[RE-wrenches] Enphase 215

[William Miller]

Keith:

Her's my guess:  Through the MPPT algorithm.  The processor indicates near 
maximum output, the MPPT impedance reduces to throttle back power production.

This is pure speculation, but I'm stickin' with it (untold told otherwise).

Throwing away power?  Yes.  If MPPT is not at maximum power transfer at all 
times then your investment in PV is not earning it's full return.  However, 
your inverter investment is not earning it's full return during the many 
hours of less than optimum insolation.  These are the two factors to 
balance in system design.

William


At 01:01 PM 8/24/2011, you wrote:
>David, et al
>
>Yes, their literature states max output power of 215. Not sure how that is 
>controlled, except for electronically.
>
>So this could be the shunt, so to speak and must take into consideration 
>voltage to follow some algorithm to keep things humming along at that 
>threshold.
>
>Having said this- are we "throwing away" power then?
>
>Keith
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