Glossary of terms

Key terms and abbreviations from the world of photovoltaics and energy storage.

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FVE Photovoltaic power plant
A facility that converts solar radiation into electrical energy using photovoltaic panels.
SVR Grid balancing services
Ancillary services provided to the transmission system operator (ČEPS) to maintain balance between electricity production and consumption.
kWp / MWp Kilowatt-peak / Megawatt-peak
Unit of peak (installed) PV power under Standard Test Conditions (STC).
STC Standard Test Conditions
Reference conditions for PV panel performance measurement: irradiance 1000 W/m², temperature 25 °C, AM 1.5 spectrum.
DC / AC Direct Current / Alternating Current
PV panels produce DC; the inverter converts it to AC for grid connection.
OTE Electricity Market Operator (Czech Republic)
State organization managing the Czech electricity market, responsible for balancing settlement among other things.
TDI Investor technical supervision
Independent oversight of PV plant construction quality and progress on behalf of the investor.
MPPT Maximum Power Point Tracker
Electronic circuit in inverters that maximizes power extracted from PV panels based on current conditions.
IRR Internal Rate of Return
Financial metric of a project's investment attractiveness — the discount rate at which NPV equals zero.
UPOS Building installation conditions adjustment
Document governing building placement conditions — often required by building authorities for PV plant projects.
POI Point of Interconnection
Physical point where a PV plant connects to the distribution or transmission grid.
LCOE Levelized Cost of Energy
Average cost per unit of electricity produced over the entire lifetime of the installation — a key PV economics metric.
EIA Environmental Impact Assessment
Process of evaluating a project's environmental impact, mandatory for large PV plants above a certain capacity threshold.
BESS Battery Energy Storage System
System for storing electrical energy in batteries — used both for increasing PV self-consumption and for grid balancing services.

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