MLT Inverters Nomad 80 User manual

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NOMAD 80
User Manual

© 2017 MLT Inverters
3rd Edition – May 2017
NOMAD USER MANUAL PAGE 1

Table of Contents
1. Introduction .......................................................................................................................... 6
1.1 Warnings and Cautions................................................................................................ 6
1.2 Contacting MLT Inverters ............................................................................................ 7
1.2.1 Product Support................................................................................................... 7
1.2.2 Contact Details..................................................................................................... 7
1.2.3 Telephone ............................................................................................................ 7
1.3 System Specifications................................................................................................... 8
1.3.1System Ratings..................................................................................................... 8
1.3.2 Battery Input ........................................................................................................ 8
1.3.3 Efficiency .............................................................................................................. 8
1.3.4 General Specifications ......................................................................................... 8
1.3.5 Climatic Conditions.............................................................................................. 9
1.3.6 Operator Panel .................................................................................................... 9
1.3.7 Altitude Derating .................................................................................................9
2. Advanced Features.............................................................................................................11
2.1 Two Independent Maximum Power Point Trackers ................................................11
2.2 Wide PV String Voltage Range...................................................................................11
2.3 Ground-Fault Detector Interrupter ........................................................................... 11
2.4 Compatible with Various Battery Technologies .......................................................11
2.5 Lead-Acid Battery Equalise ........................................................................................11
2.6 Auxiliary Relay control ...............................................................................................12
2.7 MLT Bridge Communications (Optional Add-on) .....................................................12
3. Solar Calculations................................................................................................................13
3.1 Open Circuit Input Calculations .................................................................................13
4. Mounting and Electrical Connections ...............................................................................14
4.1 Installing the Nomad charge controller .................................................................... 14
4.1.1 Selecting a suitable location.............................................................................. 14
4.1.2 Mounting ...........................................................................................................14
PAGE 2NOMAD USER MANUAL

4.1.3 Making the electrical connections.................................................................... 15
5. Charge Controller Operation Indicators............................................................................17
5.1 Solar Status .................................................................................................................17
5.2 Charge controller Status ............................................................................................ 17
5.3 Battery Status ............................................................................................................. 17
6. Interface ..............................................................................................................................18
6.1 System Icons...............................................................................................................18
6.2 Dashboard .................................................................................................................. 18
6.3 Control Panel..............................................................................................................19
6.4 Graphing and Logs...................................................................................................... 20
6.4.1 Solar Output Graphs..........................................................................................20
6.4.2 Solar Sweep Graph ............................................................................................ 20
6.4.3 Battery Graphs................................................................................................... 21
6.4.4 Event logs ........................................................................................................... 21
6.5 Settings ....................................................................................................................... 23
6.5.1 Settings Menu.................................................................................................... 23
6.5.2 Setup Alarms...................................................................................................... 23
6.5.3 Date & Time .......................................................................................................24
6.5.4 Relay Control...................................................................................................... 25
6.5.5 MPPT Settings .................................................................................................... 26
6.5.6 Battery Setup ..................................................................................................... 27
7. Faults and Warnings...........................................................................................................30
7.1 Fault/Warning screen ................................................................................................ 30
7.2 Description of Warning and Faults............................................................................30
7.2.1 Operating Temperature Limit Reached............................................................30
7.2.2 High Battery Voltage.......................................................................................... 30
7.2.3 High Solar Voltage .............................................................................................31
7.2.4Incorrect Nominal Voltage ................................................................................ 31
8. Ground Fault Detector Interrupter (GFDI)........................................................................32
NOMAD USER MANUAL PAGE 3

8.1 Selecting ground fault reference............................................................................... 32
8.1.1 Battery Positive..................................................................................................32
8.1.2 Photovoltaic/Battery Negative ......................................................................... 32
8.1.3 Photovoltaic Positive ......................................................................................... 33
8.1.4 PV Floating .........................................................................................................33
9. External Connections .........................................................................................................34
10. Batteries ..............................................................................................................................35
10.1 General ....................................................................................................................... 35
10.1.1 Sealed Lead-Acid Batteries...................................................................... 35
10.1.2 Deep Cycle Lead-Acid Batteries ..............................................................35
10.1.3 Lithium Batteries...................................................................................... 35
10.2 Battery Bank Location................................................................................................35
10.3 Maintenance .............................................................................................................. 35
10.4 Replacing a Battery ....................................................................................................36
10.5 Lead-Acid Battery Charging .......................................................................................36
10.5.1 Charging Stages........................................................................................ 36
10.5.2 Battery charger settings .......................................................................... 37
10.6 Lithium Battery Charging ...........................................................................................38
10.6.1 Battery charger settings .......................................................................... 39
11. Trouble Shooting ................................................................................................................ 40
11.1 Faults...........................................................................................................................40
11.2 Typical Problems ........................................................................................................40
11.2.1 The Nomad is not charging the batteries...............................................40
11.2.2 Why didn’t I get the usual capacity from my storage batteries? .......... 40
12. Glossary ...............................................................................................................................41
Appendix A: Sample Single Line Wiring Diagram .......................................................................42
PAGE 4NOMAD USER MANUAL

Figures
Figure 1: De-rating the Nomad charge controller output power at high altitude ....................... 9
Figure 2: Identifying parts of the Nomad .....................................................................................10
Figure 3: Wall mounting................................................................................................................ 15
Figure 4: Input/output connections on the Nomad ....................................................................16
Figure 5: GFDI Jumper Selection (Bottom Cover Removed) .......................................................33
NOMAD USER MANUAL PAGE 5

