2 Apr
2018
2 Apr
'18
12:55 a.m.
sweet, max!! i'd also suggest taking a gander at elektra's open hardware
mppt controller project <https://github.com/elektra42/freifunk-open-mppt>,
which she presented at last year's battlemesh
<https://www.youtube.com/watch?v=NLP4MxQp8kk> (juul is the one asking mad
questions at the end lol)
are you proposing a sudo mesh budget to build a prototype? if so, we can
put it on the agenda for an upcoming meeting.
thanks also to shaddhi for sharing your knowledge - glad you're on this
list! :)
<3
Jenny
Help open a professional kitchen at the Omni Commons in Oakland!
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`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`~`
"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
"Anything done for the first time unleashes a demon."
--Dave Sim, "Cerebus the Aardvark"
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On Sun, Apr 1, 2018 at 9:41 PM, Shaddi Hasan <shaddih(a)gmail.com> wrote:
I believe Nano M2's are ~6W. The data sheet lists
it as 5.5W, ubnt is
usually pretty accurate on power consumption for sizing off-grid systems in
my experience.
I recommend checking out http://wndw.net/ for guidance on sizing the
power system if you're looking for more info. Even if you're shooting for
20hrs/day of uptime, it's *generally* better to size for at least 2 days of
uptime w/o sunlight (effective hours of sunlight; cloudy and foggy days are
effectively zero sunlight days). The bay area is pretty easy 'cause we have
good weather but if you want 90% uptime for the year (which is low, in
practice) you'll want at least a day of backup.
Also consider getting a timer of some sort to shut the device off if you
don't need it active at night! That will really save on your power budget.
On Sun, Apr 1, 2018 at 9:01 PM, Max Schwartz <maxschwartziv(a)gmail.com>
wrote:
*I'm putting together a solar wi-fi repeater
for peoplesopen. Does
anyone have a number for average power consumption for the Ubiquiti
NanoStaton loco M2? Know of any cheaper/better components? *
*ItemCostSpecsBattery
<https://www.amazon.com/dp/B0010Z4MDK/ref=psdc_389574011_t1_B018IU1XSQ>$1712V,
5A, 60WCharge controller
<https://www.amazon.com/Y-SOLAR-Waterproof-Controller-Lead-acid-Discharging/dp/B00XTQ76WW/ref=sr_1_20?ie=UTF8&qid=1522631531&sr=8-20&keywords=solar+panel+with+charge+controller>$135A,
12V, 60W panel maxSolar Panel
<https://www.amazon.com/Polycrystalline-Solar-Panel-Module-Charging/dp/B01IFJ73X4/ref=sr_1_7?ie=UTF8&qid=1522634307&sr=8-7&keywords=20w+solar+panel>$3820W,
20.5”x14.4”Wifi Repeater
<https://www.amazon.com/dp/B00HXT8FFI/ref=psdc_1194486_t1_B00DCNRTAG>$45Datasheet
<https://drive.google.com/open?id=1DfxWDUMRfWqSYGr9rSBUCFbibCPe-0vB>, Sales
page <https://www.ubnt.com/airmax/nanostationm/>, 5.5W max power, Up to 24V
DC inputTotal Cost including tax and shipping(17+13+38+45)*(1.1)+10 =
$135Power AuditThe wifi repeater claims a “max power of 5.5W” I’m hoping
that average power requirements are less than this? Assumptions (24hr
period):3W continuous average power usage20 hour up time4 hours of direct
sunlight (source
<https://solarpowerrocks.com/solar-basics/how-much-electricity-does-a-solar-panel-produce/>)85%
charge efficiency (source
<https://www.solar-facts.com/batteries/battery-charging.php>)Power
generation:4hr * 20W * 0.85 = 68 WhPower consumption ?:3W * 20hr = 60Wh*
--
Max Schwartz
maxschwartziv(a)gmail.com
314-578-4503 <(314)%20578-4503>
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