Questions about the calculation formula of photovoltaic power generation

GB50797－2012, in the design specification of photovoltaic power station, for " $E_s$——The description of irradiance under standard conditions” is inconsistent with that in Chapter 2.2.1 and Chapter 6.6.2.

The concept of irradiance on Baidu Encyclopedia
is: irradiance, also known as irradiance, is the radiation flux per unit area of ​​the irradiated surface, unit: watts per square meter (W/㎡).

Therefore, in Section 6.6.2, regarding $E_s$The explanation should read:
$E_s$- irradiance under standard conditions (constant = $1kW/m^2$）。

2.2 Symbols

6.6. Power Generation Calculation