SPAM: Re: PV orientation [RE-wrenches]

[Bill Brooks]

Max,

I think the idea of keeping a circulating fan in that closet is the best
idea. Make sure that the closet is the same temperature as the rest of the
air conditioned house. The SunnyBoy runs a little less efficiently at the
higher voltages you are operating at, so removing the heat will allow it to
operate at full power. Not removing the heat will cause it to limit output
to stay cooler.

Sounds like a good system and your crew discovered that efficiency of the
array is dependent on operating temperature. That's why the airspace under
the modules is so important.

Bill.


-----Original Message-----
From: Max Balchowsky [mailto:max at seesolar.com]
Sent: Thursday, August 22, 2002 9:11 PM
To: RE-wrenches at topica.com
Subject: SPAM: Re: PV orientation [RE-wrenches]


I have just installed a 7.2 kilowatt system in Palm Desert. 3 SMA 2500's,
with 24 AP 100's in series string config. with ea inverter - same basic
orientations ( 8 degree tilt to the south ) how ever there are slight
differences due to some shading at different times of the day and slightly
different angles to the roof ( flat, almost,  with a parapet). we were
careful to keep each string at the same orientation, however each string is
slightly different from the other in orientation. I have not gathered data
yet, we only turned it on yesterday, however one thing that concerns me in
the desert is the summer heat and system efficiences. I have been quoting
and laying out systems with the inverters in the airconditioned space of a
bedroom closet, storage closet or hallway. This is our first install here
and the 3 inverters and DC disconnects are in the large closet in the guest
bedroom ( under the largest roof area covered with panels). One thing I did
notice is that when I sent one of the crew to wash off the panels with the
hose, the output increased a good 10 to 12 percent. it was 105 degrees out
side and the heat of the panels made a big difference......I know that the
inverters will function better with out the heat, allthough I think the SMA
will handle heat better than most. I will be monitoring the system over the
next few weeks, One thing I like about the Sunline system are the monitors
that come with it, they show me the amount being produced by the system, the
amount being provided by the grid, both totals and current rate ......

Max
See Systems
100 S. Sunrise wy
Palm Springs, Ca. 92262

760.403.6810


----- Original Message -----
From: "Joe Schwartz, Home Power" <joe.schwartz at homepower.com>
To: <RE-wrenches at topica.com>
Sent: Thursday, August 22, 2002 8:17 AM
Subject: PV orientation [RE-wrenches]


> Hey all,
>
> I'm looking for real world data on PV orientation vs. KWH production.
>  From what I've seen, much of the current orientation advice
> (especially on-grid) is based on F-Chart simulations.
>
> Have any of you collected KWH output data for systems with arrays in
> multiple orientations at a particular site? And if you have, how
> closely does the data correspond to simulation programs, i.e. F-Chart?
>
> To keep it simple, I'd to limit the scope of this question to systems
> with an array/inverter in any given orientation (not arrays with
> different orientations feeding a single inverter). I'd also like to
> ignore orientation considerations that may be based on economics,
> like TOU metering. I'm just after KWH output data vs. orientation.
>
> Thanks,
>
> Joe
> --
>
> Joe Schwartz - CEO and Technical Editor
> Home Power magazine
> joe.schwartz at homepower.com
> www.homepower.com
>
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