[RE-wrenches] PV watts question

[George McClellan]

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
Cell phone +1 805 704 3226 | Fax +1 805 357 6104
www.recgroup.com | george.mcclellan at recgroup.com




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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

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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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