22 Jul
2014
22 Jul
'14
5:06 p.m.
I'd be interested in this. I spent a couple weeks doing research for an
inverter here:
http://opensourceecology.org/wiki/Universal_Power_Supply
That design was a bit more daunting, but this seems like a doable challenge.
When would you like to start?
On 07/22/2014 04:24 PM, Phil Wolff wrote:
https://www.littleboxchallenge.com/ 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?
What the inverter needs to do
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.
In brief, the other specifications are :
* Must be able to handle up to 2 kVA loads
* Must achieve a power density of equal to or greater than 50
W/in^3
* Must be able to handle loads with power factors from 0.7--1,
leading and lagging in an islanded mode
* Must be in a rectangular metal enclosure of no more than 40 in^3
* Will be taking in 450 V DC power in series with a 10 ? resistor
* Must output 240 V, 60 Hz AC single phase power
* Must have a total harmonic distortion + noise on both voltage
and current of < 5%
* Must have an input ripple current of < 20%
* Must have an input ripple voltage of < 3%
* Must have a DC-AC efficiency of greater than 95%
* Must maintain a temperature of no more than 60°C during
operation everywhere on the outside of the device that can be
touched.
* Must conform to Electromagnetic Compliance standards as set
out in FCC Part 15 B
* Can not use any external source of cooling (e.g. water) other
than air
* Does not require galvanic isolation
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.
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