Yun as a data logger - problems and solutions

i starting post because want use yun remote data logger located in remote region solar power.
this serve document development solution , problems.
to start used example data logger sketch  .

part 1 - getting yun write analogue inputs sd card.

the first issues  is
a) data logger ceases write sd if not connected pc via usb. work when connected displaying in serial window 3 x analogue inputs. tried adding blink led routine show me program might stopping compiles fine. when power yun via own power supply micro usb not seem run first code have made blink pin 13.

question why not work ( ie write data sd card ) when disconnected , running under own power , how solve ?

as stated :

part 1 - getting yun in wireless mode read analogue inputs , write data sd card , serial screen.
just plan ahead laid out task sheet of need do  :
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part 2 - yun supplying data html browser (or equivalent ) page on local network
part 3 - yun supplying data html browser (or equivalent ) page viewed non-local network
part 4 - accessing yun remote network yun supplying data html browser page (or equivalent ) 
part 5 - yun sending emails  of data
part 6 - controlling yun remote location
part 7 - yun power control - keeping yun in little power mode possible while measuring data incrementally
part 8 - assembling data logger , installing , testing in field .
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the unit going fitted in remote location , getting internet access wifi may issue yet . if unit can record on sd card represents great backup if fails.  yun measure currents , voltages of solar system log energy accumulated both wind , solar . data used improve system knowing happens when nobody present on site.

any ideas welcome.

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