Re: power factor correction capacitors (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 02 Jul 2007 11:02:42 -0500
From: Andrew Nettles <anettles@xxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: power factor correction capacitors (fwd)

As mentioned before, surplus city liquidators is cheap.  I just ordered 
several run caps similar to those eBay ones for about $4 a piece.  You have 
to call them to be set up as a customer - don't bother emailing them.  I 
emailed them twice and they didn't respond, but once I called them 
everything was ok.  The caps I got were brand new and two of them were 
slightly different in dimensions (about 1/4" taller) than the others but 
were otherwise identical.

Andrew
Ft. Worth


>From: "Tesla list" <tesla@xxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: Re: power factor correction capacitors (fwd)
>Date: Mon, 2 Jul 2007 06:46:26 -0600 (MDT)
>
>
>---------- Forwarded message ----------
>Date: Mon, 02 Jul 2007 12:32:13 +0000
>From: David Rieben <drieben@xxxxxxxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Cc: drieben@xxxxxxxxxxx
>Subject: Re: power factor correction capacitors (fwd)
>
>Hi Scott,
>
>Check this out:
>
>http://cgi.ebay.com/New-100UF-100-UF-RUN-OIL-CAPACITORS-CAPACITOR-370V_W0QQitemZ170124898221QQihZ007QQcategoryZ4662QQrdZ1QQcmdZViewItem
>
>These make excellent PFC caps and have a realtively high capacitance
>so that you would only need 3 of them to achieve your desired 295 uFd
>(you'd actually exceed it by 5 uFd, which is close enough). Also, their 370
>VAC rating allows them to be used with either 120 or 240 volts without
>worry of overvolting them. I have personally purchased these capacitors
>before and they are a great capactior for the money.
>
>David Rieben
>
>-------------- Original message --------------
>From: "Tesla list" <tesla@xxxxxxxxxx>
>
> >
> > ---------- Forwarded message ----------
> > Date: Sun, 01 Jul 2007 21:57:59 -0400
> > From: Scott Bogard
> > To: tesla@xxxxxxxxxx
> > Subject: Re: power factor correction capacitors (fwd)
> >
> > Considering that I don't get to the junkyard everyday (sadly), and since 
>DC
> > capacitors are relatively cheap for their voltage/capacitance rating, 
>could
> > I use two parallel strings of DC caps, each protected by a diode to keep 
>the
> > power flowing the right way, or would this not work (or if I grounded 
>the
> > strings)? For my power supply, Java TC is suggesting I need a 295 uf cap
> > size, and considering how low the values of motor run capacitors 
>generally
> > are, I would need a whole lot of them! Thanks.
> > Scott Bogard.
> >
> >
> > >From: "Tesla list"
> > >To: tesla@xxxxxxxxxx
> > >Subject: Re: power factor correction capacitors (fwd)
> > >Date: Sun, 1 Jul 2007 17:25:04 -0600 (MDT)
> > >
> > >
> > >---------- Forwarded message ----------
> > >Date: Sun, 01 Jul 2007 12:33:25 -0400
> > >From: David Speck
> > >To: Tesla list
> > >Subject: Re: power factor correction capacitors (fwd)
> > >
> > >Scott,
> > >
> > >IMHO, it's not worth it to try to build a PFC cap. You can get metal
> > >can (oval or round) oil filled motor run caps for free from dead air
> > >conditioners, refrigerators, some furnaces, or dehumidifiers at your
> > >local recycling center. Usually, the bigger the original device, the
> > >bigger the cap. They are also available from eBay. Even microwave oven
> > >caps work, but at only 1 uF each, you would need several in parallel.
> > >Motor run caps will have a definite capacitance value, like 6 uF at 
>some
> > >voltage, stamped into the case.
> > >
> > >Do not use round black plastic encased electrolytic motor start caps --
> > >they are intended for a duty cycle of only a few seconds, and get hot
> > >and explode if run continuously. Start caps usually have a very wide
> > >range of capacitance printed on the case, like 50 - 120 uF at some
> > >voltage.
> > >
> > >Dave
> > > > Hey everybody,
> > > > Can anybody tell me where I can get, some capacitors to use for
> > >power
> > > > factor correction (and how much it would cost me)? Would it be 
>insanely
> > > > difficult to build one? Could I use motor start or run capacitors?
> > >Thanks.
> > >
> > >
> > >
> >
> > _________________________________________________________________
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>
>