HPU 300K Hybrid Power System

Technical Specifications | PowerStar 24kVA 3-phase Inverter

OVERVIEW:

MLT Inverters are designed to be robust and tough both mechanically and electrically. The inverters have 150% overload capacity and wide operating temperature range designed for many harsh environments. These inverters are the perfect fit for low maintenance, grid-connected and off-grid, remote installations and industrial power management.

MLT Drives pioneered the design and development of solar inverters to power remote communities and remote installations. Our products havealready been in use reliably for over 25 years. The system architecture guarantees optimal efficiency, maximizes system reliability and results in extended equipment life.

POWERSTAR INVERTERS:

MLT Drives PowerStar inverters are the industry standard for applications involving the integration of grid, generator backup power, solar energy and batteries. Our inverters, if required, can be managed remotely via a GPRS modem, Wi-Fi, Ethernet or direct serial connection.

DESCRIPTION:

The PowerStar inverter primarily ensures that quality power to the load is maintained at all times. If renewable energy sources such as photovoltaic (PV) sources are available power is first drawn from these before using AC sources or battery power. Discharging of the battery is optional if grid power is available.

When no renewable energy is available, the load is powered by the grid supply with the PowerStar inverter used to provide reactive energy so as to maintain the load voltage at its nominal value even if the grid voltage varies within an adjustable tolerance.
The system provides input for two AC sources, so in addition to your grid supply a generator can be connected for backup. This generator can be started automatically when the batteries are low or the load is too big. The AC sources can be used to substitute the total capacity of the PowerStar so that even bigger loads can be powered. This would imply that power from the grid/generator plus the battery power can be combined to give a 200% load supply for the duration until the stored battery supply is depleted.

This system offers an intelligent method of incorporating multiple alternative energy sources to optimize grid-connected or off-grid homes, offices or even entire developments.

SYSTEM FEATURES AND OPTIONS:

Fewer conversion stages to increase overall system efficiency.
Full automatic operation with no break to the supply during transitions from inverter to grid or generator parallel operation.
The backup generator (if installed) can automatically be started when the grid fails.
Renewable energy is fed directly to the load to avoid inefficiencies of the batteries.
Capable of being integrated with renewable/distributed generation sources on both the AC and DC bus.
Local LCD (liquid crystal display) and keypad can be used to change settings, monitor all supplies (Voltage, Current, Watts etc.) and view event/fault logs (time and date stamped).
Load sensing capability. System goes to low power standby when no load is connected.
Smart load control. Certain non-essential loads can be turned off automatically if not enough energy is available.
Optional built-in MPPT regulator for maximizing PV power.

Technical Specifications | PowerStar 24kVA 3-phase Inverter

Specifications

AC Input/output / Unit / PowerStar 24 kVA – 3 phase
Rated voltage / V / 380(±1%), Three Phase, 4 Wire Output.
Nominal Voltage can be adjusted by 10% via system settings
Input voltage range / % / ±19, Adjustable
Rated frequency / Hz / 50
Frequency range / Hz / 47 ... 53 (Adjustable), Inverter to follow grid/generator frequency up to ±3 Hz of the output frequency during parallel operation
Rated continuous output power / kVA / 24 (Inverter Only)
Rated output current per phase / A / 35
Maximum output current per phase / A / 52 (for 30s), 70 (for 5s) , this doubles when supported by the grid
THD I (at rated power) / % / < 3
Surge protection / Yes, Between Phases and to Ground
Short circuit protection / Yes
Internal Protection System
(using electronic detection) /

Continuous Overload Protection
Over Current Protection
Heat-sink over temperature
Over/Under Voltage AC Voltage
Over/Under Frequency
Over/Under Battery Voltage

Control Type / Voltage Source, Microprocessor Regulated
Waveform / Pure sine-wave, low THD
AC Power Control / Phase Controlled Pulse Width Modulation
Battery Input / Unit / PowerStar 24 kVA – 3 phase
Battery Voltage (Nominal) / V / 48
Battery Charge Current / A / 450 (Max.), Adjustable
Short Circuit Protection / Yes , Fused
System / Unit / PowerStar 24 kVA – 3 phase
Efficiency / % / Up to 94 (Stand Alone), Up to 99 during grid feed through
Tare losses no load / W / 140 (2.55A Typical)
Standby – Load Sensing / W / 8 (When set, automatically goes to standby when load is too low. Adjustable threshold)
Dimensions and weight / Unit / PowerStar 24 kVA – 3 phase
Width / mm / 550
Height / mm / 1200
Depth / mm / 510
Weight / kg / 280
General technical specifications / Unit / PowerStar 24 kVA – 3 phase
EMI / Designed to minimise both conducted and radiated EMI emissions
Circuit Breakers / Grid and generator input
Installation / Suitable for indoor installation only
Mounting method / Floor standing
Cooling method / Convection cooled (Heat-sink)
Forced air ventilation(Magnetics)
Air intake at bottom
Air discharge through the enclosure sides
Enclosure / IP30– Not Weatherproof
Colour / RAL 7032 (structured grey)
Climatic conditions / Unit / PowerStar 24 kVA – 3 phase
Ambient temperature / °C / -5 ... 45
Ambient temperature for transport / °C / -25 ... 70
Maximum ambient for rated power / °C / 40
Relative humidity / % / 0 ... 90
Maximum altitude above sea level for rated power at rated temperature / m / 1900
Multipurpose IO Card / PowerStar 24 kVA – 3 phase
Relay (Voltage Free, 200mA, 250Vmax) / 3 Configurable Relays – Non Essential Loads (3 Levels), Generator Start & Crank, Alarm, Fan
Sensor Inputs / Battery Temperature, Fuel Level, Solar irradiance
IO Ports / System Hot Bypass, E-Stop, Take-Power
Solar MPPT Controller / (Optional) / PowerStar 24 kVA – 3 phase
Control Type / Low EMI PWM
Capacity / Standard 4 kW peak (80 amps max at nominal battery voltage
Enclosure / Incorporated in the inverter control cabinet (Top Section)
Logging / PowerStar 24 kVA – 3 phase
Event and Fault Logging / Up to 4000 events and faults are logged, accessible locally. All events are date and time stamped.
System Summations / Load, Generator, Inverter, Battery and Solar kWh
Connectors / PowerStar 24 kVA – 3 phase
Input AC / Terminal Block for 10 mm2 wire per phase with bootlace ferrule
Load Output / Terminal Block for 10 mm2 wire per phase with bootlace ferrule
Input DC (Battery) / Cable terminal for 8 x 50mm2 wires per pole (positive and negative)
Communications (Optional) / Wi-Fi, Ethernet, RS232/RS422 Modbus RTU Slave, GPRS Modem remote access and Flash based web access via centralized server
Operator Panel / PowerStar 24 kVA – 3 phase
Display Type / 40x4 LCD panel with membrane keypad displaying the following:

Grid/Generator and inverter per phase kW, KVA, voltage, frequency
Grid/Generator and inverter on line status
Battery voltage, battery current, battery temperature
PV current, power and voltage
Heat-sink and cabinet temperature
Generator fuel level, Solar radiation
Inverter, Generator load kWh summation, Generator run hours
System settings, event logs