HEM 27

TECHNICAL CHARACTERISTICS HEM

REFERENCE FS3190M
OUTPUT AC Output Power (kVA/kW) @50°C [1] 3190
AC Output Power (kVA/kW) @40°C [1] 3300
Operating Grid Voltage (VAC) [2] 34.5kV ±10%
Operating Grid Frequency (Hz) 50Hz/60Hz
Current Harmonic Distortion (THDi) < 3% per IEEE519
Power Factor (cosine phi) [3] 0.5 leading … 0.5 lagging adjustable / Reactive Power injection at night
INPUT MPPt @full power (VDC) 849V-1310V
Maximum DC voltage 1500V
Number of PV inputs [2] Up to 36
Number of Freemaq DC/DC inputs [4] Up to 6
Max. DC continuous current (A) [4] 3970
Max. DC short circuit current (A) [4] 6000
EFFICIENCY & AUXILIARY SUPPLY Efficiency (Max) (η) 98% including MV transformer (preliminary)
CEC (η) 98% including MV transformer (preliminary)
Max. Power Consumption (KVA) 20
CABINET Dimensions [WxDxH] (ft) 21.7 x 7 x 7
Dimensions [WxDxH] (m) 6.6 x 2.2 x 2.2
Weight (lb) 30865
Weight (kg) 14000
Type of ventilation Forced air cooling
ENVIRONMENT Degree of protection NEMA 3R - IP54
Permissible Ambient Temperature -35°C to +60°C / >50°C Active Power derating
Relative Humidity 4% to 100% non condensing
Max. Altitude (above sea level) [5] 2000m
Noise level [6] < 79 dBA
CONTROL INTERFACE Interface Graphic Display
Communication protocol Modbus TCP
Plant Controller Communication Optional
Keyed ON/OFF switch Standard
PROTECTIONS Ground Fault Protection GFDI and Isolation monitoring device
General AC Protection MV Switchgear (configurable)
General DC Protection Fuses
Overvoltage Protection AC, DC Inverter and auxiliary supply type 2
CERTIFICATIONS Safety UL 1741, CSA 22.2 No.107.1-01, UL 62109-1, IEC 62109-1, IEC 62109-2
Compliance NEC 2014 / NEC 2017 (optional)
Utility interconnect IEEE 1547.1-2005 / UL 1741 SA-Sept. 2016

[1] Values at 1.00•Vac nom and cos Ф= 1. Consult Power Electronics for derating curves. [4] Consult Power Electronics for Freemaq DC/DC connection configurations.
[2] Consult Power Electronics for other configurations. [5] Consult Power Electronics for other altitudes.
[3] Consult P-Q charts available: Q(kVAr)=√(S(kVA)2-P(kW)2). [6] Readings taken 1 meter from the back of the unit.
POWER ELECTRONICS
 29

HEMK
UTILITY SCALE CENTRAL STRING INVERTER

FRU FIELD REPLACEABLE UNITS

OUTDOOR DURABILITY

NEMA 3R / IP54

ICOOL 3

ACTIVE HEATING

3 LEVEL TOPOLOGY

NEW RATINGS

COMBINING
THE BENEFITS
OF CENTRAL AND
STRING INVERTERS

The HEMK is the second generation 1500V inverter, based

on the more than proven HEC V1500. This modular solar
inverter offers the advantages of both central and string
inverters. Reaching a very high power density, and an output
power of 3.8MW at 40ºC, it is available in 6 different AC
voltages, providing the flexibility to choose the best solution
for each PV plant. The power stage architecture, composed
of six field replaceable units (FRU), is designed to provide the
highest availability and optimize yield production.
The innovative iCOOL3 cooling system allows the HEMK to
be installed in the harshest environments, thanks to a degree
of protection of up to IP54. This advanced air-cooling system,
reduces the OPEX cost compared to other cooling solutions,
that need the use of complex liquid-cooling systems.
POWER ELECTRONICS

ROBUST DESIGN

Polymeric Painting Closed-Cell Insulation Galvanized Steel | Stainless Steel (Optional)

 HEMK 31

HEMK inverter modules have a design life of greater than

30 years of operation in harsh environments and extreme
weather conditions. HEMK units are tested and ready to
withstand conditions from the frozen Siberian tundra to the
Californian Death Valley, featuring:

Totally sealed electronics cabinet protects electronics

against dust and moisture.

