http://www.solar1234.com
This guy has som notes on his solar powered chicken coop that sound close to what you have for requirements.
Bottom of the page has a whole discussion on sizing and what you need.
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I'm a new member in NJ. I have several old manual machines that I'm currently working to restore. I cast and swage random lead objects for fun and I enjoy teaching myself manual machining and assorted skills from dealing with machines several times older than myself.
Current projects I'm...