On Sunday, 14 May 2017 13:42:39 UTC+1, Keith Harris wrote:
On Saturday, 13 May 2017 19:58:40 UTC+1, Brian Wakem wrote:
Keith Harris wrote:

A few probably silly questions here, but what the hell...

As the Daytime Fan-Aspirated Radiation Shield (FARS) is powered purely by
the solar panels mounted on the ISS door, how long does it run when the
sun goes in, or is it pretty much like an on/off switch?


Mine is a 24hr battery/solar FARS but I know from when my batteries died and
it was running purely off solar that the cut-off was when the solar sensor
was reading around 33-35w/m2.



--
Brian Wakem
Lower Bourne, Farnham, Surrey
http://www.brianwakem.co.uk/weather
Live obs @ 19:57:16 : 13.7C, DP 8.1C, RH 69%, 0.4 mm


Yes the sun almost acts like a switch I've noticed, now that I have a day at home to observe. Still strange that between 10 and 11am the VP was over 1°C higher than the WMII, and the fan was running, can't quite see why. Although the important thing is daily maximum, which will tend to be in the afternoon, when both stations now seem to stay much closer in comparison.

0.8mm of rain earlier this morning.

Keith (Southend)

This shows well why the sunshine is not always in front of the solar panels this time of year.
http://suncalc.net/#/51.5657,0.6745,15/2017.05.15/18:04

Keith (Southend)