Conformal coating on electronic boards shields PCBs

from harsh atmospheres.

Temperature and humidity controlled active heating

prevents internal water condensation.

C4 degree of protection according to ISO 12944.

Up to C5-M optional.

Closed-Cell insulation panel isolates the cabinet from solar

heat gains.

Roof cover designed to dissipate solar radiation,

reduce heat build-up and avoid water leakages.

The solid HEMK structure avoids the need of additional

external structures.

Random units selected to pass a Factory Water Tightness

Test ensuring product quality.

NEMA 3R / IP54.
POWER ELECTRONICS

COMPACT DESIGN - EASY TO SERVICE

By providing full front access the HEMK series simplifies With the HEMK, Power Electronics offers its most compact
the maintenance tasks, reducing the MTTR (and achieving solution, achieving 3.8MW in just 12ft long, reducing installa-
a lower OPEX). The total access allows a fast swap of the tion costs and labor time.
FRUs without the need of qualified technical personnel.

DC STRING INVERTERS AUXILIARY

CABINET CABINET PANEL

STRING CONCEPT POWER STAGES

The HEMK combines the advantages of a central inverter

with the modularity of the string inverters. Its power stages
are designed to be easily replaceable on the field without the
need of advanced technical service personnel, providing a
safe, reliable and fast Plug&Play assembly system.
Following the modular philosophy of the Freesun series,
the HEMK is composed of 6 FRUs (field replaceable units),
where all the power stages are physically joined in the DC
side and therefore, in the event of a fault, the faulty module is
taken off-line and its power is distributed evenly among the
remaining functioning FRUs.
 HEMK 33

INNOVATIVE COOLING SYSTEM

Based on more than 3 years of experience with our MV degree of protection, without having to maintain cumber-
Variable Speed Drive, the iCOOL3 is the first air-cooling some dust filters or having to use liquid-cooling systems,
system allowing IP54 degree of protection in an outdoor solar avoiding the commonly known inconveniences of it (complex
inverter. iCOOL3 delivers a constant stream of clean air to the maintenance, risk of leaks, higher number of components…),
FRUs, being the most effective way of reaching up to IP54 therefore resulting in an OPEX cost reduction.

VAR AT NIGHT

At night, the HEMK inverter can shift to reactive power compensation mode. The inverter can respond to an external dynamic
signal, a Power Plant Controller command or pre-set reactive power level (kVAr).

ACTIVE HEATING

At night, when the unit is not actively exporting power, the the most efficient and homogeneous way to prevent conden-
inverter can import a small amount of power to keep the sation, increasing the inverters availability and reducing the
inverter internal ambient temperature above -20°C, without maintenance. PATENTED
using external resistors. This autonomous heating system is
POWER ELECTRONICS

MULTILEVEL TOPOLOGY

The multilevel IGBT topology is the most efficient approach design is the result of our experience with 3 level topologies.
to manage high DC link voltages and makes the difference in The 3 level IGBT topology reduces stage losses, increases
the 1,500 Vdc design. Power Electronics has many years of inverter efficiency and minimizes total harmonic distortion.
power design in both inverters and MV drives and the HEMK

TWO-LEVEL INVERTER THREE-LEVEL INVERTER

VOLTAGE (V)

VOLTAGE (V)

OTHER INVERTER TIME (s) POWER ELECTRONICS SOLUTION TIME (s)

EASY TO MONITOR

The Freesun app is the easiest way to monitor the status of

our inverters. All our inverters come with built-in wifi, allowing
remote connectivity to any smart device for detailed updates
and information without the need to open cabinet doors.
The app user friendly interface allows quick and easy access
to critical information (energy registers, production and events).

AVAILABLE INFORMATION Grid and PV field data.

Inverter and Power module data (Vol-
tages, currents, power, temperatures,
I/O status...).
Weather conditions.
Alarms and warnings events.
Energy registers.
Others.
FEATURES Easy Wireless connection.
Comprehensive interface.
Real time data.
Save and copy settings.
LANGUAGE English, Spanish.

SYSTEM REQUIREMENTS iOS or Android devices.

