Diversion charge control [RE-wrenches]

Fri Sep 13 20:47:44 PDT 2002

Well, no, not 4 control units. It will, just have 2 units anyway. Just
toying with one carrying 80% of load as series solar, the other carrying
balance as diversion to handle the small seasonal hydro and overflow solar.
Not true back-up that way. Or could make two diversion controls and shut off
auto-equalize and balance them with at least fairly close settings
Steve Willey       steve at backwoodssolar.com

----- Original Message -----
From: "Jeff Clearwater, Ecovillage Design" <clrwater at earthlink.net>
To: <RE-wrenches at topica.com>
Sent: Friday, September 13, 2002 2:26 PM
Subject: Re: Diversion charge control [RE-wrenches]

> Hi Steve,
>
> Why not use an Enermaxer that's rated at 60 amps @ 48 Volts.  They do
> buzz (audibly and well as electrical noise) but they are robust and
> simple.  Equalization is manual is only drawback.  The backup unit
> you can just set at a little higher voltage and it won't interfere.
>
> That way you'ld have 2 units instead of 4! if you need parallel and
> redundancy at that amperage.
>
> Jeff Clearwater
> Ecovillage Design
>
>
> >I understand the code is requiring diversion type charge controls to be
> >redundant as back-up for safety in case a dump load burns-out.I am
currently
> >specifying a system that will need TWO Trace C-40 controls because
combined
> >PV and seasonal hydro will total about 51 amps at 48 volts. (48 volts
means
> >C-60 cannot be used).
> >
> >While I have used C-40 in solar series control mode side by side for two
30
> >amp arrays, I have concerns bout their function as diversion.  In series,
> >when one drops to float mode, the other can carry on just fine, holding
> >until it also reaches requirements for going to float. The other control
and
> >array may till hold battery voltage up at bulk  They can even equalize
> >automatically at different times if their portion of the charge source is
so
> >capable.
> >
> >However, set up as a diversion control, when one goes to float mode it
will
> >probably pull the battery down so that the other never will go to float.
> >Automatic equalization would never happen so long as one control might be
> >pulling for float while the other tries to equalize.  Any experience in
> >setting these up and how they work together or not? One option being
> >considered is one control as diversion and most of the solar processed
> >series through the other. But part of the problem may remain where the
> >diversion unit can pull everything toward float voltage, taking most of
the
> >load most of the time.
> >
> >Steve Willey       steve at backwoodssolar.com
> >www.backwoodssolar.com
> >Backwoods Solar Electric Systems
> >Home electricity from sunlight for
> >locations with no utility lines.
> >Free instructional catalog.
> >----- Original Message -----
> >From: "Bill Brooks" <billb at endecon.com>
> >To: <RE-wrenches at topica.com>
> >Sent: Thursday, September 12, 2002 9:53 AM
> >Subject: RE: SPAM: Data missing from SP140 cut sheet [RE-wrenches]
> >
> >
> >>  William,
> >>
> >>  Here is the information you seek. I share your frustration. Many
companies
> >>  are poor about providing basic information like this.
> >>
> >>  Model Vmp Imp Voc Isc
> >>  SP140-24P 33 4.25 42.8 4.7
> >>  SP150-24P 33 4.4 43.4 4.8
> >>
> >>  Bill.
> >>
> >>
> >>  -----Original Message-----
> >>  From: William Miller [mailto:wrmiller at slonet.org]
> >>  Sent: Wednesday, September 11, 2002 9:29 PM
> >>  To: solarinfo at si.shell.com
> >>  Cc: RE-wrenches at topica.com
> >>  Subject: SPAM: Data missing from SP140 cut sheet [RE-wrenches]
> >>
> >>
> >>  Dear Sirs or Ms:
> >>
> >>  I just downloaded the 2 page cut sheets for the Shell SP140 and SP150
PV
> >>  modules.  There is at least one item of data glaringly absent:  The
rated
> >>  output current.  This was listed for all Siemens products but has
> >>  apparently been left out of the documents redone by Shell.  The
documents
> >>  in question are:  ShellSolarSP140_UKv5.pdf and
ShellSolarSP150_UKv5.pdf.
> >>  For an example of a correct document, please see the Siemens cut sheet
for
> >>  the SP150.  It does contain the rated amperage.
> >>
> >>  I must emphasize that designers and field installers must have access
to
> >>  published data in order to file complete design documents and building
> >>  permit applications.  This is an important part of manufacturers
support.
> >>
> >>  Please correct the documents cited and e-mail them to me at this
e-mail
> >>  address at your earliest convenience.  Thank you in advance for your
> >>  assistance.
> >>
> >>  Sincerely,
> >>
> >>
> >>  William Miller
> >>
> >>  PS:  If I may, I'd also like to suggest that these documents contain a
> >>  minimum of color for ease in printing in standard office color
printers.
> >>  We need to print multiple copies of these cut sheets and it really
> >consumes
> >>  a lot of color ink if the sheets are too busy with color.
> >  >
> >>  Thanks,
> >>
> >>  WM
> >>
> >>  __________________________________________________________________
> >>  William Miller
> >>  Miller Power and Communications
> >>  PO Box 50, Santa Margarita, CA 93453
> >>  Voice :805-438-5600 Fax: 805-438-4607 VMail: 805-546-4875
> >>  email: wrmiller at slonet.org
> >>  http://millerpowerandcomm.com
> >>  License No. C-10-773985
> >>  _____________________________________________________________
> >>  Compatibility:
> >>  Word processor: WP7
> >>  Spreadsheet: Quatro Pro 7
> >>  CAD: Microstation 95, DXF, Visio 4.1T
> >>  _____________________________________________________________
> >>  "Every decent man is ashamed of the government he lives under."
> >>                                      H. L. Mencken
> >>  __________________________________________________________________
> >>
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> >>
> >>
> >>
> >>
> >
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> >
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>
> --
> ~~~~~~~~~~~~~~~~~~~
> Jeff Clearwater
> Ecovillage Design Associates
> Home, Community and Village Scale Renewable Energy Systems
>
> 2525 Arapahoe Ave, Suite E4, #280
> Boulder, CO 80302
> 1-800-440-2523 PIN7071
> Fax:  720-528-7813
> clrwater at earthlink.net
> jeffc at ic.org
>
> Council Member - Ecovillage Network of the Americas -
http://www.ecovillage.org
> Founder:  Ecovillage Research, Development, and Demonstration Program:
> http://www.home.earthlink.net/~clrwater/RDD/rdd.html
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
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> To send a message: RE-wrenches at topica.com
>
> Archive of previous messages: http://www.topica.com/lists/RE-wrenches/
>
> List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm
>
> Check out participant bios: www.mrsharkey.com/wrenches/index.html
>
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>
> Moderator: michael.welch at homepower.com
>
>
>

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