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PV inverters are generally divided into:
- Grid-connected inverters can be connected in parallel to the public gird
- Off-grid or island solution inverter for solar systems that draw power from a battery unit system or the public grid, but cannot feed energy into the grid the way grid inverters do.
Grid-connected Inverters
Motto Engineering is the official representative in Bulgaria for the products of the German company KACO New Energy. KACO offers a full range of units necessary for the support of solar systems for both single family houses and megawatt solar parks . Various series include :
Singlephase string inverters are used when single-phase gird connection is applied. Photovoltaic panels are connected in series to form strings. 02 series inverters have transformer that separates them galvanically from the network, as this is still a safety requirement in some countries.
● Powador 2002 - 6002 (transformer)
● Powador 3200 - 9600 (transformerless)
Three-phase inverters are used when three-phase grif connection is applied. Photovoltaic panels are connected in series to form strings. TR3 series inverters have transformer that separates them galvanically from the network, as this is still a safety requirement in some countries.
● 16.0 TR3 - 18.0 TR3 (transformer)
● 6.0 TL3 - 72.0 TL3 (transformerless)
Central inverters are used in megawatt power plants. The lowest power of a unit in this series is 100 kW. They have an integrated intelligent power modulation (IPM) and Surge Protection.
● Powador XP
KACO quality is certified by TÜV and RAL - quality stamp for solar installations.
Inverters of the Dutch company Victron Energy are a tested island solution and UPS component in case of blackouts . The company has traditions in solar technologies and the main features are:
● Full Sinewave
● High efficiency and peak power
● Possibility for additional power from the grid and/or diesel generator
● Possibility for a battery charger
According to the combination of different characteristics, the inverters are divided into series:
● VIctron Phoenix
Phoenix series inverters are used for off-grid power supply with battery unit for places without electrification
● Victron Multiplus
Multiplus series inverters are used for autonomous power supply with battery unit or for UPS systems. They have a additional AC input for grid connection or diesel generator.
● Victron Quattro
Quattro series inverters are used for autonomous power supply with battery unit or for UPS systems. They have 2 additional AC inputs for grid connection and diesel generator.