Greenbyte Documentation

Solar Irradiance Reference

The Solar Irradiance Reference signal on inverters represents the irradiance for that specific inverter. This signal is used in many KPIs for inverters.

The irradiance value is found using a cascading order of data sources. If data does not exist for the primary source, the next data source will be used and so on. The order of data sources can be configured per inverter and can include any source of irradiance data.

The default behavior is to prioritize the reference pyranometers configured on the inverter. The default order of Irradiance data sources:

  1. Inverter irradiance – In some solar sites, the inverter itself has an irradiance value. If this is the case, that value is prioritized. This is not very common.

  2. Primary reference pyranometers(s)

  3. Secondary reference pyranometers(s)

  4. Tertiary reference pyranometers(s)

  5. Average irradiance of all pyranometers on site

  6. Solargis data – Solargis is a Greenbyte Marketplace add-on that adds irradiance data based on meteorological models

Please contact Greenbyte Support to get help with the configuration.

Technology

Solar: Inverter

Equation

The default data source order method works like this:

solar_irradiance_reference_eq.jpg

where:

Iref

is the solar irradiance reference

I

is the solar irradiance from the device itself

Ipyr,primary

is the irradiance from the primary reference pyranometer or an average if several pyranometers are set

Ipyr,secondary

is the irradiance from the secondary reference pyranometer or an average if several pyranometers are set

Ipyr,tertiary

is the irradiance from the tertiary reference pyranometer or an average if several pyranometers are set

Isite

is an average of the irradiance taken from all pyranometers/met masts at the site

Isolargis

is meteorological irradiance data from the Solargis add-on

Inputs
solar_irradiance_reference_in.jpg
Usage example

In a Average over time widget on a monitor dashboard:

solar_irradiance_ref_usage.png