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
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/in3
> - 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 in3
> - Will be taking in 450 V DC power in series with a 10 Ω 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
> - 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.
Awesomeness: Thanks David K, David ?, Jeremy, and Sally for your help.
That was a lot of stuff!!
The area got 96% cleared up. We moved the 2 Two Posts Racks, and the
improvised server cart holding three two Servers and a Dell Desktop.
If someone could clear up the rest of the stuff would super! What is
left? A black big cabinet, and miscellaneous stuff left on and around
p.s. staged-photo ;) hehe
Just we all know:
We have received a donation of 2 Two Post Racks. Thanks Chris!! The
donation easily saved us about 400 dollars. We only needed one for
production, but Jeremy and I already have discussed how we can use the
second one (training for those who would like to learn how to reset
passwords, erase config files, and or do OS upgrade on the spare Cisco
Switches that we have. :) -Oh yeah... we couldn't wait and installed a
couple of switches on one of the racks! :)
SCREWS AND CAGE NUTS:
Anyhow: for those that know how messy can get with having the wrong kind
of screws and cage nuts: We have narrow it down to have the donated
racks tread as a model to use for the Server Rack square holes. So when
we trying to install a switch or rack mount server/device we won't go
bunkers trying to figure out what screws should be use. The screws we
are using are 12-24.
SERVER RACK STATUS:
And talking about the Server Rack.... Last Friday I checked with the
Vendor and I am glad I did.
There was some wrong info in the billing part of the order, it did get
corrected then. So now that detail got cleared up, the estimate shipping
date is August 16. Yes, until then since this is a back-order.
In the morning at&t was at the omni, they were chopping the tree across
the street and preparing the phone line for sonic. They eventually
installed two panels with lines going to the landlord and us. The line
to us was marked as *sonic cir 319* and *sonic cir 320*, but nothing was
Then we wired it and... we have internet!
SERVER ROOM UPDATE JULY 21, 2014
We finally concluded that the small stage that oversees the Sudoroom is
where we'll put the Server Room. Yes, the area behind the SudoRoom sign.
This particular area is full of wood and other stuff that needs to move,
so if you feel helping on this part of Sudo Reboot, please do.
If you have any questions or need more info on how to help please check
with Marc, David, Daniel, or Jeremy.
I know I'm probably being an idiot, but looking at all the floor plans and
detail drawings, for the life of me I cannot figure out the building or
room heights.. ie for sudo/ccl room, ballroom, etc.
Can some enterprising engineeringly-minded soul help us figure that out as
what are sudoer's thoughts on scissor lifts, rental vs. purchase..?
---------- Forwarded message ----------
From: David Keenan <dkeenan44(a)gmail.com>
Date: Mon, Jul 21, 2014 at 1:19 AM
Subject: scissor lifts
To: "omnilogistics(a)lists.riseup.net" <omnilogistics(a)lists.riseup.net>
Hi all.. um -
Thinking about all we have to do and talking with contractors -
I think we will either have to rent or, maybe, purchase a used scissor lift
for all we have to do.
Looks we can rent for ~400-$700/mo, or buy one for ~$4500-$6000.
Advantage of buying one use is obviously, we keep it as long as we need and
when we are done (if nothing breaks) we just sell it for about what we
bought it for, which will be cheaper than renting.
We have these 'get up high' tasks - some necessary, some potentially
- Ceiling tiles: these are falling off/down, some water damaged - fix,
remove or replace
- Soundproofing (as per a studio engineer I took through the place):
Pexiglass or similar under the skylights, and some sort of
closeable/openable cover for the 2 large pull fans (ie large openings from
which most of the sound escapes into the neighborhood). This will be
necessary for any future cabaret license.. and we need to start renting
- Ceiling tiles & florescents: remove
- New ceiling lighting & eletrical conduit: install
- Pull fans to install in skylight vents
- peeling paint & superficial damage to fix in ceiling (as per CCL's need
- Siding on south wall: fix up and/or or replace damaged / rotting boards
before rainy season (Landlord may pay for some of this)
Potentially necessary everywhere:
- SPRINKLERS aaaaaaahhhhh - this will make it far less expensive / scary an
investment. If we bought a used lift, we could start installing it room by
room and take our time.
- Fixing any elctrical, gas or plumbing pipe high up that is hard to reach
An added possible benefit marc brought up - if we kept it - this would aid
greatly in Mesh installs around oakland.. maybe mesh could help out with
the purchase, and it could be taken on field trips..? Mesh - what say you..?
Extension 1 for sales, tech is Keshon - if anyone needs to communicate with
They were let in finally by John thank goodness - It would still be good if
someone was there - the tech needs to try to improve the bandwidth. If
someone could roll over and assist the tech, that would be good?
- I did confirm that at least on paper we are connected to the close C.O.
(~1.1K ft away), so we should be getting close to the provisioned bandwidth
of 100Mb down / 20Mb up, instead of 20/1.5 as we are currently getting
- Tech should be told to try the Tace 5168 Sonic is providing so our Zyxel
modem is not blamed / the culprit
- Sonic's Tace modem should be hooked up right at the MPOE (in the utility
room) to remove any variables possibly related to faulty inside wiring
- Tech should probably be told to look for undocumented bridge taps (i.e.
at the nearest b-box outside) to see what may be dragging down the bandwidth
On Sun, Jul 20, 2014 at 11:28 AM, Jenny Ryan <tunabananas(a)gmail.com> wrote:
> An extension would be helpful! I can be there in ten.
> "Technology is the campfire around which we tell our stories."
> -Laurie Anderson
> "Storytelling reveals meaning without committing the error of defining it."
> -Hannah Arendt
> "To define is to kill. To suggest is to create."
> -Stéphane Mallarmé
> On Sun, Jul 20, 2014 at 11:24 AM, David Keenan <dkeenan44(a)gmail.com>
>> Call Sonic at 707-522-1000 if someone can get there in 10min
>> sudo-discuss mailing list