Diversion charge control [RE-wrenches]

[Steve Willey, Backwoods Solar]

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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