SETTINGS CONTROL Yes

 HEMK 35

DYNAMIC GRID SUPPORT

HEMK firmware includes the latest utility interactive features (LVRT, OVRT, FRS, FRT, Anti-islanding, active and reactive power
curtailment…), and can be configured to meet specific utility requirements.

PV INVERTER LOAD (%)

FULL VOLTAGE RIDE THROUGH COMPATIBILITY
100%
1.4
p.u. VOLTAGE

1.2

0.8

50%
0.6

0.4

0.2

0
0%
-1 0 1 2 3 4
50Hz 52Hz
SECONDS FREQUENCY (Hz)
PO12.3 BDEW PREPA CEI-016 HECO

Low Voltage Ride Through (LVRT or ZVRT). Inverters can withstand any Frequency Regulation System (FRS). Frequency droop algorithm curtails the

voltage dip or profile required by the local utility. The inverter can immediately active power along a preset characteristic curve supporting grid stabilization.

feed the fault with full reactive current, as long as the protection limits are not

exceeded.

Q(U) EXAMPLE: Q(U)

1.2 1.11
Qmax(cap) VOLTAGE
Q(max) 1.1 STEP 2 1.105

1 1.1

0.9 VOLTAGE 1.095

STEP 1
Active and Reactive Power

0.8 1.09

0.7 1.085

U 0.6 1.08

Voltage
0.5 1.075

0.4 1.07

0.3 1.065

0.2 P>0.2Pn 1.06

(lock in)
0.1 1.055
Qmax(ind)
-Q(max) 0 P>0.5Pn 1.05
(lock out)
-0.1 1.045
1 125 250 375 500 625 750 875 1000
Time (s)
Q P V

Q(V) curve. It is a dynamic voltage control function which provides reactive power in order to maintain the voltage as close as possible to its nominal value.

FAST
ISLANDING CONDITION
FREQUENCY (Hz)

SLOW

Transformer Grid

POI Utility
PV array Freesun breaker
TIME (s) inverter
SLOW

R L C Loads

FAST

Frequency Ride Through (FRT). Freesun solar inverters have flexible frequency Anti-islanding. This protection combines passive and active methods that

protection settings and can be easily adjusted to comply with future requirements. eliminates nuisance tripping and reduces grid distortion according to IEC

62116 and IEEE1547.

POWER ELECTRONICS

TECHNICAL CHARACTERISTICS HEMK 690V

FRAME 1 FRAME 2
REFERENCE FS2445K FS3670K
OUTPUT AC Output Power(kVA/kW) @50°C [1] 2445 3670
AC Output Power(kVA/kW) @40°C [1]
2530 3800
Max. AC Output Current (A) @40°C 2117 3175
Operating Grid Voltage(VAC) [2] 690V ±10%
Operating Grid Frequency(Hz) 50Hz/60Hz
Current Harmonic Distortion (THDi) < 3% per IEEE519
Power Factor (cosine phi) [3] 0.5 leading … 0.5 lagging adjustable / Reactive Power injection at night
INPUT MPPt @full power (VDC) 976V-1310V
Maximum DC voltage 1500V
Number of PV inputs [2]
Up to 36
Number of Freemaq DC/DC inputs [4] Up to 6
Max. DC continuous current (A) [4] 2645 3970
Max. DC short circuit current (A) [4]
4000 6000
EFFICIENCY & AUXILIARY SUPPLY Efficiency (Max) (η) 98.9% (preliminary)
Euroeta (η) 98.5% (preliminary) 98.7% (preliminary)
Max. Power Consumption (KVA) 8 10
CABINET Dimensions [WxDxH] (ft) 12 x 7 x 7
Dimensions [WxDxH] (m) 3.7 x 2.2 x 2.2
Weight (lb) 12125 12677
Weight (kg) 5500 5750
Type of ventilation Forced air cooling
ENVIRONMENT Degree of protection NEMA 3R - IP54
Permissible Ambient Temperature -35°C to +60°C / >50°C Active Power derating
Relative Humidity 4% to 100% non condensing
Max. Altitude (above sea level) 2000m; >2000m power derating (Max. 4000m)
Noise level [5] < 79 dBA
CONTROL INTERFACE Interface Graphic Display
Communication protocol Modbus TCP
Plant Controller Communication Optional
Keyed ON/OFF switch Standard
PROTECTIONS Ground Fault Protection GFDI and Isolation monitoring device
General AC Protection Circuit Breaker
General DC Protection Fuses
Overvoltage Protection AC, DC Inverter and auxiliary supply type 2
CERTIFICATIONS Safety UL1741, CSA 22.2 No.107.1-01, UL62109-1, IEC62109-1, IEC62109-2
Compliance NEC 2014 / NEC 2017 (optional)
Utility interconnect EEE 1547.1-2005 / UL1741SA-Sept. 2016

[1] Values at 1.00•Vac nom and cos Ф= 1. [3] Consult P-Q charts available: Q(kVAr)=√(S(kVA)2-P(kW)2).
Consult Power Electronics for derating curves. [4] Consult Power Electronics for Freemaq DC/DC connection configurations.
[2] Consult Power Electronics for other configurations. [5] Readings taken 1 meter from the back of the unit.
 HEMK 37

TECHNICAL CHARACTERISTICS HEMK 660V

FRAME 1 FRAME 2
REFERENCE FS2340K FS3510K
OUTPUT AC Output Power(kVA/kW) @50°C [1] 2340 3510

AC Output Power(kVA/kW) @40°C [1] 2420 3630

Max. AC Output Current (A) @40°C 2117 3175

Operating Grid Voltage(VAC) [2] 660V ±10%
Operating Grid Frequency(Hz) 50Hz/60Hz
Current Harmonic Distortion (THDi) < 3% per IEEE519
Power Factor (cosine phi) [3] 0.5 leading … 0.5 lagging adjustable / Reactive Power injection at night
INPUT MPPt @full power (VDC) 934V-1310V
Maximum DC voltage 1500V
Number of PV inputs [2] Up to 36
Number of Freemaq DC/DC inputs [4] Up to 6
Max. DC continuous current (A) [4] 2645 3970
Max. DC short circuit current (A) [4] 4000 6000
EFFICIENCY & AUXILIARY SUPPLY Efficiency (Max) (η) 98.8% (preliminary) 98.9% (preliminary)
Euroeta (η) 98.5% (preliminary) 98.6% (preliminary)
Max. Power Consumption (KVA) 8 10
CABINET Dimensions [WxDxH] (ft) 12 x 7 x 7
Dimensions [WxDxH] (m) 3.7 x 2.2 x 2.2
Weight (lb) 12125 12677
Weight (kg) 5500 5750
Type of ventilation Forced air cooling
ENVIRONMENT Degree of protection NEMA 3R - IP54
Permissible Ambient Temperature -35°C to +60°C / >50°C Active Power derating
Relative Humidity 4% to 100% non condensing
Max. Altitude (above sea level) 2000m; >2000m power derating (Max. 4000m)
Noise level [5] < 79 dBA
CONTROL INTERFACE Interface Graphic Display
Communication protocol Modbus TCP
Plant Controller Communication Optional
Keyed ON/OFF switch Standard
PROTECTIONS Ground Fault Protection GFDI and Isolation monitoring device
General AC Protection Circuit Breaker
General DC Protection Fuses
Overvoltage Protection AC, DC Inverter and auxiliary supply type 2
CERTIFICATIONS Safety UL1741, CSA 22.2 No.107.1-01, UL62109-1, IEC62109-1, IEC62109-2
Compliance NEC 2014 / NEC 2017 (optional)
Utility interconnect EEE 1547.1-2005 / UL1741SA-Sept. 2016

[1] Values at 1.00•Vac nom and cos Ф= 1. [3] Consult P-Q charts available: Q(kVAr)=√(S(kVA)2-P(kW)2).
Consult Power Electronics for derating curves. [4] Consult Power Electronics for Freemaq DC/DC connection configurations.
[2] Consult Power Electronics for other configurations. [5] Readings taken 1 meter from the back of the unit.
POWER ELECTRONICS

