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HV-MT Central Inverters(100-800 kW)

HV-MT Central Inverters(100-800 kW)

Inverters (On-Grid Inverter)

In order to increase overall plant efficiency, the Sirio HV-MT Central inverters do not have an integrated transformer. This feature and the meticulous design make them ideal for use in medium- high power plants connected to a medium voltage grid.


Technical Specifications

Product Brochure

Main Features:

Maximum energy and safety

The Maximum Power Point Tracking (MPPT) research algorithm implemented in the control system of Sirio Central inverters allows full use of the photovoltaic generator in any radiation and temperature conditions, making the plant work constantly at maximum efficiency. In the absence of solar radiation the converter goes on standby and resumes normal operation when there is radiation again. This feature reduces self-consumption to a minimum and maximizes energy efficiency. The use of speed-controlled fans helps to optimize the overall efficiency of the inverter.

For ensuring higher standards of safety and fire prevention in case of a internal fault in the converter, the Sirio HV-MT 330, 500 and 800 units are equipped as standard with a motorized disconnecting on DC side with undervoltage protection. Moreover, the presence of 8 or 16 inputs, protected by fuses placed on both poles, ensures the protection of the lines coming from field switchboards; this arrangement allows to avoid secondary level switchboards (DC-boxes) during design phase) with a consequent economic saving. Fan operation that is linked to the temperature also increases the expected lifespan and reduces costs incurred for extraordinary maintenance.

All these design features, the careful choice of components and guaranteed quality of production according to ISO 9001 standards make the three-phase inverters Sirio extremely efficient and reliable and guarantee maximum energy production.

Thermal derating

Derating as a function of temperature aimed to safeguard against overheating inverter semiconductors in the case of environments with temperatures exceeding installation specifications or for forced ventilation faults, without causing a complete block of the inverter itself. Sirio Central models ensure rated power output up to 45°C environment. If this threshold is exceeded, the inverter gradually decreases the power fed into the network in such a way as to maintain heat sink temperature within the maximum limit. Once back in the range of thermal normal operation, the inverter restores the optimal working point, again ensuring maximum power transfer.

User Interface

Sirio Central inverters provide a series of new user interfaces composed of an LCD colour touchscreen in a convenient 4.3” format. The millions of colours and quantity of features greatly enrich the user’s interaction experience with the solar inverter.

Easy installation and maintenance

The footprint of these devices has been considerably reduced and there is no need to leave space at the side or back of the equipment since the electronics and power components are fully accessible from the front.

Fully automatic operation ensures ease of use and facilitates installation and startup, thus avoiding installation and configuration errors which could lead to failures or reduced plant productivity.

Customized solutions

AROS is able on request to supply HV-MT Sirio Central inverters specific to the client’s needs. Available options include the integrated isolation control and the pole/earth connection kit (positive or negative) that is required for some kinds of photovoltaic modules.


  • Display: Colour LCD touch screen
  • Communication interface Ethernet, USB, 2xRS232, 2 inputs for remote controls

    (inverter trip and EPO) and 3 operating status signal relays.

  • RS485 optional (slot version)
  • Protocol

    ModBUS and ModBUS/TCP

Rated AC power  100KVA 200KVA 250KVA 330KVA 500KVA 800KVA
Maximum AC power 100KW (cosφ=1) 200KW (cosφ=1) 250KW (cosφ=1) 330KW (cosφ=1) 500KW (cosφ=1) 800KW (cosφ=1)


Maximum DC voltage in an open circuit 880Vdc 880Vdc 1000Vdc
MPPT at full rating range 450÷760Vdc 450÷760Vdc 530÷820Vdc
Operating interval 450÷760Vdc 450÷760Vdc 450÷760Vdc
Maximum input current 245Adc 500Adc 590Adc 780Adc 1180Adc 1600Adc
Threshold voltage for grid supply 540Vdc 540Vdc 600Vdc
Ripple voltage <1% <1% <1%
Input number 1 8 12
MPPT number 1 1 1
D.C. connectors Busbar Busbar Μπάρες


Operating voltage 270Vac 270 Vac 320Vac
Operating range 245÷300Vac (1) 245÷300Vac(1) 288÷350Vac(1)
Maximum power range 245÷300Vac 245÷300Vac 288÷350Vca
Frequency range 47,5÷51,5Hz (1) 47,5÷51,5Hz(1) 47,5÷51,5Hz(1)
Frequency range set up 47÷53Hz 47÷53Hz 47÷53Hz 47÷53Hz
Rated current 214Aac 428Aac 535Aac 145Aca 289Aca 1450Aac
Maximum current 277Aac 554Aac 630Aac 160Aca 321Aca 1600Aac
Total Harmonic Distorsion (THDi) <3% <3%
Power factor from 0,9 ind. to 0,9 cap.(1) from 0,9 ind. to 0,9 cap.(1)
Galvanic separation No No
A.C. connectors Busbar Busbar


Maximum efficiency 98,10% 98,10%
European efficiency 97,50% 97,50%
Stand-by consumption <32W <32W
Overnight consumption <32W <32W
Built-in protections Automatic circuit breaker AC side – Switch-disconnectors DC side Automatic circuit breaker AC side – Switch-disconnectors DC side
Protection durring stand-by operations  Yes Yes
Hearth leakage detection Yes Yes
Heat dissipation Controlled fans Controlled fans
Operating temperature -20°C÷45°C (nο derating) -20°C÷45°C (nο derating)
Storage temperature -20°C÷70°C -20°C÷70°C
Humidity 5÷95% non-condensing 5÷95% non-condensing
Weight 420 Kg 1100 Kg 1150 Kg  1200 Kg  1340 Kg  1580 Kg


EMC EN61000-6-3, EN61000-6-2, EN61000-3-11, EN61000-3-12 EN61000-6-3, EN61000-6-2, EN61000-3-11, EN61000-3-13
Safety EN62109-1, EN62109-2 EN62109-1, EN62109-3
Directives Low Voltage Directive: 2006/95/EC, EMC Directive: 2004/108/EC Low Voltage Directive: 2006/95/EC, EMC Directive: 2004/108/EC
Grid management CEI 0-16, A70, PO12.3 CEI 0-16, A70, PO12.3
(1) These values can vary depending on the local regulations.        


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