[aprssig] TAPR Dayton Solar Talk

KBØNLY kb0nly at mchsi.com
Mon May 23 11:36:26 EDT 2011

I have tried playing with that PV Watts website, I don't really understand 
it, or its not giving me the correct numbers.  But for my location with a 
1kW setup it says I will only make about $100 worth of energy per year.

That means it would take about 20 years for a 1kW grid tie to pay for 
itself.  Not very economical.



-----Original Message----- 
From: Bob Bruninga
Sent: Monday, May 23, 2011 10:02 AM
To: ve3nec at sympatico.ca ; 'TAPR APRS Mailing List'
Subject: Re: [aprssig] TAPR Dayton Solar Talk

> I'd love to try... cells on my roof.. or preheat... hot water...
> (Is there another list somewhere where we should be posting this ?)

Yes, SolarDIY at yahoogroups.com for Ham radio solar ideas...

> is there an electrical "one way" valve for the electricity?

Yes, all grid-tie systems have that fundamentl characteristic.  They can
only push current against an existing waveform.  If the 60 Hz waveform goes
away, they shut down in a few milliseconds.

> How well P.V. cells would work in S. Ontario
> is anybody's guess. Anyone with experience ?

That is VERY EASY to answer and everyone should do it.  Just google for
PVwatts, the on-line solar power calculator.  It takes only a few seconds to
get a calculation for ANY size array, facing any direction ant any angle at
any location.  AND the calculations includes a 10 year weather model for
exactly your area.  It is the industry standard and is used by EVERYONE...
and it is so much fun to play with ideas and see the results.

Remember, the only thing that matters with solar grid-tie is the total
annual production.


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