[RE-wrenches] PV watts question

Mon Jan 27 12:42:42 PST 2025

HI David,

My point exactly.  

> On Jan 27, 2025, at 1:35 PM, david quattro via RE-wrenches <re-wrenches at lists.re-wrenches.org> wrote:
> 
> 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 <mailto: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 <http://www.recgroup.com/> | george.mcclellan at recgroup.com <mailto:george.mcclellan at recgroup.com>
>> 
>> 
>> 
>> 
>> -----Original Message-----
>> From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org <mailto: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 <mailto:re-wrenches at lists.re-wrenches.org>>
>> Cc: jay <jay.peltz at gmail.com <mailto:jay.peltz at gmail.com>>
>> Subject: [RE-wrenches] PV watts question
>> 
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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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