[RE-wrenches] PV watts question

[david quattro]

Jay you are right - that doesn’t make sense because with more PV, the
system will reach “max AC out“ power sooner every morning and hold it
longer into the evening




On Mon, Jan 27, 2025 at 12:20 PM George McClellan via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Probably due to clipping.  The panels are generating more energy than the
> power electronics can process, so that excess energy gets cut off (or
> clipped).  It looks like a 1.2 ratio is optimal.
>
> George McClellan | Senior Manager, Technical Sales | REC Americas LLC
> 735 Tank Farm Rd Ste 130 | San Luis Obispo, CA |93401
> <https://www.google.com/maps/search/735+Tank+Farm+Rd+Ste+130+%7C+San+Luis+Obispo,+CA+%7C93401?entry=gmail&source=g>
> Cell phone +1 805 704 3226 | Fax +1 805 357 6104
> www.recgroup.com | george.mcclellan at recgroup.com
>
>
>
>
> -----Original Message-----
> From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> On Behalf
> Of jay via RE-wrenches
> Sent: Monday, January 27, 2025 11:56 AM
> To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
> Cc: jay <jay.peltz at gmail.com>
> Subject: [RE-wrenches] PV watts question
>
> Caution: This is an external email and may be malicious. Please take care
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>
> HI All
>
> I’m working with a customer who’s pretty savvy and is using PV watts for
> his design.
>
> What I can’t figure out is the kwh/year goes down if he uses dc/ac ration
> of 1.5 instead of 1.2 which is the default.
>
> Hes in Santa Fe NM.
>
> .8   ratio=  1663 kwh/yr
> 1.0 ratio = 1668 kwh/yr
> 1.2 ratio =  1671 kwh/yr
> 1.5 ratio = 1623 kwh/yr
>
> I was expecting that more PV = more kWh/yr.
>
> What am i missing?
>
>
> standard module
> fixed roof mount
> 14.08 loss’s
> 10 degree tilt
> 180 degrees
>
>
>
> jay
>
>
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