[RE-wrenches] PV watts question

[Harry Mahon]

Are they adjusting the DC system size field along with the DC to AC ratio?  If not, they are just changing the inverter size without changing array size, and then at 1.5 the clipping is coming in to reduce the yield at the highest ratio.

Mike


Michael Mahon (he/him)
Solar Academy Manager  |  SMA America
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-----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 12:56 PM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Cc: jay <jay.peltz at gmail.com>
Subject: [RE-wrenches] PV watts question

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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