[RE-wrenches] high insolation value and inverter undersizing

[Jesse Dahl]

I see I forgot to mention that I have 210W modules on my home that were producing the 215W to 223W. 

William,

Your question is a good one.   I've wanted to study this, but haven't had a chance.  I will look into it. 

Jesse 

Sent from my iPhone

On Jan 27, 2013, at 10:05 PM, William Miller <william at millersolar.com> wrote:

> Jesse:
> 
> Do you have any way to compare the total harvest for the day for a given module in a "clipping" scenario versus an unclipping?  The question I want to answer is: Do we improve production enough on the shoulders of the clip to justify the loss on the peak?
> 
> Thanks,
> 
> William Miller
> 
> 
> At 06:25 PM 1/27/2013, you wrote:
>> A while back (3 years)I installed a system (bid spec) for a school that used 215W RECs and D380s on a dual axis tracker.  With the ability to monitor the array, I see constant clipping.  The modules will usually produce 199Ws regularly.  A few days ago we had temps of -34F and clear skies.  My array at home had one of its best days this winter.  I have Tigos on so I can monitor watts, current, temp and voltage. I was seeing anywhere from 215W to 223W from my modules between 11:30am and 1pm.  The modules on the tracker were still producing 199W.  I didn't get an irradiance reading that day but my Tigos showed above IMP readings and way above VMP reading that day.
>> 
>> I've only been doing this for 6 years, so I don't have the experience  that some people on this list have, but it seems foolish to me to waste that production.  It's kinda site specific, but where I live the cold temps and snow reflection seem like something we should be utilizing.
> 
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