[RE-wrenches] PV watts question

[August Goers]

Hi Jay,

Per your note, annual kWh production should go up as you add more modules
to a project, even if you are increasing the DC/AC ratio. I wonder if the
metric you are reporting out is kWh per kWp per year, or specific yield?

https://www.solarpowerworldonline.com/2017/08/specific-yield-overview/

-August



On Mon, Jan 27, 2025 at 11:56 AM jay via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> 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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