Onduleur Table de recherche

Lookup Table inverters model DC to AC power conversion efficiency by interpolating values from a look up table. The data structure has been designed to be used with data contained in the Inverter Performance Test Summaries available at:

http://www.gosolarcalifornia.org/equipment/inverter_tests/summaries

All of the data needed for this object can be found there by make and model of inverter. The core of the data set is a 3x6 matrix of efficiency at different voltage and power levels. These form the look up table used in the model. Note that EnergyPlus PV models currently model only power and not the voltage and current situation. Therefore, only the nominal voltage data are used. This is the middle row of data in the Go Solar summaries.

GENERAL

Name

The name of the inverter entered here must also be unique across all other inverters in the model.

Category

Select the type of inverter from the options below:

•	Simple - fixed conversion efficiency.

•	Function of Power - conversion efficiency depends on power and is defined using a performance curve.

•	Lookup table - conversion efficiency depends on power and is defined using a look up table.

Availability schedule

The schedule that describes when the inverter is available. If the inverter is scheduled to not be available, by scheduling a value of 0, then it cannot produce AC power and will not consume ancillary power during standby. Any non-zero schedule value means the inverter is available to produce AC power and consume ancillary power during standby. If the Inverter is scheduled to be unavailable but it is being supplied with DC power anyway, then the energy is dissipated as heat.

LOOKUP TABLE

Rated maximum continuous output power

This field contains the rated maximum continuous output power (in W).

Night tare loss power

This field contains the “night tare loss” (in W). This is modelled as ancillary power consumed during standby.

Nominal voltage input

This field contains the nominal DC input voltage (in V). This is “Vnom” in the Go Solar test summaries.

EFFICIENCY AT NOMINAL VOLTAGE

At 10% Power

The fractional efficiency at nominal voltage and 10% power.

At 20% Power

The fractional efficiency at nominal voltage and 20% power.

At 30% Power

The fractional efficiency at nominal voltage and 30% power.

At 50% Power

The fractional efficiency at nominal voltage and 50% power.

At 75% Power

The fractional efficiency at nominal voltage and 75% power.

At 100% Power

The fractional efficiency at nominal voltage and 100% power.

HEAT GAINS TO ZONE

Attach to a zone

If the inverter’s losses are to be modelled as heat gains to a zone in the building thermal model then check this option. Otherwise inverter losses are considered to be lost to outside.

Zone

When including inverter losses and heat gains to a zone select the building zone where the inverter is located.

Radiative fraction

This field contains the fraction of inverter thermal losses that enter the zone as long-wave thermal radiation. This should be a factor between 0.0 and 1.0. The balance of the losses is convective. This data is only required when including inverter losses and gains to a zone.