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[aprssig] Solar Powered Digi's.

John Ronan jronan at tssg.org
Tue Dec 4 19:17:19 UTC 2007


On 4 Dec 2007, at 18:53, Phillip B. Pacier wrote:

> I had a solar powered digi up for five years (W7RBV-2).  I have  
> since transferred ownership of the digi and it is no longer solar  
> powered, but what what information are you looking for?
>
Typical "Rules of thumb" I guess for battery/panel sizing.

I was thinking of a OT2 and maybe a FT-1500 or some other dedicated  
2m Radio.  The OT2 will also broadcast battery voltage as telemetry  
for me.

Its not something we've done before.. so avoiding any 'gotchas' would  
help.
Apparently, the 'average' Sun hours per day over here is about 3.75.   
So I was going to go for a rough figure of TX'ing 20% of the time,  
and try and size the battery so that it never gets discharged below  
80% on that figure.  And then I guess, size the panel so that it  
could recharge the battery from roughly 80% discharge on a 3.5 hour  
day of sun.  Does that sound reasonable?

Regards

John



> 73
> Phil - AD6NH
> www.aprs2.net
>
> John Ronan wrote:
>> Hi,
>>
>> I'm looking for 'rules of thumb' for solar powered digi's.  We've  
>> been offered a site for a digi, but power on it could be an  
>> issue.  Any experience appreciated.
>>
>> de John
>> EI7IG
>> -- 
>> John Ronan <jronan at tssg.org>, +353-51-302938
>> Telecommunications Software &  Systems Group,  http://www.tssg.org
>>
>>
>>
>>
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--
John Ronan <jronan at tssg.org>, +353-51-302938
Telecommunications Software &  Systems Group,  http://www.tssg.org







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