Re: [TRNSYS-users] Max(1,E_solar) means?

[Jeff Thornton <thornton@tess-inc.com>]

MAX is short for maximum and the function returns the larger of the two provided terms.  In this case, it effectively keeps the denominator of your efficiency equation from being zero and causing a divide by zero condition.  Since there will only be power when there is radiation, and the magnitude of the radiation is much larger than 1, it provides a simple way of avoiding the divide by zero.

The MAX function, and all the functions available in TRNSYS equations are described in the provided TRNSYS documentation.

Jeff/TESS

> On Jul 18, 2019, at 9:12 PM, Tri Ayodha via TRNSYS-users <trnsys-users@lists.onebuilding.org> wrote:
> 
> Hello,
> 
> I am now calculating efficiency of pv system. But there was an error since if the radiation is zero then the effiviency will be undefined or infinity. Then, i check the example in PV-inverter how it calculates the efficiency. Apparently the equation is E_elec/max(1,E_solar). The question is what is the meaning of max(1,E_solar)?
> 
> Is there any documentation explaining this?
> 
> Thank you,
> 
> Tri Ayodha
> 
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