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Discussion Starter · #1 ·
Hi Folks

I am posting this on behalf of Roderick Wilde and the EV Parts crew.

After a long thrash and tow to get the EV Parts Land Rover from Port Townse=
nd WA to Sedona AZ for a Green Machines shoot, Roderick just called me from=
the trailhead with the news that his PFC-50 is non-op.

They have a partially discharged pack and hope to pull off todays filming b=
ut need to beg /borrow a charger that will work with a 168V pack (or 14 12v=
chargers) to charge for the next few days.

They are willing to drive a substantial distance overnight if needed to pul=
l this off and get a charger on the Rover.

If there are any EVDL folks that can help out with this, please email me OF=
F-LIST for contact info ASAP.

Thanks!


Roy LeMeur
NEDRA NW Regional Director
www.nedra.com
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Discussion Starter · #2 ·
Roy LeMeur wrote:
> I am posting this on behalf of Roderick Wilde and the EV Parts crew.
> After a long thrash and tow... his PFC-50 is non-op.

Ouch! My evil twin suggests:

The quick-and-dirty solution is to go to Radio Shack and get a big
bridge rectifier. Wire it from the 120vac line to the pack. It won't
fully charge the pack (because the peak of the 120vac line is only
170vdc), but will get half a charge into it until you can rig up
something bettery.

Slightly better: Can he get at the center tap of his 168v pack? If so,
tap it and bring out three wires; the center tap (0v), the positive end
(+84v), and the negative end (-84v). Connect neutral to the center tap.
Connect the 120vac hot wire to *both* AC input terminals of the bridge
rectifier. Connect the + of the bridge to the +84v end of the pack.
Connec the - of the bridge to the -84v end of the pack. Now you can
charge the pack at as much current as the AC outlet can provide. In
fact, it will try to charge a discharged pack at *too high* a current
and so trip the breaker! You'll need to limit the charging current with
several extension cords ('stench cords as Bob Rice would say :) to keep
it from blowing a breaker or fuse.

Slightly crazier: Make a resistor to limit charging current with a
bucket or large tin can of water with salt or something in it to make it
conductive. Connect the outside can to the neutral. Hang a big bolt or
smaller can inside by the wire to the pack's center tap. You can adjust
the charging current with the spacing between can and bolt. The water
will get hot and boil -- but it will also limit charging current, and
turn itself off when it runs out of water. :)
--
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

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Discussion Starter · #4 ·
Lee Hart wrote:
>
> Ouch! My evil twin suggests:
>

lol. your evil twin is funny and dangerous :)


--
Eduardo K. | Some say it's forgive and forget.
http://www.carfun.cl | I say forget about forgiving just accept.
http://ev.nn.cl | And get the hell out of town.
| Minnie Driver, Grosse Point Blank

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Discussion Starter · #5 ·
Lee Hart wrote:
>> My evil twin suggests...

From: Eduardo Kaftanski
> lol. your evil twin is funny and dangerous :)

Yes; he's the mad engineer I keep locked in the basement. He likes solving problems. But if there are no problems at hand, he will create some. :)
--
Pity Professor Oliver Quist
Who cured a disease that didn't exist
So he made the disease
Alas, for he sneezed
His cure didn't work; he'll be missed!

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Discussion Starter · #7 ·
storm connors wrote:
> I love the salt water resistor! With a small pump you could easily make it a
> variable resistor! I'm waiting for the safety brigade to get on your case
> for suggesting such unsafe, non code adhering procedures.

Yes, it's completely crazy... but it also works. :)

--
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

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Discussion Starter · #9 ·
>>> I love the salt water resistor!

Lee Hart wrote:
>> Yes, it's completely crazy... but it also works. :)

From: patrick DonEgan
> Let's see the video proof ;)

I don't have a camcorder; but I did actually do this 5 years or so ago. It does indeed work. I posted the results on the EV list at that time.

--
"Excellence does not require perfection." -- Henry James
--
Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart-at-earthlink.net

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Discussion Starter · #13 ·
Travis Gintz wrote:
> At my last job... 6 rectifiers that could supply 30,000 amps at 33KV.
> LOTS of power... we had to do a small load test... three 55 gallon
> drums, and filled them with water... Then they added salt until the
> desired load was achieved. It was a fun sight, but we had to be back
> about 30 feet for obvious reasons.

One extra warning for anyone who want to experiment.. Don't use salt if
you're going to run DC through the water/resistor. You will get
electrolysis at the plates, which releases HYDROGEN and CHLORINE gas!

It is far safer to run only AC through such a water/resistor. Then you
don't get electrolysis or release any flammable or toxic gases!

--
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

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Discussion Starter · #14 ·
At 08:50 25-10-07 -0700, Travis wrote:

>So they went to the shop, got three 55 gallon drums, and filled them
>with water. Then they got four 750mcm cables (2 for DC+ and 2 for DC-)
>and bolted them to aluminum plates and seperated them with some 4x4's
>to keep from shorting. Then they added salt....

At a computer centre i worked they load tested 1+ megawatt backup
generators this way. A dozen 44 imperial gallon drums in 3 groups. The
electrican would use a clamp on amp meter and add salt as required to
balance the phases. The clouds of steam made driving past the test almost
impossible. Later this evolved to a large (5000gallon?) stainless steel vat
with 3 separators and 3 large plates that could be lowered into the water.
No so dangerous and just as dramatic.

Justin

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