[RE-wrenches] P1 micro performance

[Bill Loesch]

Fellow Wrenches,

No stones from this Missouri P.E. Perhaps if more Greybeards gave such 
candid comments it might influence others toward something other than a 
race to the bottom.

Bill Loesch
Solar 1 - Saint Louis Solar
314 631 1094

On 24-Mar-13 12:07 PM, Ray Walters wrote:
> Hear, Hear, Carl.
>
> That has also always been my experience as well.  In my off grid work, 
> reliability trumps budget, and I almost always over size charge 
> controllers, relays, inverters, fuse holders, etc.  Most failures seem 
> to be related to pushing the design limits of the equipment.
> I spent the past year working on multi MW systems, where they saved 
> every penny possible.  The inverters were undersized by 20 to 25% but 
> sitting in unairconditioned enclosures.  Even better that the 
> projected 30 year life of the system did not even include inverter 
> replacements.
> I'm sure I shall be stoned to death for saying this, but basically the 
> grid tie solar community just doesn't have enough experience under its 
> belt yet to have seen what we learned a decade ago in the off grid world.
> When they start putting call backs, down time, inverter replacements, 
> and the related loss of respect and business into their spread sheets; 
> they'll start oversizing the inverters more, like you, Marco, and many 
> of us already know.
>
> R.Ray Walters
> CTO, Solarray, Inc
> Nabcep Certified PV Installer,
> Licensed Master Electrician
> Solar Design Engineer
> 303 505-8760
> On 3/23/2013 7:19 PM, Carl Emerson wrote:
>>
>> Friends,
>>
>> I am a little puzzled by this topic.
>>
>> What has happened to the good engineering practice of sizing 
>> electronic equipment so that it is not driven to the maximum.
>>
>> My understanding is that the MTBF increases significantly the harder 
>> you drive the unit.
>>
>> This seems to be a case of overdriving the units for short term gain.
>>
>> *Carl Emerson*
>>
>> *Free Power Co. *
>>
>> *Auckland N.Z.***
>>
>>
>>
>> What I *can't* answer is the long-term effect this may have on the 
>> overall
>> life of the inverter.  THAT depends on various intricate design 
>> considerations
>> that went into creating the inverter in the first place.
>>
>> Dan Lepinski, Senior Engineer
>> Exeltech / Exeltech Solar Products
>>
>> With 41 years experience as a design engineer in solar energy.
>>
>
>
>
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