----- Original Message -----=20 From: "Peter" To: Sent: Sunday, April 21, 2013 5:10 AM Subject: Re: [OT] GPS functions during wartime > Bob Axtell cotse.net> writes: > > > What's the energy penalty for pointing the PV array off Sun- > > > dead-center, at say 1 arc-second, 1 arc-minute, etc...? > > its not very bad for the standard PV arrays now being made, but more > > severe for the new ones which require a high degree of accuracy. > .... > The Sun moves about 0.25 degrees across the sky in 6 > minutes. I calculated 0.25 deg/min (360 deg/day / 1440 min/day =3D 0.25 deg/min) but maybe there are effects of latitude and date that I'm not considering, but I don't see that. Bob was not very specific with "not very bad" and "more severe" assertions .... Maybe using a hybrid system with an accurate clock and then adjusting it forward or back a second or two each week to achieve maximum power output would be the solution. Gordon Williams --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .