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Just because you can doesn't mean you should. I might do this as an
experiment but never involving others. The education level of
different hams in understanding electricity is evident at every club
meeting and field day I have been to. There are "extra"class
licensees who passed a written test but are clueless about practical
circuits as there are "technician"class ops who could write a book
on it. I have a friend who holds a master electricians license and
called me to install an outlet for him. He is a awesome test taker
but a screwdriver in his hand is a dangerous weapon. I am not
bemoaning the training levels but as a safety issue I find myself
strongly against this idea. Steve KB1CHU<br>
<br>
<br>
<div class="moz-cite-prefix">On 6/11/2015 10:12 AM, Robert Bruninga
via aprssig wrote:<br>
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<p class="MsoNormal">Eventually we should get to a
fossil-fuel-free fieldday. It is easy to avoid that
stink-pot-foul smelling-polluting-noisey generator by just
running some small conductor wire to every car parked at
Fieldday. Parallel them all and without drawing more than
100W from each car, you can provide over a kW throughout
fieldday just from batteries.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Just plug in 100W cigarette lighter
inverters into each car, add two caps and two diodes to double
the 60 Hz 120v up to 330 VDC and distribute that to all the
operating positions. Then just plug in standard SWITCHING
power supplies wherever needed to the 330VDC and get all the
12v AMPS you need at each site.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">By upconverting to 330 VDC there are
several advantages:</p>
<p class="MsoListParagraph" style=""><span style="">1)<span
style="font:7.0pt "Times New Roman""> </span></span>Distribution
wire size is only 1% of what it would need to be at 12v and
only 10% of what it would be at 120v</p>
<p class="MsoListParagraph" style=""><span style="">2)<span
style="font:7.0pt "Times New Roman""> </span></span>You
can deliver over 1 kW via simple #18 zip cord over hundreds of
feet and still only draw 3 amps, well below the rating of the
wire.</p>
<p class="MsoListParagraph" style=""><span style="">3)<span
style="font:7.0pt "Times New Roman""> </span></span>You
can parallel as many cars as you like at 330 VDC for
distributed energy</p>
<p class="MsoListParagraph" style=""><span style="">4)<span
style="font:7.0pt "Times New Roman""> </span></span>10
solar panels in series can provide 330 VDC at 7 amps (over 2
kW) </p>
<p class="MsoListParagraph" style=""><span style="">5)<span
style="font:7.0pt "Times New Roman""> </span></span>Or
you can put microinverters ($125) on each solar panel to
gernerate the 120vac (into 330VDC) for distributed power</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">The disadvantage is re-educating ham
operators about high voltage DC safety.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">After field day and crises at work, I hope
to come up with a general idea and concept, and connectors,
and safety features to make this a come-as-you-are way to make
emergency field power not just for fielday but for everyday
as-needed use.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Remember, every HYBRID comes to Field Day
with a few kWh of energy already at high voltage, and every
electric car comes with 10 to 20 kWh of energy. But the
easiest place to tap in, is still, the cigarette lighter at
12v and then upconvert to 330 VDC for distribution and then
down convert back to 12v for universal usage at the station…
</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I have done that over 3000’ using nothing
but one #24 wire and Ground. See <a moz-do-not-send="true"
href="http://aprs.org/aprs-swer.html">http://aprs.org/aprs-swer.html</a>
</p>
<p class="MsoNormal">But for Fieldday distances, better to avoid
the ground loop and simply run two-conductor zip cord or other
convenient wire.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">If you don’t understand HV DC, then ignore
this and stay away. Remember even 8 year old cub scouts when
I was a kid built HV Tube radios as a standard requirement
with open wiring on mom’s spare breadboard… and none died…</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Bob, Wb4APR</p>
<p class="MsoNormal"> </p>
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