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Re: [TRNSYS-users] about Type94



Vito,

working with PV system I observed there is perfect proportionality between the number of PV panels and annual output of energy.
I'm disconcerted, and the losses?

I would refer you to the technical description of the Type94 model. The equivalent circuit model behind Type94 does not include any losses that depend upon the size of the array such as wiring transmission losses. It simulates the performance of a single panel and then multiplies that performance by the number of modules present in the array.

I have a grid connected PV system, I didn't add the load because it's not important to my application, there is only the inverter (Type48) but Type 94 ask an input, the third, that is the load voltage, in this case is it the sum of the voltage of the PV models connected in series or is it a particular value linked to the inverter (but the inverter brochure doesn't give it)?

PVs tend to be either directly connected to a load or connected to a load through a maximum power point tracker. When directly connected to the load, the PV's operating point is determined by the point at which the current voltage characteristic of the load crosses the current voltage characteristic of the PV. With a maximum power point tracker in place, electronics essentially adjust the load seen by the PV so that the PV runs at its maximum power point. You will notice among the Type94 outputs that there are power, current and voltage at the maximum power point (which do not depend upon the load voltage entered as INPUT 3) and another set of power, current, and voltage, which do depend on the value of your load voltage.

Kind Regards,
  David

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