Battery Terminology Glossary

P

PCS (Power Conversion System)

Inverter/rectifier equipment that converts DC from batteries to AC for the grid and vice versa. 

Peak Shaving

Using storage to reduce peak power drawn from the grid, lowering demand charges or grid...

Power Rating (MW, kW)

Maximum instantaneous power the system can charge or discharge, e.g., a 25 MW BESS. 

PPA (Power Purchase Agreement)

Contract under which power (and sometimes storage services) are bought/sold at agreed terms and prices. 

Propagation

Spread of thermal runaway from one cell or module to others. 

Pumped Hydro Storage (PHS)

Mechanical LDES technology that stores energy by pumping water uphill and generating when water flows...