Guardian M44 Hybrid Power System

Product Information

Guardian M44 Hybrid is a 8RU or 10RU high 19” rack-mounted, integrated hybrid power system providing an output of 48VDC. These systems can accommodate between eight 8 or 12 Guardian family FMPe30.48J hot-swap rectifiers plus an equal number of FPV30.48G hot-swap solar converters.

Maximum load current is 700A with software controlled battery charge current, subject to a total 700A of load plus charge. The rectifiers / solar converters are internally fan cooled with speed control which is a function of load and temperature, keeping acoustic noise to a minimum.

The DC output circuits can provide up to 23 loads which utilize circuit breakers with capacities from 4A to 150A plus up to six 100A to 300A breakers that provide battery protection. An optional programmable low voltage battery disconnect + shunt (LVBD) with 600A capacity is available for use with Lead Acid batteries; while an optional partial load disconnects (PLD), rated at 350A and also programmable, can provide non-critical load shedding when operating on batteries. When the LVBD option and battery breakers are not required the maximum number of available load breakers increases to 23.


Features and Options
  • Fully Hybrid Solution
  • 60A to 700A Capacity
  • Remote Monitoring & Control
  • Field Replaceable Controller
  • Ethernet Comm. with SNMPv3
  • 4 or 10 Form-C Relay Alarms
  • Up to 23 Load Breakers
  • Up to 6 Battery Breakers
  • LCD Display/Keypad
  • Easy Installation
System Voltage-48VDC nominal | -53.5 float (factory default setting, user adjustable)
Maximum Capacity @ 230/400VAC nominal Load - 600A with LVBD & Shunt | 700A without LVBD & Shunt
Battery - 600A discharge with LVBD & Shunt | 700A discharge without LVBD & Shunt
(s/w controlled charge)
No. Rectifier / Solar Converter Slots 8RU - 8 x Rectifier + 8 x Solar Converter | 10RU - 12 x Rectifier + 12 x Solar Converter
Load Circuits Up to 23 (4A to 150A)
Battery Circuits 1 2, 4 or 6 x (100A, 125A, 200A, 250A or 300A)
Rating 1 input, 8 rectifiers - 230Vac/400Vac, 3W+N+PE, 42A, 50/60Hz
1 input, 12 rectifiers - 230Vac/400Vac, 3W+N+PE, 56A, 50/60Hz
Maximum Input Current 1 input, 8 rectifiers - 52.5A per phase @ 185-276VAC
1 input, 12 rectifiers - 70A per phase @ 185-276VAC
Rectifier Power Factor>0.98 (typical)
Surge ProtectionOptional
Rating Nominal MPPT: 160-300 V DC
Maximum Input Current 17.6A, 1 input each module
Alarm Relays4 standard, option for 10
Local Interface 4 x 20 LCD, 4-keypad, USB / RS232, microSD card slot (32GB max,) for data logging
Remote Interface Ethernet / Modem using PowCom™ software package
Ethernet port allows monitoring and control over a IPv4 or IPv6 TCP/IP network.
Web browser support + SNMP v2c and v3
LED IndicationsGreen - System ON; Yellow - Message(s); Red LED - Alarm(s)
External Digital I/O 2 x Inputs, 2 x Outputs (Open Collector)
Symmetry Inputs6 or 12 (can be redefined as analog inputs up to 100VDC)
Low Voltage Battery Disconnect (LVD) 1 x 600A Programmable
Partial Load Disconnect (PLD) - optional 1 x 350A Programmable
Temperature Compensated ChargingProgrammable
EMCEN 300 386; EN61000-6-3 (Emission); EN61000-6-2 (Immunity)
SafetyCAN/CSA C22.2 No 62368-1:2014; UL 62368-1:2014; EN 62368-1:2014/A11:2017
Operating Temperature-40ºC to +55ºC
Storage Temperature-40ºC to +85ºC
DIMENSIONS, ins. (mm)
8RU 18.9 (481) W x 14.0 (255) H x 15.7 (400) D
10RU 18.9 (481) W x 17.5 (444) H x 15.7 (400) D
1. Not available when installed with Green Cubes Lithium Ion battery backup units as these include their own isolation breakers.
2. Not available when installed with Green Cubes Lithium Ion battery backup units as these include their own management system.
Intelligent Recharge Battery type specific algorithm controls recharge time, voltage and battery current limit.
Equalisation Charging Intelligent boost charging calculated from discharge cycles maximizes battery life while minimizing generator runtime.
Battery Disconnection Allows voltage controlled disconnection of batteries.
Enhanced Battery Monitoring Statistical logging of essential battery parameters including number of cycles, DoD, discharge hours, temperature, temperature hours, current and symmetry
Site Logs System tools developed to assist site management. Daily peak load and statistic logs available.
Symmetry Measurement Optional tool that measures batteries for early detection of thermal runaway.
Temperature Compensation Charging

Allows continuous adjustment of output voltage according to battery temperature.

Load Shedding (PLD) Optional feature that allows voltage or time controlled disconnection of non-essential load.