On 28/04/2011 16:42, Olin Lathrop wrote: > He hasn't said > anything that indicates the load will vary seasonally. If the power were > used for heating, then optimizing for winter might make some sense, or if > you knew that location was significantly more cloudy in winter. Unless you are on the equator, midwinter has the least hours of=20 daylight. Thus you want the "best" output to charge the battery for the=20 hours of dusk - dark - dawn . Even if the equipment takes same power all year round (which I assume it=20 does). --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .