Unavailability: flat energy fraction

What it is

The share of the exported energy lost to outages and maintenance, as a fraction, applied last at every timestep. It is the expected value of random outages spread over the year. Use the unavailability periods instead to place the outages in time.

Typical values and how to get it

1 to 2 % for a utility-scale system, 0 for a result without outages or when periods are given. If not given: 0: no flat unavailability.

How it is applied

$$E_{\text{grid}} = (1 - f_{\text{unav}})\, E_{\text{before}}$$

where

Symbol	Meaning	Unit
$E_{\text{grid}}$	the energy exported in the timestep after the unavailability	Wh
$f_{\text{unav}}$	this input as a fraction	—
$E_{\text{before}}$	the energy exported in the timestep before it, after every other AC loss and the auxiliaries	Wh

API

ac_losses.unavailability_loss — sent as a fraction 0–1

Symbols follow the symbol registry.