Overview

Maximum profitability

The M88H Inverter has a peak efficiency of 98.8% and has built-in and replaceable AC and DC-side Type II SPDs (surge protection devices). Maximum apparent power 73 kVA / 88 kVA (400 VAC / 480 VAC). 

Flexible applications

Suitable for 400V or 480V AC Grid voltage, Al or Cu cables and 18 x MC4 connector pairs (CF) with string monitoring or DC screw terminals (ST). 2 MPP trackers and a high maximum input voltage up to 1100V allow for extra flexibility in system design.

Convenient wiring box

Convenient and separate wiring box available with built-in Type 2 AC and DC SPDs and certified to protection class II. Two variants: CF model includes 2 x 9 pair Multi-Contact MC4 connectors and string fuses; ST model features AC and DC Terminal Blocks.

Cost advantages

Compared to a central inverter, the M88H string inverter (CF version) will not require additional string combiner boxes. Because of the relatively low weight, pickup trucks and simple lifting devices are sufficient for transport and lifting the unit at the installation site.

Technical Data

Input (DC)
M88H
Max. recommended PV power  90 kWp / 400 VAC; 110 kWp / 480 VAC 
Nominal power 70 kW / 400 VAC; 84 kW / 480 VAC
Voltage range 200 ... 1100 V 
Full power MPP range 540 ... 800 V / 400 VAC; 650 ... 800 V / 480 VAC 1)
Max. current 140 A (70 A per MPP tracker) 
Max. number of MPP trackers 2  
Output (AC)
M88H
Nominal apparent power 66 kVA / 400 VAC; 80 kVA / 480 VAC 2)
Voltage range 400 VAC ± 30% Δ and Y / 480 VAC± 20% Δ and Y; 3 phase + PE (Δ) or 3 phase + N +PE (Y) 3)
Nominal current (per phase) 96 A
Nominal frequency 50 / 60 Hz
Frequency range

50 / 60 Hz ± 5 Hz 3)

Power factor adjustable 0.8 cap ... 0.8 ind
Total harmonic distortion (THD) < 3 % @ nominal apparent power
General Specification
M88H
Model name M88H_122 CF Model (Connectors and Fuses); M88H_121 ST Model (Screw Terminals)
Part number Delta M88H_122 Model: RPI883M122000; M88H_121 Model: RPI883M121200
Max. efficiency 98.8 %
Efficiency EU 98.5 %
Operating temperature -25 ... +60 °C
Full power without derating -25 ... +40 °C
Storage temperature -25 ... +60 °C
Humidity 0 ... 100 % non-condensing
Max. operating altitude 3000 m (above sea level)
Dimensions / connections
M88H
Size (H x W x D) 965 x 615 x 275 mm
Weight 84 kg / 68 kg power module
Cooling Fans with removable fan module
AC connector

M88H_122: Phoenix HKU 70 with screw terminals for conductors

M88H_121: Phoenix HKU 150 with screw terminals for conductors

DC connector

M88H_122: 2 x 9 pair Multi-Contact MC4 (included in package)

M88H_121: Phoenix HKU 150 with screw terminals 

Communication interfaces

2 x RS485, 2 x Dry contacts, 1 x EPO, 6 x Digital inputs 

DC disconnector 2 x integrated mechanically coupled DC disconnectors
Display 3 LEDs, 4-line LCD
Safety / Standards
M88H
Protection degree IP65
Safety class I
Configurable trip parameters Yes
Insulation monitoring Yes
Overload behavior Current limitation; power limitation
Anti-islanding protection / Grid regulation

VDE 0126; ARN 4105; BDEW; UTE C15-712; ERDF-RES-PRO_64E 

EMC

EN61000-6-2; EN61000-6-3; EN61000-3-11; EN61000-3-12 

Safety IEC62109-1 / -2; CE compliance

1) When operated with balanced DC inputs (50/50 %)

2) Cos Phi = 1 (VA = W)

3) AC voltage and frequency range will be programmed according to the individual country requirements.

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