SPAM: RE: 600 VDC Switches [RE-wrenches]

[Nick Nicholas, APS]

As an attachment to my last posting.
    Hi wrenches:
As expected, 20 modules caused the inverter to de-rate.  The inverters were
located in an interior room inside the barn, and the space would get hot
during the afternoons.  With the addition of 4" fans on the heat sinks, we
were able to stop de-rating.
    We have found that 18- 165s with an SB-2500 is a cost effective,
efficient, reliable system.  The STC rating is 2.97 Kw, which is just lower
than the SB-2500 is capable of handling, but seems to be a good match.
    Sure, some other systems seem cleaner fits, but cost per watt is
relative to pricing and installation labor, and is a factor of more than
just inverter maximizing.
    I would be interested in hearing other wrenches favorite system
configurations.
Nick
Alternative Power Systems
www.alternativepowersystems.com
aps at sbcglobal.net
135 Colfax Ave.
Grass Valley, CA 95945
(530) 274-0588 phone
(530) 274-0589 fax
----- Original Message -----
From: "Nick Nicholas, APS" <APS at SBCGLOBAL.NET>
To: <RE-wrenches at topica.com>
Sent: Sunday, February 16, 2003 4:11 PM
Subject: Re: SPAM: RE: 600 VDC Switches [RE-wrenches]


> Hi Matt, Bill, and wrenches:
>     I have not seen any statistics that clearly show the inefficiency you
> describe between the 165 modules and the SB-2500.
>     I have been very happy with the system outputs  I've seen using 18-
165s
> and 1- SB-2500.
>     Last May we commissioned one system with 18 SAPC-165s on one SB-2500
> and 20 SAPC-165s on another.  We placed two arrays at 15 degrees on a
metal
> barn roof, located over the air conditioned engineers lab.  The system is
> here in Grass Valley, CA at 2000 ft elevation.  The system is monitored
with
> a Sunny Boy Control Plus, so we have some good output data.  In May, we
will
> have some annual statistics.
>     Some monthly, daily, and hourly statistics for last summer are
included
> on his web site www.rancholv.com.  Look at "solar", then "performance."
> or http://www.rancholv.com/solar/index.htm
>     The customer also monitors wind, rain, ambient air temperature, solar
> cell temperature, and solar insolation.  Thanks are due to John Berdner,
> SAPC, and the CEC for helping the customer acquire the monitoring system
and
> the two extra modules.
> Nick Nicholas
> Alternative Power Systems
> www.alternativepowersystems.com
> aps at sbcglobal.net
> 135 Colfax Ave.
> Grass Valley, CA 95945
> (530) 274-0588 phone
> (530) 274-0589 fax
> ----- Original Message -----
> From: "Matt Lafferty" <pvpro at attbi.com>
> To: <RE-wrenches at topica.com>
> Sent: Friday, February 14, 2003 10:46 AM
> Subject: RE: SPAM: RE: 600 VDC switches [RE-wrenches]
>
>
> > All:
> >
> > Brother Bill said:
> >
> > >Maybe this will encourage installers and module manufacturers to make
> > and specify an array that more appropriately >>matches the inverter?
> > (Instead of getting a great deal on a module and cramming it into the
> > inverter) Just a thought.
> >
> > >12-165s are fine on the SB1800 but the 165 and the SB2500 don't match
> > very well.
> >
> >
> > I WHOLEHEARTEDLY concur with Bill B's statement and philosophy!
> >
> > Based on the currently available inverters here, the 165 is a "poor
> > match" for grid-tied applications in terms of "cost per watt"
> > especially.
> >
> > There are other inverters "coming", but we must push for standardization
> > if we are to get the costs down.....Just a fact.
> >
> > Pray for Sun!
> >
> > Matt Lafferty
> > pvpro at attbi.com
> > (916) 422-9772
> > (916) 628-7694 Cell
> > (916) 914-2247 Fax
> >
>
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