On Sep 29, 6:01*pm, charles wrote:
In article
,
* *harry wrote:









On Sep 29, 10:50 am, Tim Streater wrote:
In article
,

*harry wrote:
http://www.pvmips.org/publications/017.pdf

In case you don't understand, it means in 20 years there is a 96.5%
chance there will be no problem with a modern inverter. *As mine is
installed in an ideal situation (ie cool, dry and dust free) I expect
it will be even more reliable than that.

So if you have 100 of them (I assume there's one in each turbine?) that
gives you about a 2.8% chance that there won't be a failure, or 97.2%
chance that there will.

100 turbines, that's what, about 5 wind farms or so?
If you had a hundred of them I would need less than three replacement
inverters in 20 years. So that would be one every seven years.
I think that would be a pretty acceptable fail rate.
If you had 100 motor cars, how many breakdowns would you expect in 20
years?
As with other electronic devices most of the defects would fall within
the guarantee period or run for a long time.

that's a very interesting view of the reliability of electronic components.
*You do need to define "a long time". *5 years?, ten years?, most unlikely
to be 20 years.


I have a 1960's radio still works. As long as the components don't
overheat ,or be subjected to vibration or get wet/dusty there's no
reason why they shouldn't last for many decades.
It's the mechanical bits goes wrong.