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Discussion Starter #1
Hi All,
I am looking for a trick to get my pack voltage up to "empty". I've got a 300v pack in a US Electricar that is sitting at 240v but needs to be at ~260v before the charger will kick in. Is there some kind of cheap 300v power supply that I can find for this one time use? I don't mind if it takes 48 hours, I just don't want to build or buy a charger that I am only going to use once, and I don't want to remove the bed and all of the cabling to charge these batteries one at a time with a 12v charger.
Is there something I can find at radio shack or inside an old television that will do this job?
Thanks
Carl Clifford

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Discussion Starter #2
Where are you located?

- Steven Ciciora
Superior, CO


--- Carl Clifford <[email protected]> wrote:

>
>
> Hi All,
> I am looking for a trick to get my pack voltage up
> to "empty". I've got a 300v pack in a US Electricar
> that is sitting at 240v but needs to be at ~260v
> before the charger will kick in. Is there some kind
> of cheap 300v power supply that I can find for this
> one time use? I don't mind if it takes 48 hours, I
> just don't want to build or buy a charger that I am
> only going to use once, and I don't want to remove
> the bed and all of the cabling to charge these
> batteries one at a time with a 12v charger.
> Is there something I can find at radio shack or
> inside an old television that will do this job?
> Thanks
> Carl Clifford
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>




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Discussion Starter #3
Hmmmm...

Doesn't the US Electricar truck have an AC drive system capable of regen?

Do you have a way to pull it?

Good luck.

--
Stay Charged!
Hump
I-5, Blossvale NY



>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On
> Behalf Of Carl Clifford
> Sent: Friday, September 14, 2007 3:42 PM
> To: [email protected]
> Subject: [EVDL] just a sip
>
>
>
> Hi All,
> I am looking for a trick to get my pack voltage up to "empty". I've got
> a 300v pack in a US Electricar that is sitting at 240v but needs to be
> at ~260v before the charger will kick in. Is there some kind of cheap
> 300v power supply that I can find for this one time use? I don't mind
> if it takes 48 hours, I just don't want to build or buy a charger that I
> am only going to use once, and I don't want to remove the bed and all of
> the cabling to charge these batteries one at a time with a 12v charger.
> Is there something I can find at radio shack or inside an old television
> that will do this job?
> Thanks
> Carl Clifford
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev


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Discussion Starter #5
I'd use a 120v variac and an isolated 1:1 transformer. Put the 1:1 on
the output of the variac.
Put the output of the variac and the output of the 1:1 transformer
through their own bridge rectifiers and the pulse DC output of the
rectifiers in series. This would result in a 0 to 360v (+-20v) very
dangerous power supply.

An alternative would be a 1:2 step-up transformer and a fan speed
control .. though this is more risky IMO.

Either way it's dangerous and you shouldn't do it ;-)
--
Martin K

Carl Clifford wrote:
>
> Hi All,
> I am looking for a trick to get my pack voltage up to "empty". I've got a 300v pack in a US Electricar that is sitting at 240v but needs to be at ~260v before the charger will kick in. Is there some kind of cheap 300v power supply that I can find for this one time use? I don't mind if it takes 48 hours, I just don't want to build or buy a charger that I am only going to use once, and I don't want to remove the bed and all of the cabling to charge these batteries one at a time with a 12v charger.
> Is there something I can find at radio shack or inside an old television that will do this job?
> Thanks
> Carl Clifford
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>
>

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Discussion Starter #7
Carl Clifford wrote:

> I've got a 300v pack in a US Electricar that is sitting
> at 240v but needs to be at ~260v before the charger will
> kick in.

> Is there something I can find at radio shack or inside an
> old television that will do this job?

If you have a 240V outlet available to use, then you can build a simple
charger for this. Use a bridge rectifier with suitable ratings (e.g.
400 or 600V PIV and 20 or 30A is fine) to rectify the AC line and then
wire an ordinary household light socket in series with the output. If
desired, you can connect mutiple light sockets in parallel. Install a
120V 100W bulb in the socket to limit the charge current. Installing a
larger wattage bulb or multiple bulbs in parallel will increase the
charge current.

If you have only a 120V outlet to charge from, then wire up a voltage
doubler in place of the bridge rectifier as explained on the page below
and then use the same light bulb scheme to limit the charge current.

<http://www.play-hookey.com/ac_theory/ps_v_multipliers.html>

Neither of these approaches are isolated from the AC line, so exercise
caution and bond the vehicle chassis to the AC outlet's earth
connection.

If you are new to EVs or aren't comfortable working with these sorts of
voltages, then take advantage of assistance from any reasonably local
EVers that you can. Free food and/or drink can be more than enough
encouragement for an EVer to spend an evening or day on the weekend
lending a hand ;^>

Cheers,

Roger.

