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<div class="moz-cite-prefix">I'd be interested in this. I spent a
couple weeks doing research for an inverter here:<br>
<a class="moz-txt-link-freetext" href="http://opensourceecology.org/wiki/Universal_Power_Supply">http://opensourceecology.org/wiki/Universal_Power_Supply</a><br>
<br>
That design was a bit more daunting, but this seems like a doable
challenge.<br>
<br>
When would you like to start?<br>
<br>
On 07/22/2014 04:24 PM, Phil Wolff wrote:<br>
</div>
<blockquote
cite="mid:CANER2ShP-OuaCLKrv9qzAjuZ0gEzW3uhkbnLHt0n=JgyddLoKA@mail.gmail.com"
type="cite">
<div dir="ltr"><a moz-do-not-send="true"
href="https://www.littleboxchallenge.com/">https://www.littleboxchallenge.com/</a>
is offering $1,000,000 to the team that designs and builds the
smallest inverter. Is there a sudoer contingent interested in
forming a team to explore the barriers to making inverters
smaller?<br>
<br>
<br>
<blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px
solid rgb(204,204,204);padding-left:1ex" class="gmail_quote">
<h2>What the inverter needs to do</h2>
<p>The winning inverter will be the one that achieves the
highest power density and meeting a list of other
specifications, as determined by a panel of judges, while
undergoing testing for 100 hours.</p>
<p>In brief, the other specifications are :</p>
<ul>
<li>Must be able to handle up to 2 kVA loads</li>
<li>Must achieve a power density of equal to or greater than
50 W/in<sup>3</sup></li>
<li>Must be able to handle loads with power factors from
0.7–1, leading and lagging in an islanded mode</li>
<li>Must be in a rectangular metal enclosure of no more than
40 in<sup>3</sup></li>
<li>Will be taking in 450 V DC power in series with a 10 Ω
resistor</li>
<li>Must output 240 V, 60 Hz AC single phase power</li>
<li>Must have a total harmonic distortion + noise on both
voltage and current of < 5%</li>
<li>Must have an input ripple current of < 20%</li>
<li>Must have an input ripple voltage of < 3%</li>
<li>Must have a DC-AC efficiency of greater than 95%</li>
<li>Must maintain a temperature of no more than 60°C during
operation everywhere on the outside of the device that can
be touched.</li>
<li>Must conform to Electromagnetic Compliance standards as
set out in FCC Part 15 B</li>
<li>Can not use any external source of cooling (e.g. water)
other than air</li>
<li>Does not require galvanic isolation</li>
</ul>
<p>Our testing philosophy is to not look inside the box. You
provide us with a box that has 5 wires coming out of it: two
DC inputs, two AC outputs and grounding connection and we
only monitor what goes into and comes out of those wires,
along with the temperature of the outside of your box, over
the course of 100 hours of testing. The inverter will be
operating in an islanded more—that is, not tied or synced to
an external grid. The loads will be dynamically changing
throughout the course of the testing, similar to what you
may expect to see in a residential setting.</p>
</blockquote>
<br>
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<br>
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</blockquote>
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