Kelly / Wrenches:
The voltages have shown some decline.
Post-stabilization OCV's are about 7% lower than "out of the box". The Asi
we have used is Double Junction (Two layers of amorphous), not the Single
Junction variety that created many of the stereotypes and fears 20 years
ago.
By the way, to answer Joel Davidson's question
about "apples for apples" STC DC kWH's.... I think that depends on where your
apples are...Orientation(s), Slopes, Climate, Non-Perfect Site Conditions
(partial shading etc.)... These are all things we are documenting.
Pray for Sun!
-Matt Lafferty
Kelly wrote:
Thanks for the info on single xl vs. amorphous.
You mentioned that the amorphous module voltages stabilized at around 15%
below the initial values. Where did the voltages stabilize in
relation to the nameplate ratings (+/-)?
Matt wrote:
I can tell you that we
have done "out of the box" and "installed for 6
months" and "installed
for 3 years" testing on a number of single crystal
modules....In general,
most met the spec sheet fine print stating "plus or
minus 10%"....Sorry
to say, none of them were "plus". Most results were
more like 7 -8%
below nameplate. No significant degradation over the time
periods
tested.
Our comparable testing of amorphous has shown sharp wattage
degradation in
the first 6 months then stabilized to about 15% max below
the "out of box"
initial IV curves. Post stabilization results have
been level. The
advantage to the amorphous has been that the "out
of the box" results have
been high enough above the nameplate ratings to
compensate for this.
We will have some Real World comparative data in
the not too distant future.
By this fall, I hope. Will be happy to
share when it's done.
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