• Suitable for use in medium-high power plants connected to a medium voltage distribution network
• High conversion efficiency
• Full nominal power up to 45 °C
• Speed-controlled fans to optimize the efficiency
• Colour LCD touch display with datalogger function
• Fully accessible from the front
• 2 expansion slots to connect communication boards
• MCCB AC side and switch DC side
• Suitable for operation with modules that require the grounding of a pole



Rated power [kW] 500
Maximum PV power (Pmax) [kWp] 570
Minimum recommended PV power (Pmin) [kWp] 400
Recommended Vo@STC voltage (Vo) [V] 780 – 880
DC voltage range, MPPT (Vcc) [V] 530 – 820
Maximum DC voltage (Vcc, max) [V] 1000
Start-up voltage (Vstart-up) [V] 600
Max DC current (Icc, max) [A] 1000
Voltage ripple on modules [%] <1
DC inputs 8 x 140 A (OPT)
Rated AC power (p.f. =1) (Pca) [kW] 500
Rated voltage (Vca) [V] 320 three-phase (+/-15%)
Rated current (Ica) [Aca] 905
Max current (Ica) [Aca] 1065
Rated frequency (Fca) [Hz] 50 (+2 / -3)
Distribution system
Harmonic distortion of the network current (THDi) [%] <3 with rated power
Nominal Power factor (cos φ) [%] >0.99 (adjustable ± 0.9)
Contribution to short circuit current (Icc) [A] 1600
Electromagnetic compatibility YES
CE conformity YES
IP protection degree EN60529 IP20
Environmental categories Indoor, unconditioned
Overvoltage category (EN62109) III (DC) – III (AC)
Pollution degree 3
Permitted temperature range (T) [°C] -20 ÷ 50
Maximum height above sea level [m] 1000
Air change (with detaT=5 °C) [m3/h] 7940
Direction of air flow Intake through the base and the front. Extraction from the top
Max power dissipated (in overload) (P loss) [W – KCal/h] 10000 – 11700
Weight [Kg] 1400
Dimensions (LxPxA) 1500x1000x1900


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.

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. 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 ISO9001 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 touch screen in a convenient 4.3′ format. This is an evolution that allows to control the main parameters of the PV system and interact with it monitoring the operation through the interactive experience of touch functions. The device is able to perform the functions of data logger, allowing the storage of all parameters with a historical database of more than 5 years and view graphically all the variables (power, energy, AC / DC, AC / DC voltage, frequency , temperature and reactive power inverter). The new display has a USB port for data backup and the software upgrade; furthermore is compatible both with PVSER proprietary protocol on the network and with ModBUS/TCP, thus offering easy insertion in any management BMS or data analysis using an Ethernet network.

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.


Manual – Central Inverters HHV-MT

Manual – Display Touch Screen 4.3′

Manual – Display Touch Screen 7′

Manual – Central Inverter ModBus Mapping

Manual – Reactive and Active Power Management

CE declaration of conformity K64-K500 HV-MT

Models HV-MT K64, K80, K100, K200, K250, K330, K500

Technical Information

  • TI-2012-01 (ver 2.0)Requirements for medium and low- voltage transformers connected to Sirio Central Inverters MT range