TECHNICAL CHARACTERISTICS HEMK 645V

FRAME 1 FRAME 2
REFERENCE FS2285K FS3430K
OUTPUT AC Output Power(kVA/kW) @50°C [1] 2285 3430
AC Output Power(kVA/kW) @40°C [1]
2365 3550
Max. AC Output Current (A) @40°C 2117 3175
Operating Grid Voltage(VAC) [2] 645V ±10%
Operating Grid Frequency(Hz) 50Hz/60Hz
Current Harmonic Distortion (THDi) < 3% per IEEE519
Power Factor (cosine phi) [3] 0.5 leading … 0.5 lagging adjustable / Reactive Power injection at night
INPUT MPPt @full power (VDC) 913V-1310V
Maximum DC voltage 1500V
Number of PV inputs [2]
Up to 36
Number of Freemaq DC/DC inputs [4] Up to 6
Max. DC continuous current (A) [4] 2645 3970
Max. DC short circuit current (A) [4]
4000 6000
EFFICIENCY & AUXILIARY SUPPLY Efficiency (Max) (η) 98.8% (preliminary) 98.9% (preliminary)
Euroeta (η) 98.4% (preliminary) 98.6% (preliminary)
Max. Power Consumption (KVA) 8 10
CABINET Dimensions [WxDxH] (ft) 12 x 7 x 7
Dimensions [WxDxH] (m) 3.7 x 2.2 x 2.2
Weight (lb) 12125 12677
Weight (kg) 5500 5750
Type of ventilation Forced air cooling
ENVIRONMENT Degree of protection NEMA 3R - IP54
Permissible Ambient Temperature -35°C to +60°C / >50°C Active Power derating
Relative Humidity 4% to 100% non condensing
Max. Altitude (above sea level) 2000m; >2000m power derating (Max. 4000m)
Noise level [5] < 79 dBA
CONTROL INTERFACE Interface Graphic Display
Communication protocol Modbus TCP
Plant Controller Communication Optional
Keyed ON/OFF switch Standard
PROTECTIONS Ground Fault Protection GFDI and Isolation monitoring device
General AC Protection Circuit Breaker
General DC Protection Fuses
Overvoltage Protection AC, DC Inverter and auxiliary supply type 2
CERTIFICATIONS Safety UL1741, CSA 22.2 No.107.1-01, UL62109-1, IEC62109-1, IEC62109-2
Compliance NEC 2014 / NEC 2017 (optional)
Utility interconnect EEE 1547.1-2005 / UL1741SA-Sept. 2016

[1] Values at 1.00•Vac nom and cos Ф= 1. [3] Consult P-Q charts available: Q(kVAr)=√(S(kVA)2-P(kW)2).
Consult Power Electronics for derating curves. [4] Consult Power Electronics for Freemaq DC/DC connection configurations.
[2] Consult Power Electronics for other configurations. [5] Readings taken 1 meter from the back of the unit.
 HEMK 39

TECHNICAL CHARACTERISTICS HEMK 630V

FRAME 1 FRAME 2
REFERENCE FS2235K FS3350K
OUTPUT AC Output Power(kVA/kW) @50°C [1] 2235 3350
AC Output Power(kVA/kW) @40°C [1]
2310 3465
Max. AC Output Current (A) @40°C 2117 3175
Operating Grid Voltage(VAC) [2] 630V ±10%
Operating Grid Frequency(Hz) 50Hz/60Hz
Current Harmonic Distortion (THDi) < 3% per IEEE519
Power Factor (cosine phi) [3] 0.5 leading … 0.5 lagging adjustable / Reactive Power injection at night
INPUT MPPt @full power (VDC) 891V-1310V
Maximum DC voltage 1500V
Number of PV inputs [2]
Up to 36
Number of Freemaq DC/DC inputs [4] Up to 6
Max. DC continuous current (A) [4] 2645 3970
Max. DC short circuit current (A) [4]
4000 6000
EFFICIENCY & AUXILIARY SUPPLY Efficiency (Max) (η) 98.8% (preliminary)
Euroeta (η) 98.4% (preliminary) 98.6% (preliminary)
Max. Power Consumption (KVA) 8 10
CABINET Dimensions [WxDxH] (ft) 12 x 7 x 7
Dimensions [WxDxH] (m) 3.7 x 2.2 x 2.2
Weight (lb) 12125 12677
Weight (kg) 5500 5750
Type of ventilation Forced air cooling
ENVIRONMENT Degree of protection NEMA 3R - IP54
Permissible Ambient Temperature -35°C to +60°C / >50°C Active Power derating
Relative Humidity 4% to 100% non condensing
Max. Altitude (above sea level) 2000m; >2000m power derating (Max. 4000m)
Noise level [5] < 79 dBA
CONTROL INTERFACE Interface Graphic Display
Communication protocol Modbus TCP
Plant Controller Communication Optional
Keyed ON/OFF switch Standard
PROTECTIONS Ground Fault Protection GFDI and Isolation monitoring device
General AC Protection Circuit Breaker
General DC Protection Fuses
Overvoltage Protection AC, DC Inverter and auxiliary supply type 2
CERTIFICATIONS Safety UL1741, CSA 22.2 No.107.1-01, UL62109-1, IEC62109-1, IEC62109-2
Compliance NEC 2014 / NEC 2017 (optional)
Utility interconnect EEE 1547.1-2005 / UL1741SA-Sept. 2016

