Reluctantly agree.<br><br>No offense intended, but the idea of avoiding tried-and-true reliable conventional generator power seems ... I dunno, eccentric? What's really wrong with a regular generator? Again, no offense intended, but the stated objections to a proper generator (stinky, noisy, etc) are subjective in the context of the situation. All those car batteries have to be charged by an internal combustion engine anyway. Just set up a proper generator. If a particular individual does not like the concept of a generator, then that person could run his or her own individual equipment from solar, wind, or other niche boutique forms of energy. But wiring up a parking lot full of cars just seems a little ... Rube Goldberg.<br><br>My two cents.<br><br>Jeff<br>N5TEV<br><br>-----Original Message-----<br><br><br><br>Kenneth Finnegan via aprssig <aprssig@tapr.org> wrote:<br><br><p dir="ltr">No.</p>
<p dir="ltr">If anyone shows up to my field day operations and starts trying to run 300VDC across the parking lot using indoor lamp cord, they are immediately getting sent home. </p>
<p dir="ltr">Field Day does not include a provision for an acceptable mortality rate. 300VDC on a breadboard is very different than 300VDC snaking around a campground. </p>
<p dir="ltr">Kenneth Finnegan</p>
<div class="gmail_quote">On Jun 11, 2015 7:13 AM, "Robert Bruninga via aprssig" <<a href="mailto:aprssig@tapr.org">aprssig@tapr.org</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div><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><span>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><span>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><span>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><span>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><span>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 href="http://aprs.org/aprs-swer.html" target="_blank">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></div></div>
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