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<p>If you want to run your setup year round you won't really know
the requirements until you've had it going in your backyard all
winter.<br>
I've set up a digipeater/wx_stn and have had to increase the solar
capacity greatly.<br>
My setup uses 380 mA for Raspi, TNC, wx setup and receiver. It has
a 10W transmitter.<br>
This winter I had lots of sunless days, in one instance eight in a
row.<br>
I had to upgrade my system to a 75W panel and 120Ah battery.<br>
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<div class="moz-cite-prefix">On 5/11/2021 6:43 PM, Ev Tupis wrote:<br>
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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>
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<div dir="ltr" data-setdir="false">I'm off to give it a go!</div>
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<div dir="ltr" data-setdir="false">Ev, W2EV</div>
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<div> On Saturday, May 8, 2021, 1:04:15 PM EDT, Robert
Bruninga <a class="moz-txt-link-rfc2396E" href="mailto:bruninga@usna.edu"><bruninga@usna.edu></a> wrote: </div>
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<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">
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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" moz-do-not-send="true">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" moz-do-not-send="true">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" moz-do-not-send="true">http://lists.tapr.org/mailman/listinfo/aprssig_lists.tapr.org</a>
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