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[aprssig] Solar Powered Digi's.

Scott Miller scott at opentrac.org
Tue Dec 4 19:35:30 UTC 2007


I know I did see some guidelines somewhere.  I think you're supposed to 
size the battery for operation with 3 days of no sun, or some such.  Not 
sure on the panel size, but it sounds like you've got a good start there.

Scott
N1VG

John Ronan wrote:
> 
> 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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>>
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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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