Diversion charge control [RE-wrenches]
Jeff Clearwater, Ecovillage Design
clrwater at earthlink.net
Fri Sep 13 14:26:47 PDT 2002
<x-flowed>
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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--
~~~~~~~~~~~~~~~~~~~
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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