[1] Values at 1.00•Vac nom and cos Ф= 1. [3] Consult P-Q charts available: Q(kVAr)=√(S(kVA)2-P(kW)2).
Consult Power Electronics for derating curves. [4] Consult Power Electronics for Freemaq DC/DC connection configurations.
[2] Consult Power Electronics for other configurations. [5] Readings taken 1 meter from the back of the unit.
POWER ELECTRONICS

TECHNICAL CHARACTERISTICS HEMK 615V

FRAME 1 FRAME 2
REFERENCE FS2180K FS3270K
OUTPUT AC Output Power(kVA/kW) @50°C [1] 2180 3270
AC Output Power(kVA/kW) @40°C [1]
2255 3380
Max. AC Output Current (A) @40°C 2117 3175
Operating Grid Voltage(VAC) [2] 615V ±10%
Operating Grid Frequency(Hz) 50Hz/60Hz
Current Harmonic Distortion (THDi) < 3% per IEEE519
Power Factor (cosine phi) [3] 0.5 leading … 0.5 lagging adjustable / Reactive Power injection at night
INPUT MPPt @full power (VDC) 870V-1310V
Maximum DC voltage 1500V
Number of PV inputs [2]
Up to 36
Number of Freemaq DC/DC inputs [4] Up to 6
Max. DC continuous current (A) [4] 2645 3970
Max. DC short circuit current (A) [4]
4000 6000
EFFICIENCY & AUXILIARY SUPPLY Efficiency (Max) (η) 98.8% (preliminary)
Euroeta (η) 98.4% (preliminary) 98.6% (preliminary)
Max. Power Consumption (KVA) 8 10
CABINET Dimensions [WxDxH] (ft) 12 x 7 x 7
Dimensions [WxDxH] (m) 3.7 x 2.2 x 2.2
Weight (lb) 12125 12677
Weight (kg) 5500 5750
Type of ventilation Forced air cooling
ENVIRONMENT Degree of protection NEMA 3R - IP54
Permissible Ambient Temperature -35°C to +60°C / >50°C Active Power derating
Relative Humidity 4% to 100% non condensing
Max. Altitude (above sea level) 2000m; >2000m power derating (Max. 4000m)
Noise level [5] < 79 dBA
CONTROL INTERFACE Interface Graphic Display
Communication protocol Modbus TCP
Plant Controller Communication Optional
Keyed ON/OFF switch Standard
PROTECTIONS Ground Fault Protection GFDI and Isolation monitoring device
General AC Protection Circuit Breaker
General DC Protection Fuses
Overvoltage Protection AC, DC Inverter and auxiliary supply type 2
CERTIFICATIONS Safety UL1741, CSA 22.2 No.107.1-01, UL62109-1, IEC62109-1, IEC62109-2
Compliance NEC 2014 / NEC 2017 (optional)
Utility interconnect EEE 1547.1-2005 / UL1741SA-Sept. 2016

[1] Values at 1.00•Vac nom and cos Ф= 1. [3] Consult P-Q charts available: Q(kVAr)=√(S(kVA)2-P(kW)2).
Consult Power Electronics for derating curves. [4] Consult Power Electronics for Freemaq DC/DC connection configurations.
[2] Consult Power Electronics for other configurations. [5] Readings taken 1 meter from the back of the unit.