Actually tom, many components were 'off-the-shelf' parts, some of which quite possibly came from China.
And the reason they lasted much longer than anticipated is because they expected the solar panels to be dusted over after 3-6 months and lose power...it turns out that the panels being the height they are off the ground, the dust blows off them pretty easily. So they made sure everything would work for at least 3-6 months, and didn't test them much further than that.
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Actually tom, many components were 'off-the-shelf' parts, some of which quite possibly came from China.
And the reason they lasted much longer than anticipated is because they expected the solar panels to be dusted over after 3-6 months and lose power...it turns out that the panels being the height they are off the ground, the dust blows off them pretty easily. So they made sure everything would work for at least 3-6 months, and didn't test them much further than that.