Array virtual energy at MPP

What this step does

The row is the DC energy the array would deliver if the inverter always operated it at its maximum-power point: the nominal energy after the rear-side gain, the irradiance-level, temperature and spectral rows, the flat derates and the wiring loss.

The math

$$E_{mpp} = E_{nom} + \sum_k \Delta E_k \tag{1}$$

where

Symbol	Meaning	Unit
$E_{mpp}$	the array energy at maximum power	kWh/kWp
$E_{nom}$	the array nominal energy	kWh/kWp
$\Delta E_k$	the rows between the two, from the rear-side gain to the DC wiring loss, gains positive and losses negative	kWh/kWp

Reading the number

A total, positive: about 85 to 92 % of the nominal energy on a monofacial system. Hot sites and poorly ventilated rooftop modules sit at the low end. A bifacial rear side adds to it.

API

loss.earr_mpp

Symbols follow the symbol registry.