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Discussion Starter #8
Re: [EVDL] Just a sip

I'm in Arvada - Arbor Lake, right down the street from you.
>Where are you located? >>- Steven Ciciora >Superior, CO
Yeah that's probably true, but I would like to confirm that this controller works before I sink money into batteries. Just want to get a little grin!
>>If the batteries are that low, I wonder if they are even worth trying >>to recharge.... they might take a little charge, but it's doubtable >>that they'd ever return to near their design capacity... your time >>might be better spent finding new batteries for it?
>>Z
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Discussion Starter #10
You shouldn't have to disconnect any wiring. You could probably hit each battery for 10-20 minutes or so (or even less) with a 12V automotive charger. That might get a few of them up enough to make up your 10V deficit.

At an average of 9.6V each though your prospects might be pretty slim.

Mike,
Anchorage, Ak.

----- Original Message -----
From: Carl Clifford <[email protected]>
Date: Friday, September 14, 2007 11:43 am
Subject: [EVDL] just a sip
To: [email protected]

>
>
> Hi All,
> I am looking for a trick to get my pack voltage up to "empty".
> I've got a 300v pack in a US Electricar that is sitting at 240v but
> needs to be at ~260v before the charger will kick in. Is there
> some kind of cheap 300v power supply that I can find for this one
> time use? I don't mind if it takes 48 hours, I just don't want to
> build or buy a charger that I am only going to use once, and I
> don't want to remove the bed and all of the cabling to charge these
> batteries one at a time with a 12v charger.
> Is there something I can find at radio shack or inside an old
> television that will do this job?
> Thanks
> Carl Clifford
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>

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Discussion Starter #11
Re: [EVDL] Just a sip

Yes, that makes sense. Even if they only have 5 miles range... you
can make sure everything else works properly.

Z


> Yeah that's probably true, but I would like to confirm that this controller works before I sink money into batteries. Just want to get a little grin!

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Discussion Starter #12
Carl,

If you can easily / safely break into the battery pack wiring and wire
in another two twelve volt batteries (or four - 6 volters) you will be
at your voltage to start charging, and can remove the extras once the
pack takes a little charge. You mentioned in a later reply that some or
all of the pack may be marginal or bad, so extra batteries on hand may
be usable.

Someone mentioned that you could charge each battery separately with a
12 volt charger (6 volt?) if you can access enough of the batteries.
This may be slow, but if you can find some 12 volt DC wall wart
transformers and put clips on the ends, you can leave one on a battery
overnight and it should be back up in voltage the next day. If you have
several DC transformers in your junk drawer, this may work. Maybe not
in 48 hours though.

Alan


-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Carl Clifford
Sent: Friday, September 14, 2007 12:42 PM
To: [email protected]
Subject: [EVDL] just a sip



Hi All,
I am looking for a trick to get my pack voltage up to "empty". I've got
a 300v pack in a US Electricar that is sitting at 240v but needs to be
at ~260v before the charger will kick in. Is there some kind of cheap
300v power supply that I can find for this one time use? I don't mind
if it takes 48 hours, I just don't want to build or buy a charger that I
am only going to use once, and I don't want to remove the bed and all of
the cabling to charge these batteries one at a time with a 12v charger.
Is there something I can find at radio shack or inside an old television
that will do this job?
Thanks
Carl Clifford

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For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev

_______________________________________________
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Discussion Starter #13
Re: [EVDL] Just a sip

O.K., I've got a PFC-30 charger that should do the
trick, and at this point, (10) 2 amp 12V chargers, if
you wanted to charge up a battery one at a time. I
could have more of the 12V chargers with a little bit
of soldering.

What is your schedule this weekend? While I have way
more things I need to get done than I have time, it's
_always_ good to get another EV on the road...

- Steven Ciciora

P.S. What kind of outlets do you have? I've got cord
adapters for NEMA 14-50, standard 120VAC outlets, and
can pretty much easily make up whatever else we need.
I just haven't needed anything else. I also got some
long 6 gauge extension cords.


--- Carl Clifford <[email protected]> wrote:

>
>
> I'm in Arvada - Arbor Lake, right down the street
> from you.
> >Where are you located? >>- Steven Ciciora
> >Superior, CO
> Yeah that's probably true, but I would like to
> confirm that this controller works before I sink
> money into batteries. Just want to get a little
> grin!
> >>If the batteries are that low, I wonder if they
> are even worth trying >>to recharge.... they might
> take a little charge, but it's doubtable >>that
> they'd ever return to near their design capacity...
> your time >>might be better spent finding new
> batteries for it?
> >>Z
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>




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