Power

What it is

The largest power the battery delivers, in kilowatts: AC power at the grid connection with AC coupling, DC power at the inverter input with DC coupling. The power taken to charge is capped at the rating divided by the charge efficiency.

Typical values and how to get it

The rating of the battery's power conversion system, from its datasheet. The right-size rule on the Battery storage page gives half the system AC nameplate as a starting value.

How it is applied

$$d_i\,\eta_d \le P_{bat}, \qquad c_i \le \frac{P_{bat}}{\eta_c}$$

where

Symbol	Meaning	Unit
$d_i$	the power drawn from the cells at timestep $i$	kW
$\eta_d$	the discharge efficiency	—
$P_{bat}$	this rating	kW
$c_i$	the power taken to charge at timestep $i$	kW
$\eta_c$	the charge efficiency	—

References

1. NREL 2019, "Grid-Scale Battery Storage: Frequently Asked Questions", NREL/TP-6A20-74426
2. DiOrio, Dobos & Janzou 2015, "Technoeconomic Modeling of Battery Energy Storage in SAM", NREL/TP-6A20-64641

API

storage.power_kw

Symbols follow the symbol registry.