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<div dir="ltr" data-setdir="false">Thanks to Bob and Steve for the insight I was looking for. The math is pretty simple.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I'm off to give it a go!</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Ev, W2EV</div><div dir="ltr" data-setdir="false"><br></div><div><br></div>
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On Saturday, May 8, 2021, 1:04:15 PM EDT, Robert Bruninga <bruninga@usna.edu> wrote:
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<div><div dir="ltr">Beacon Power budget:<br clear="none">- XCVR assume 1 amp 100% of time = 1 A<br clear="none">- XMTR assume 10 amps 0.3% of time = 0.03 A<br clear="none">- TNC assume 50 mA 100% of time = 0.05 A<br clear="none">Total average current - 1.08 A<br clear="none">Times 24 hours a day 28 AHrs<br clear="none"><br clear="none">28 AH per day divided by Avg Solar Radiance per day (4 hrs for<br clear="none">Maryland) 28/4= 7 Amp solar panel<br clear="none"><br clear="none">But there may be cloudy days so plan on a full size car battery with<br clear="none">maybe 80 AH capacity and maybe 12 Amp panel<br clear="none"><br clear="none">Noice that the Receiver is the #1 load by far. Keep volume all the<br clear="none">way down and measure it exactly rather than using my 1 Amp guess.<br clear="none">It will make a huge difference. Then recalculate. TX power is insignificant.<br clear="none"><br clear="none">Bob<br clear="none"><div class="ydpf5a162f9yqt4504515670" id="ydpf5a162f9yqtfd02662"><br clear="none">On Sat, May 8, 2021 at 10:37 AM Ev Tupis via aprssig<br clear="none"><<a shape="rect" href="mailto:aprssig@lists.tapr.org" rel="nofollow" target="_blank">aprssig@lists.tapr.org</a>> wrote:<br clear="none">><br clear="none">> I'd like to setup an APRS-based Bulletin station for a special event to convey helpful information to attendees who are likely to be from out of town.<br clear="none">><br clear="none">> It needs to be solar powered for portability.<br clear="none">><br clear="none">> Would someone be willing to help me with a power budget and suggested panel and battery size?<br clear="none">><br clear="none">> Kantronics KPC3 and 60-watt Transceiver<br clear="none">> TX ID every 5 minutes with a single bulletin packet<br clear="none">><br clear="none">> It will not digipeat in this application.<br clear="none">><br clear="none">> Ev, W2EV<br clear="none">><br clear="none">> PS: If this is helpful to the responses, in the future it may be a fill-in digi for other events...but not right now</div><br clear="none">> _______________________________________________<br clear="none">> aprssig mailing list<br clear="none">> <a shape="rect" href="mailto:aprssig@lists.tapr.org" rel="nofollow" target="_blank">aprssig@lists.tapr.org</a><br clear="none">> <a shape="rect" href="http://lists.tapr.org/mailman/listinfo/aprssig_lists.tapr.org" rel="nofollow" target="_blank">http://lists.tapr.org/mailman/listinfo/aprssig_lists.tapr.org</a><div class="ydpf5a162f9yqt4504515670" id="ydpf5a162f9yqtfd75929"><br clear="none"></div></div></div>
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