1. Introduction
1.1 Warnings and Cautions
A safety instruction (message) includes a hazard alert symbol and a signal word, WARNING or
CAUTION. Each signal word has the following meaning:
HIGH VOLTAGE: This symbol indicates the presence of a high voltage. It calls your
attention to items or operations that could be dangerous to yourself or others
operating this equipment. Read the message and follow the instructions carefully.
WARNING: Indicates a potentially hazardous situation which, if not avoided, can result
in serious injury or death.
CAUTION: Indicates a potentially hazardous situation which, if not avoided, can result
in minor to moderate injury, or serious damage to the product. The situation
described in the CAUTION may, if not avoided, lead to serious results.
GENERAL WARNINGS
DANGER OF ELECTRIC SHOCK. There are no user serviceable parts inside the charge controller. DO NOT attempt
to make repairs or alterations to the unit.
WARNING: This equipment should be installed, adjusted, and serviced by qualified electrical maintenance
personnel familiar with the construction and operation of the equipment and the hazards involved. Failure to
observe this precaution could result in personal injury.
GENERAL CAUTIONS
CAUTION: Always wear personal protective equipment (protective clothing, gloves, and safety boots) while
performing an installation or maintenance, to avoid the danger of injuries.
CAUTION: Proper grounds, disconnecting devices, e.g. bypass boxes and other safety devices and their location
are the responsibility of the user and are not provided by MLT Inverters.
CAUTION: Do not cover the device or store it in a small space - always keep it well ventilated and well away from
flammable gases or powders. Components in the device could potentially cause a small electric spark that could
ignite flammable gas or powders. Flammable gases are created by batteries and can become a hazard in poorly
ventilated spaces.
CAUTION: For indoor use only and MUST be installed in a dry area free from conductive liquids or conductive
debris. If part of the charge controller becomes submerged in water look for a safe way to isolate it at the
distribution board and if possible at the batteries.
PAGE 6NOMAD USER MANUAL

1.2 Contacting MLT Inverters
1.2.1 Product Support
When contacting Product Support via telephone, email or fax please provide the following information
for the fastest possible service:
Charge controller model number
Serial number
Battery type
Battery bank capacity
Battery bank voltage
A description of the event
Note that the serial number is available on the serial plate that is attached to the bottom of the machine
inside the cover.
1.2.2 Contact Details
Telephone: [phone]
Email: [e-mail]
Address: 103 Garfield Road
Kenilworth 7708
Cape Town
South Africa
1.2.3 Telephone
You can reach technical support by telephone directly Monday to Friday between 08h00 and 17h00
(GMT +2 hours). Queries outside of these hours should be directed to [e-mail] and
will be answered at the earliest opportunity. When contacting technical support, please ensure that
you have the information listed above available.
NOMAD USER MANUAL PAGE 7

1.3 System Specifications
1.3.1 System Ratings
Nomad 80 Charge Controller
Number of Input Ports 2 (Individual MPPT Control)
Input Vmp Voltage Range 65 - 375 Vdc per port
Maximum Input Voltage 400 Vdc
Nominal Photovoltaic Power (24/36/48V) 1000 W / 1500 W / 2000 W (per port)
Maximum Photovoltaic Power (24/36/48V) 1500 W / 2250 W / 3000 W (per port)
Output Voltage range 20 – 63 Vdc
Max Battery Output Current 80A (2x 40 A per port)
Programmable Aux. Control Output 30Vdc / 277Vac / 5A relay
Protection Ground-Fault Detector Interrupter (GFDI), Overvoltage
(Photovoltaic and Battery), Reverse Polarity
(Photovoltaic and Battery)
1.3.2 Battery Input
Nominal Battery Voltages 24, 36 and 48 Vdc (configurable at start-up)
Battery Temperature Compensation Optional Remote Temperature Sensor (RTS) available
1.3.3 Efficiency
Efficiency Up to 95 % @ 80Adc in a 48Vdc system (typical)
No Load Power Consumption Less than 2.5 W
1.3.4 General Specifications
Mounting Method Wall Mounted (Bracket and fasteners included)
Dimensions (W x H x D) 210 x 380 x 147 mm (Shipping: 275 x 440 x 215)
IP/NEMA Rating IP20 / NEMA1
Colour RAL9002 / RAL9011
Weight 6 kg / Shipping: 6.2 kg
PAGE 8NOMAD USER MANUAL

Architecture Forced Air Cooling
Compliance IEC62109-1
1.3.5 Climatic Conditions
Ambient Temperature -10 to 60 °C (derated above 40°C)
Ambient Transport Temperature
-25 .. 70 °C
Maximum Ambient for Rated Power 40 °C
Relative Humidity (Non-Condensing) 5 .. 85 %
Maximum Altitude for Rated Power
1000 m above sea level
(Power derated for High Altitude)
1.3.6 Operator Panel
Display Type Full colour Touch screen 4.3 inch LCD
Graphs 24 hour history display of solar power production (both
ports), battery and most recent sweep graph (both
ports)
Data and Event Logs Daily solar production (kWh) and peak power (kW).
Logging of system events.
All specifications listed above performed at nominal voltage, frequency and temperature unless
otherwise noted.
1.3.7 Altitude Derating
Figure 1: De-rating the Nomad charge controller output power at high altitude
75
85
95
105
0 1000 2000 3000 4000
Percentage of Rated
Power
Altitude in meters above Sealevel
Altitude Derating
NOMAD USER MANUAL PAGE 9