[RE-wrenches] high insolation value and inverter undersizing

[William Miller]

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.