[RE-wrenches] Sanyo Semi-facial

[Bill Brooks]

Doug,

That is why I made the comment that their panels tend to be underrated (a
good and rare thing). One of the reasons is due to the article that Joel
posted a link to earlier (the Japanese govt. hammered them for overrating).
The product has not been on the market (or even in existence) long enough to
know whether or not it has a major drop off in power down the road. However,
it is a large, reputable company, so the risk of buying their product is
dramatically less than many other new-style technologies coming to the
market. If their product fails, you are likely to be taken care of. That is
a lot more than you can say for the majority of newcomers to our industry.

Bill.


-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Doug Wells
Sent: Tuesday, April 14, 2009 5:58 PM
To: RE-wrenches at lists.re-wrenches.org
Subject: Re: [RE-wrenches] Sanyo Bi-facial

Bill,

I am not going to go off about Sanyo modules, especially the bifacial  
brand.  However I will say this.
I have installed a lot of residential systems with their panels.  I  
installed a system at a retired engineers home last summer and he is  
keeping very close records of production.  We are commonly seeing  
production which is at or above nameplate rating ON THE AC SIDE.  A  
3.6 kW array is producing 3400 to 4,000 watts AC on cold sunny days.   
This is not the norm in PV production in my opinion.
This brings up 2 questions for me
	1.  Why the hell are very intelligent engineers overloading
inverters  
with DC production.  I know the easy answer is Nameplate DC rating for  
incentive programs.
	2.  Is the multi-junction Amorphous approach all pumped up the first

5 years and then going to let go in year 18?

Thoughts experience?  Can't deny the early production in VT.

Doug Wells
The Solar Specialists
Morrisville, VT 05661
(p) 802-223-7014
(c) 802-498-5856
www.thesolarspecialists.com