, finding space for the batteries is another matter, especially in
a convertible. Carrying a couple in your lap really isn't a very good
option. ;-)

David Roden - Akron, Ohio, USA
EVDL Administrator

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Discussion Starter #8
Actually, on lead-acid the common weight distribution for a decent range
is indeed about 1/3 of the converted car weight is the pack.... See the
EV Album.
(I am not saying that you must do ti or that it is even possible in your
convertible,
but it certainly makes sense to most conversions...

Regards,

Cor van de Water
Director HW & Systems Architecture Group
Proxim Wireless Corporation http://www.proxim.com
Email: [email protected] Private: http://www.cvandewater.com
Skype: cor_van_de_water IM: [email protected]
Tel: +1 408 383 7626 VoIP: +31 20 3987567 FWD# 25925
Tel: +91 (040)23117400 x203 XoIP: +31877841130

-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Bob Sisson
Sent: Friday, September 17, 2010 8:18 PM
To: 'Electric Vehicle Discussion List'
Subject: Re: [EVDL] Wide range DC-DC converter?

The issue is to make the car affordable; I need to start at a lower
voltage.
My controller will go from 48V to 144V...

The car is a Geo Metro CONVERTIBLE... so I have limited room for
Batteries and even less weight capacity. Trying to put 800#'s of lead
into a 1500# convertible makes no sense...

So I will start with 96V of LifePo4 and add a cell every other month for
a while... with 2,000 cycles, the difference between 1999 cycles and
1950 won't be very big, especially if I don't go to 80%...

So..thats why I need a wide range converter....

Bob Sisson
1993 Geo Metro Convertible Project
Gaithersburg MD

-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of joe
Sent: Friday, September 17, 2010 9:20 AM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Wide range DC-DC converter?

He does build custom ones to suit the pack, which makes more sense
anyway than a broad range one (less expensive for the smaller packs).

Joseph H. Strubhar

Web: www.gremcoinc.com

E-mail: [email protected]



----- Original Message -----
From: "Doug Weathers" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Thursday, September 16, 2010 6:17 AM
Subject: Re: [EVDL] Wide range DC-DC converter?


> You may be thinking of the Belktronix unit:
>
> <http://www.belktronix.com/isodcdc.html>
>
> Except it now seems like he's gone to a narrow voltage range
customized to

> your pack.
>
>
> --
> Doug Weathers
> http://www.gdunge.com
> Dedicated to the creation of a spacefaring civilization
>
>
> On Sep 16, 2010, at 6:58 AM, "Bob Sisson" <[email protected]>
wrote:
>
>> Somewhere in my browsing I saw a "Wide Range" DC-DC converter that's
big
>> claim to fame was that if you changed your pack voltage you wouldn't
need

>> to
>> change your DC-DC converter because of the wide range of input
voltages
>> it
>> would take and still provide full power.
>>
>> Has anyone else seen that Converter? Where was it? Anyone using it?
>>
>>
>>
>> Bob Sisson
>> 1993 Geo Metro Convertible Project
>> Gaithersburg MD
>>
>>
>> -------------- next part --------------
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>>
http://lists.sjsu.edu/mailman/private/ev/attachments/20100916/a6f93898/a
ttac
hment.html
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>
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Discussion Starter #9
What Current do you need?

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Bob Sisson
Sent: Saturday, 18 September 2010 2:48 a.m.
To: 'Electric Vehicle Discussion List'
Subject: Re: [EVDL] Wide range DC-DC converter?

The issue is to make the car affordable; I need to start at a lower voltage.
My controller will go from 48V to 144V...

The car is a Geo Metro CONVERTIBLE... so I have limited room for Batteries
and even less weight capacity. Trying to put 800#'s of lead into a 1500#
convertible makes no sense...

So I will start with 96V of LifePo4 and add a cell every other month for a
while... with 2,000 cycles, the difference between 1999 cycles and 1950
won't be very big, especially if I don't go to 80%...

So..thats why I need a wide range converter....


_______________________________________________
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