Inverter Shoot-Out continues [RE-wrenches]

[Bill Brooks]

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Anthony and Don,

I certainly agree with Anthony's points and Don's data is interesting and
helpful in some respects. The biggest issue with data is providing a
baseline reference point. Irradiance and temperature measurements are
critical to determine whether performance is good or bad. Without that data,
the relative importance that can be placed on the data is substantially
reduced. Satellite data is definitely a possibility, but it currently takes
some effort to compare real data to real performance.

Anthony's initial data request was very specific and required location,
orientation, shading, and annual energy production numbers--I think this is
the correct approach for this type of data.

Recently a post talked about poor performance on a system, but it had no
irradiation data to compare with the performance. From the very limited data
provided, it appeared to me that the system could be operating just fine. It
also could be way off and the only way to know is with irradiation data to
compare it.

One thing I would really like to see from system manfucturers is an
irradiance input to the inverter so the inverter can calculate the
Performance Index and provide the system owner and installer/service person
with good feedback as to how the system is working.

Anthony, you should be commended for requesting this data? I hope Wrench
will begin to provide you with the data you requested. You might want to
resend your original data request for those that may not have it.

Bill.

-----Original Message-----
From: Don Loweburg, Offline [mailto:i2p at aol.com]
Sent: Tuesday, March 30, 2004 10:15 AM
To: RE-wrenches at topica.com
Subject: Re: Inverter Shoot-Out continues [RE-wrenches]

In a message dated 3/30/2004 9:03:32 AM Pacific Standard Time,
tony at appliedsolarenergy.com writes:
Only Joel responded.  Is he the only one who has collected data, or is there
no interest in real world performance?


Real world from central Calif:


2.5 kw cec rated and  Sunny boy 2.5 inverter

March 25 readings

Fixed array 12.5 kwh
Tracked array 16.4 kwh  both measurements taken at 4:40 am

These two systems are not side by side but very similiar in all respects


The fixed system comes very close to the simple estimate of .7 times STC
(3kw
here)

The tracked system yields about a third more energy (kwh per day). A
production incentive would be of benefit here.

I have lots of systems that I monitor causually. I believe my results
(mainly
SB inverters and Kyocera modules) represent pretty good sample . However
these ancedotal results lack the rigor being discussed by others.

best,Don

[Non-text portions of this message have been removed]

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