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1.3 DEFINITIONS For the purpose of this guide, the definitions below apply. 1.3.1. Energy Storage System (ESS) — combination of convertors, switches (for example multi-mode inverters) and energy storage devices (for example, batteries), constituting a power system that supports the load or for maintaining continuity of load power in case of input power failure or as the primary source of power. The energy may flow from input to output, output to input or a combination of both. 1.3.2. Grid — the portion of the electrical distribution system that is operated by an electrical distributor. NOTE: An alternative term for ‘grid’ is ‘electricity distribution network’. 1.3.3. Multiple Mode Inverter (MMI) — An inverter that operates in more than one mode, for example having grid-interactive functionality when grid voltage is present and stand-alone functionality when the grid is de-energized or disconnected. NOTES: 1 Inverters with battery storage ports are also considered multiple mode inverters. 2 As defined in IEC 62109-2, Clause 3.107. 1.3.4. Safety Data Sheet (SDS) — previously called a Material Safety Data Sheet (MSDS), is a document that provides information on the properties of hazardous chemicals and how they affect health and safety in the workplace. 1.3.5. Stand-alone Power System (SPS) — Systems that are not connected to the power distribution network of an electricity distributor. Stand-alone systems are supplied with power from one, or more, of a number of sources including, but not limited to, a photovoltaic array, a wind turbine generator, a micro-hydro generator or an engine generator set. 1.3.6. Total Energy Throughput (TET) — a product of the usable energy that can be obtained from an ESS during a cycle and the number of cycles (charge/discharge) the ESS shall support, often measured in MWh. Total Energy Throughput (MWh) =

usable energy (kWh) x battery cycle life 1000

Equation 1 - TOTAL ENERGY THROUGHPUT (MWh)

NOTE: where batteries operate at varying discharge levels, the TET is the sum of the usable energy delivered over the total number of cycles achieved during its service life. 1.3.7. Uninterruptible Power System (UPS) — combination of convertors, switches and energy storage devices (for example, batteries), constituting a power system for maintaining continuity of load power in case of input power failure. Provides a one way flow of energy from input to output.

Guide for ESS Installation - Revision 0.9 May 2016

Page 7 of 36 Copyright 2016

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