Chuck Hursch wrote:
>
> Rich,
>
> Your long post finally got me intrigued enough to go have a look
> at the manzanitamicro website. Don't get me wrong, I'm
> definitely interested in these chargers (plotting somewhat like
> Bruce, but not doing like Bruce (at least yet)), but have been in
> lurker mode on them. Basically, I have to finish doing the
> wiring job I put in place last year with the 6-ga cabling (pack
> poles are on opposite ends of the car, as 10-ga w/ 30A fuse is
> currently wired in from the VoltsRabbit kit). Also will have to
> put in an Avcon port in the Rabbit (looks like the best place
> will be behind the rear license plate, somewhat like the ol' GM
> gas cars). Etc. (including where to mount this big PFC-50
> charger, or maybe it will only come along for the longer runs).
Or like my Father's Oldsmobile 67 Cutlass 330 Rocket, Gas cap under
rear plate.
Remember the voltage really doesn't matter, as long as it's over 120
VAC. Of course you get more watts with more volts.
>
> Anyways, have had my ear to the rail a bit on your chargers. I
> was pleasantly surprised looking at your PFC-50 page (July 2002
> test) that a 100V pack will run the charger maxed out at about
> 50A DC into the pack, given 50A from a 120VAC line (ain't going
> to happen unless it's half of a 240V 14-50); or 80A DC in to the
> pack from 208VAC at 50A (don't know anything that will do that,
> but I can probably grab 30A AC from one of the Avcon paddles, so
> would have to back off); or a juicy 14-50 240VAC capable of
> running at 50A would likely get me close to 75A DC into the pack
> (although the DC curve in the graph disappears below 125VDC).
> All these assume the Buck Enhancer. Have people had better luck
> with the Buck Enhancer than the K&W booster (for packs over
> 108VDC on a 120VAC line), since many of the K&W boosters burnt up
> or otherwise failed, and is the Buck Enhancer a big monster?
> What kind of amps would I see without the Buck Enhancer (don't
> have a graph for that)?
The Stocker will make 50 amps or Suck 50 amps what ever comes first.
And it has some peculuarities. Pretty stout machine.
The PFC50 Buck enhancer is the same size box, it has a simple
additional current transformer,that is the buck enhancer. We dial the
whole power stage up to 75 amps and then reduce the input current to 50.
letting you suck only 50 amps while belting out 75 at lower voltages
than the input voltage.
Mentioning K&W and a PFC50 in the same breath is just about Swearing at
Joe and I's engineering!!!
Don't forget the PFCs will BOOST all by themselves. 120 VAC in will get
you 420 VDC out.
In effect the Buck enhancer lets you pull full line current from the
peak of 420 VDC down to where 75 amps of output is less than the 12Kw
that the input side is drawing. Typically about 166 to 140, Then it
should rail the output at 75 amps until you go below about 36 volts then
the over current safeties cut it back even more. So you get a lot more
watts into the Batteries for a much wider variety of battery packs.
> The colors were a little hard to differentiate on the PFC-50 Buck
> Enhancer graph, but once I dug into it, I was able to figure them
> out.
>
> If I can really get those kind of amps into my pack reliably,
> assuming charging infrastructure (and I do like to back off max a
> little to let the equipment live), this would really let me
> expand my EV travel range (can be out there EV'ing with Bruce).
> As I've done 90-120 mile days on two 120V chargers (Zivan K2 and
> K&W BC-20) paralleled together (about 27A into the pack), 200
> miles or more would be within reach with this PFC-50 setup
> (probably still a tired finish at midnight). I also know that
> the batteries get zippier the faster you charge them, liking to
> cruise at 60-70mph for quite some time even on a 96V pack.
The PFC20 chargers are not at thier peak efficientcy at this point..
there is a LOT of heat to be scrubbed off. The higher voltage the better
for watts from the wall to watts into the pack. Still it's going to be
in the high 80%, unless you drop below 48 volts.
Batteries getting Zipper... I'll Say I can over heat my Yellow tops in 4
cycles of 61 amps at the start of charge!! You know you are making some
charge amps when the 0/2 warms while you are charging!!! Yes I cleaned
that connection!
I have shots of the PFC50 metal. but I have not got them on the site, or
downloded them. I aughtta do that. Like right now....
Darn my mouse driver just left for GATES land... gotta reboot.
>
> Thanks,
> Chuck Hursch
> Larkspur, CA
> www.geocities.com/nbeaa
>
> ----- Original Message -----
> From: Rich Rudman <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Saturday, August 17, 2002 10:42 AM
> Subject: Re: A day with PFC chargers...(long)
>
> > In the "A Day with" line...
> >
> > A day at Manzanita ... a Few Evers have seen the Birthing Pit
> here, two
> > bay garage that has very little floor space left. Green Boxes
> stacked in
> > every corner at least 1/2 dozzen of them in some form of
> assembly.
> > Usually one or two on at time... doing something. Blocks of
> Black anti
> > static foam with PCBs partially stuffed of MK3(Sheer?... need
> parts!),
> [snip]
--
Rich Rudman
Manzanita Micro
www.manzanitamicro.com
1-360-297-7383,Cell 1-360-620-6266
