[aprssig] Solar BS (Bulletin Station)

Ev Tupis w2ev at yahoo.com
Tue May 11 19:43:48 EDT 2021

 Thanks to Bob and Steve for the insight I was looking for.  The math is pretty simple.
I'm off to give it a go!
Ev, W2EV

    On Saturday, May 8, 2021, 1:04:15 PM EDT, Robert Bruninga <bruninga at usna.edu> wrote:  
 Beacon Power budget:
- XCVR assume 1 amp 100% of time = 1 A
- XMTR assume 10 amps 0.3% of time = 0.03 A
- TNC  assume 50 mA 100% of time  = 0.05 A
Total average current  -                        1.08 A
Times 24 hours a day                          28 AHrs

28 AH per day divided by Avg Solar Radiance per day (4 hrs for
Maryland) 28/4= 7 Amp solar panel

But there may be cloudy days so plan on a full size car battery with
maybe 80 AH capacity and maybe 12 Amp panel

Noice that the Receiver is the #1 load by far.  Keep volume all the
way down and measure it exactly rather than using my 1 Amp guess.
It will make a huge difference.  Then recalculate.    TX power is insignificant.


On Sat, May 8, 2021 at 10:37 AM Ev Tupis via aprssig
<aprssig at lists.tapr.org> wrote:
> 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.
> It needs to be solar powered for portability.
> Would someone be willing to help me with a power budget and suggested panel and battery size?
> Kantronics KPC3 and 60-watt Transceiver
> TX ID every 5 minutes with a single bulletin packet
> It will not digipeat in this application.
> Ev, W2EV
> 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
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> aprssig at lists.tapr.org
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