[aprssig] aprssig Digest, Vol 203, Issue 3
David Aronovitz
k1lpi at yahoo.com
Sun May 9 12:08:50 EDT 2021
Forget the solar. Adds a lot of complications. Extra wiring, charge controllers, etc. If the event is just a couple of days just bring more batteries. If the location is accessible just replace the battery every night or every other day.
73 de K1 LPI
Sent by telepathy.
> On May 9, 2021, at 09:00, aprssig-request at lists.tapr.org wrote:
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> Today's Topics:
>
> 1. Re: Solar BS (Bulletin Station) (Robert Bruninga)
> 2. Solar BS (bulletin station) (kliegle at myfairpoint.net)
> 3. Re: Solar BS (Bulletin Station) (Stephen H Smith)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 8 May 2021 13:03:38 -0400
> From: Robert Bruninga <bruninga at usna.edu>
> To: Ev Tupis <w2ev at yahoo.com>
> Cc: TAPR APRS Mailing List <aprssig at lists.tapr.org>
> Subject: Re: [aprssig] Solar BS (Bulletin Station)
> Message-ID:
> <CALdCfNJ-mD+Zzu+NwnzrcoXza1UDadRcz-UrXJ8R_1-55WFQXA at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> 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.
>
> Bob
>
>> 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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>
> ------------------------------
>
> Message: 2
> Date: Sat, 08 May 2021 14:52:21 -0400
> From: kliegle at myfairpoint.net
> To: aprssig at lists.tapr.org
> Subject: [aprssig] Solar BS (bulletin station)
> Message-ID: <1620499941.90e6herm8cs40s0g at webmail.myfairpoint.net>
> Content-Type: text/plain; charset="utf-8"
>
>
>
>
>
> I've run a solar powered WX digi for years. One thing I learned is that using a mobile rig for at a solar powered site costs you dearly in idle power consumption. Typical mobile rig draws more than 1A on RX, which a digipeater is doing quite a lot if in a quiet area. To get the equivalent ERP, I would use a higher gain antenna and if possible, a higher location (no ERP gain but better RX!)
>
> ?An HT on RX is much more efficient on idle power consumption.
>
> Example:
>
> Mobile rig RX 1A => 1Ax24Hr =>? 24A-Hr?per day
>
> HT RX 0.150A =>? 0.15x24Hr =>? 3.6A-Hr per day
>
>
>
> 12V solar panels are typically about $1 per watt new, but I never buy new. They appear on Craigslist from time to time as people remove them from service, and can be had for very small money. Just be warned, the PWM solar chargers can wreak havoc on nearby HF operations. I have the Morningstar 30A PWM's, but cutting a jumper on the circuit board makes it a simple pulse type (on/off) and no birdies drifting up and down the HF spectrum!
>
> As for batteries, the entire repeater system co-located at the site was solar powered as well. I had a bank of Sam's Club Golf Cart Batteries (6V at 225A-Hr) in series/parallel combination to get me 14V @450A-Hr of storage. Even on a cloudy day, the net gain into the battery bank was still positive. Winter, with the short daylight hours was the most critical time on top of the batteries stored in an unheated shed. I now have commercial power, but a few panels are still in use for backup charging incase I'm not around to fire up the whole house/farm generator.
>
> 73 Kriss KA1GJU
> KA1GJU-X? X=INT(9)
> ?
>
>
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> Message: 3
> Date: Sat, 8 May 2021 15:01:46 -0400
> From: Stephen H Smith <WA8LMF2 at aol.com>
> To: aprssig at lists.tapr.org
> Subject: Re: [aprssig] Solar BS (Bulletin Station)
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