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At 03:26 AM 12/26/2009, you wrote:<br>
<blockquote type=cite class=cite cite="">was brooks talking about the
plus line? I think not. I think that thread was regarding the Fronius
IG</blockquote><br>
The post is copied below. I would like to know it the problem
extends to the Plus line. <br><br>
<b>Bill Brooks</b>
<a href="mailto:re-wrenches%40lists.re-wrenches.org?Subject=Re%3A%20%5BRE-wrenches%5D%20Efficiency%20Curves%20of%20Fronius%20Inverters%3F&In-Reply-To=%3C00e301ca010e%24154b0b50%243fe121f0%24%40com%3E">
billbrooks7 at yahoo.com </a><br>
<i>Thu Jul 9 20:25:23 PDT 2009</i> <br><br>
<pre>All of the events I saw were similar to each other and different
from your
experience. What I saw was the inverter operating 40Volts above Max
Power
Point (MPP) (it was at 330V when it should have been at 290V). This
caused
the inverter to operate at 90% of what a properly operating inverter
would
produce. After cycling the inverter off and back on, most went to the
proper
MPP, but some went back to the wrong voltage. The consistency is uncanny
and
not encouraging. It looks like they have a software problem. It's likely
other inverter companies have similar problems, but to catch a problem
after
so little investigation is depressing.
We really need a solid MPP tracking test to catch these issues before
they
go out broadly into the field. Everybody likes to talk about inverter
efficiency. What is the efficiency of a 95% efficient inverter producing
90%
of available power. Effectively it is 0.95 x 0.90 = 0.855. Nobody would
ever
buy an inverter with an 85.5% efficiency, but apparently it happens
regularly.
Bill.
</pre><blockquote type=cite class=cite cite="">
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