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This graph shows the "quality" of the probe communications in the "star" system. Note the X axis is not continuous/linear (it shows the diagnostics we have).

The last half shows the link is worse in summer and gets better in the winter (because of less liquid water).

Here is a rough plot (with compressed timeline) from the Iceland deployment base station battery voltage which tells us that the wind power is keeping them full:

Below is a 2009 base station battery voltage sample - showing the high level due to sun in the day and the small ripples/dips caused by the 4minute GPS recordings (which are fairly power hungry).

In June 2010 the base station woke up from winter - see the data that shows