irradiance meters [RE-wrenches]

[Bill Brooks]

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Geoff,

I'm thinking about this winter in Northern California (Sacramento-to-Bay
area).

If you have a spare module that you know is good, use it as your reference.
Isc should be proportional to irradiance within 3-5%. It is as accurate as a
handheld meter.

Bill.


-----Original Message-----
From: Geoff Greenfield [mailto:Geoff at Third-Sun.Com]
Sent: Thursday, October 21, 2004 1:13 PM
To: RE-wrenches at topica.com
Subject: RE:irradiance meters [RE-wrenches]




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Bill - your course sounds like a great excuse to visit the left coast...
try and schedule it in the winter/slow period... (slower period? or just as
busy but with frozen finger tips period)

Matt- the Fronius has an irradiance option (along with other gizmos and a
weather suite) - we did a full on fronius install and found the unit to be
way off... until we calibrated the software with the multiplier on the back
of the sensor... but since I STILL don't have the handheld meter I keep
seeing advertised in solar today, I don't know how accurate it is.  I
suspect that it is pretty rough... but it fits the educational goal of that
project (as does the module temp sensor).  It is pretty much a tiny cell...
and after the math is probably the most expensive cost/watt solar
installation we have ever done!

Sincerely,

Geoff Greenfield
NABCEP Certified Solar PV Installer TM
GLREA Certified Photovoltaic Systems Integrator/Installer License Number
0211-01

THIRD SUN SOLAR AND WIND POWER Ltd.
340 West State Street, Unit 25
Athens, OH 45701

Phone (740) 597-3111
Fax   (740) 597-1548

www.third-sun.com

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