WIT 17-25K-HU Series

Product Overview

The WIT 17-25K-HU series covers 17 kW, 18 kW, 20 kW, 22 kW and 25 kW three-phase hybrid models. Each model uses 2 MPPT inputs with 2 strings per MPPT, 40 A maximum current and 50 A maximum short-circuit current per MPPT. The maximum PV input voltage is 1000 V with a rated input voltage of 625 V.

The battery port accepts lithium and lead-acid batteries from 40 V to 60 V at a rated 51.2 V, with up to 420 A charge and discharge current over RS485/CAN. The series provides UPS function with black start, a 10 ms transfer time, 100% three-phase unbalanced output, 110% AC overload, 2x off-grid overload for 10 s and smart remote generator control. IP66 protection and air cooling support outdoor installation.

Key Features

• 20 A string current for high-power modules
• 420 A maximum battery charge and discharge current
• 100% three-phase unbalanced output
• 110% AC overload capability
• 200% off-grid overload capability
• UPS function and black start capability
• Smart remote generator start and stop
• 1000 V maximum PV input voltage
• Class II DC and AC surge protection
• RS485 / CAN / USB communication
• WiFi / LAN monitoring available
• OLED and LED display with APP
• Smart air cooling and IP66 protection
• 5-year warranty

Technical Specifications

DC Input (PV)

Parameter	WIT 17K-HU	WIT 18K-HU	WIT 20K-HU	WIT 22K-HU	WIT 25K-HU
Maximum input power	34 kW	36 kW	40 kW	44 kW	50 kW
Maximum input voltage	1000 V
Start-up voltage	180 V
Rated input voltage	625 V
MPPT voltage range	150-850 V
Number of MPPTs	2
Strings per MPPT	2
Maximum input current per MPPT	40 A / 40 A
Maximum short-circuit current per MPPT	50 A / 50 A

Battery (BAT)

Battery type	Lithium battery / lead-acid battery
Rated battery voltage	51.2 V
Battery voltage range	40-60 V
Number of battery ports	1
Maximum charge / discharge current	420 A
Communication	RS485 / CAN

AC Input (Grid)

Parameter	WIT 17K-HU	WIT 18K-HU	WIT 20K-HU	WIT 22K-HU	WIT 25K-HU
Rated input power	34 kW	36 kW	40 kW	44 kW	50 kW
Maximum input apparent power	37.4 kVA	39.6 kVA	44 kVA	48.4 kVA	55 kVA
Rated input voltage / range	380/400/415 V, -15% to +10%
AC wiring type	3P3W+PE / 3P4W+PE
Maximum input current @220 V	56.67 A	60 A	66.67 A	73.33 A	83.33 A

AC Input (Generator)

Parameter	WIT 17K-HU	WIT 18K-HU	WIT 20K-HU	WIT 22K-HU	WIT 25K-HU
Rated input power	34 kW	36 kW	40 kW	44 kW	50 kW
Maximum input current (GEN / AC coupling) @220 V	51.52/25.75 A	54.55/27.27 A	60.61/30.30 A	66.67/33.33 A	75.76/37.88 A
Rated input voltage	380/400/415 V
Rated input frequency	50 / 60 Hz

AC Output (Grid)

Parameter	WIT 17K-HU	WIT 18K-HU	WIT 20K-HU	WIT 22K-HU	WIT 25K-HU
Rated output power	17 kW	18 kW	20 kW	22 kW	25 kW
Maximum output apparent power	18.7 kVA	19.8 kVA	22 kVA	24.2 kVA	27.5 kVA
Maximum output current @220 V	28.33 A	30 A	33.33 A	36.66 A	41.67 A
Rated output voltage / range	380/400/415 V, -15% to +10%
AC wiring type	3P3W+PE / 3P4W+PE
Power factor adjustment range	-1 to +1
THDi	<3%

AC Output (Load / Off-Grid)

Parameter	WIT 17K-HU	WIT 18K-HU	WIT 20K-HU	WIT 22K-HU	WIT 25K-HU
Rated output power	17 kW	18 kW	20 kW	22 kW	25 kW
Maximum output apparent power	17 kVA	18 kVA	20 kVA	22 kVA	25 kVA
Maximum output current @220 V	51.52 A	54.55 A	60.61 A	66.67 A	75.76 A
Rated output voltage	220/230/240 V (L-N), 380/400/415 V (L-L)
Rated output frequency	50 / 60 Hz
THDv	<3% (linear load)
Load unbalance	100% three-phase unbalance
Overload capability	2x rated power, 10 s
On/off-grid transfer time	≤10 ms

Efficiency

Maximum efficiency	97.60%
European efficiency	97.00%
MPPT efficiency	99.90%

Protection

DC input reverse-polarity protection	Available
DC input switch	Available
AC short-circuit protection	Available
AC overcurrent protection	Available
DC / AC surge protection	Class II / Class II
Insulation resistance monitoring	Available
Ground fault monitoring	Available
Residual current monitoring	Available
Anti-islanding protection	Available
String monitoring	Available
DC arc fault detection	Optional

General Data

Dimensions (W × H × D)	475 × 695 × 241 mm
Weight	58 kg
Operating temperature range	-30 °C to +60 °C (derated above 45 °C)
Relative humidity	0-100%
Maximum operating altitude	4000 m
Protection rating	IP66
Topology	Transformerless
Cooling	Air cooling
Display	OLED + LED / APP
Communication	RS485 / CAN / USB; WiFi / LAN available
Installation	Wall-mounted
Warranty	5 years
Certification	IEC/EN 62109, IEC/EN 61000, IEC 61727, EC 62116, IEC 61683, IEC 60068, EN 50549, VDE 4105

Applications

The series is intended for residential and small commercial three-phase PV-plus-storage systems requiring high battery current, backup power and generator support.

• Residential three-phase PV with storage
• Small commercial rooftop PV with storage
• Backup power for critical three-phase loads
• Generator-hybrid systems with remote control
• Peak-shaving and self-consumption projects

OEM & Custom Requirements

Project supply and private-label requirements can be confirmed against the standard WIT 17-25K-HU platform. Share the required power class, battery type and destination market.

• Private-label enclosure and documentation
• Power class selection from 17 kW to 25 kW
• Battery and generator interface configuration
• Manual localisation for the target market
• Packaging and delivery planning