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Related Manuals for MLT Inverters Oasis 436
Summary of Contents for MLT Inverters Oasis 436
- Page 1 OASIS User Manual...
- Page 2 © 2016 MLT Inverters Edition – April 2016 OASIS USER MANUAL PAGE...
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Page 3: Table Of Contents
Oasis Series User Manual Table of Contents Introduction .......................... 6 Warnings and Cautions ....................6 Contacting MLT Inverters .................... 7 1.2.1 Product Support....................7 1.2.2 Contact Details ..................... 7 1.2.3 Telephone ......................7 System Specifications ....................8 1.3.1 System Ratings ..................... 8 1.3.2 AC Input ........................ - Page 4 Load Sense ........................14 MLT Bridge Communications (Optional Add-on) ............. 14 Mounting and Electrical Connections ................15 Installing the Oasis inverter ..................15 3.1.1 Selecting a suitable location ................15 3.1.2 Mounting ......................15 3.1.3 Making the electrical connections ..............16 3.1.4 Battery Bank Size ....................
- Page 5 5.6.2 Setup Alarms ...................... 30 5.6.3 Date & Time ....................... 31 5.6.4 Relay Control ...................... 32 5.6.5 Battery Cycle ...................... 33 5.6.6 Battery Setup ..................... 34 Configuration ........................37 DIP Switch configuration .................... 37 Connecting an external AC source ................37 6.2.1 Preparation ......................
- Page 6 10.1 Introduction ........................ 46 10.2 Using a Solar System with the Oasis................46 10.3 Battery charger settings ..................... 46 Trouble Shooting ........................ 47 11.1 Faults ........................... 47 11.2 Typical Problems ......................47 11.2.1 My Oasis’ screen fails to respond or a does not appear to be working 47 11.2.2 Why does the Oasis not connect to a running generator? ....
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Page 7: Introduction
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. -
Page 8: Contacting Mlt Inverters
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: Type of Inverter Serial number Battery type Battery bank capacity ... -
Page 9: System Specifications
25 / 50 A (36 V) & 20 / 40 A (48 V) 30 / 60 A (36 V) & 25 / 50 A (48 V) Battery Technology Lead-Acid, Li-Ion (Contact MLT Inverters for details on supported Batteries) Connectors DC Input 10 x 35 mm² Lugs 10 x 50 mm²... -
Page 10: Efficiency
1.3.4 Efficiency Oasis 436 / 448 Oasis 636 / 648 Efficiency Up to 94 % Up to 94 % No Load Power Consumption (On) < 35 W < 40 W No Load Power Consumption (Load Sense) 1.3.5 General Specifications Mounting Method... -
Page 11: Altitude Derating
1.3.8 Altitude Derating Percentage of rated power vs Altitude 1000 1500 2000 2500 3000 3500 4000 Altititude Above Sea Level in Meters Figure 1: De-rating the Oasis inverter output power at high altitude PAGE OASIS USER MANUAL... -
Page 12: System Description
1.4 System Description The Oasis inverter range offers a cost-effective and reliable solution to the home or farm owner faced with unreliable or no grid electricity supply. The inverter operates at low-voltage DC and is transformer-based, which translates to a robust and safe product that guarantees trusted power in the harshest environments. -
Page 13: Figure 2: Identifying Parts Of The Oasis
Figure 2: Identifying parts of the Oasis PAGE OASIS USER MANUAL... -
Page 14: Advanced Features
Advanced Features 2.1 Battery Cycling The Oasis can be configured to maximise self-consumption of renewable power by disconnecting from the grid or source during specified user determined times, enabling optimal use of all available renewable power. In some cases where peak demand prices are increased, the Oasis can thus be programmed to utilise battery power through these periods. -
Page 15: Load Sense
2.3 Load Sense The load sensing feature is used to save power on batteries when there is no load (at night with all the lights and geyser off). The Oasis draws more power when operating (converting AC to DC) that when in standby (no AC output) therefore if there is no load to supply the inverter will go into a “sleep mode”... -
Page 16: Mounting And Electrical Connections
Mounting and Electrical Connections Installing the Oasis inverter For optimal performance, please refer to the following instructions regarding the installation and setup of your newly purchased Oasis. 3.1.1 Selecting a suitable location When selecting a location to mount your Oasis inverter, take note of the following: The Oasis should be mounted indoors, in a well-ventilated area out of direct sunlight, where the ambient temperature does not exceed 45°C (inverter derating applies). -
Page 17: Making The Electrical Connections
Ensure that any electrical connections is dead before touching any potential live wiring. Certain electrical connections must be performed by a qualified electrician. If in doubt about anything, contact MLT Inverters for assistance. Remove the screws that secure the removable bottom cover. - Page 18 Note: External protection devices such as fuses, circuit breakers and earth-leakage protection are the responsibility of the owner, and not of MLT Inverters. MLT Inverters cannot be held responsible for personal injury, death or damage to property or equipment caused by the improper use or installation of this equipment.
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Page 19: Battery Bank Size
Figure 4: AC Input/output Connections on the Oasis 3.1.4 Battery Bank Size If using a lead-acid battery bank, please ensure that the battery bank size is a minimum of 200Ah for a 6kVA and 150Ah for a 4kVA Oasis. Having a too small a battery bank might cause system instability. These are values are guidelines and depending on the type and quality of battery, and size of the load, a larger or smaller bank might be acceptable. -
Page 20: Powering Down The Oasis
Leaving the Pre-charge cable on the Positive (+) terminal of the battery, connect the Positive cable onto the Positive (+) terminal on the battery as well. See Figure 6. Make sure the battery connections are secure. 3.1.6 Powering down the Oasis If it is necessary to turn off or disconnect your Oasis for some reason, follow these simple steps: Turn off the inverter. -
Page 21: Figure 6: Oasis Dc Connections
Figure 6: Oasis DC connections PAGE OASIS USER MANUAL... -
Page 22: Inverter Operation Indicators
Inverter Operation Indicators On the front panel of the Oasis inverter are four LED status indicators: Inverter status Battery status Source status Load status 4.1 Inverter Status This LED indicator is off when the inverter is turned off and green when the inverter is operating normally. -
Page 23: Interface
Interface The Oasis HMI (Human Machine Interface) is a full colour 4.5” touchscreen interface. This chapter covers using the interface to set up the Oasis. 5.1 On/Off Button This push button turns the inverter on and off. 5.2 System Icons There are four system icons on the right hand column. -
Page 24: Control Panel
The blue Inverter icon indicates the mode that the inverter is in. The orange Load icon shows the power and the voltage that is being consumed by the load. The green Battery icon is subscripted by the current that is charging or draining the battery, with a positive value indicating charging, and a negative value indicating discharge. -
Page 25: Graphing And Logs
Export limit (Software v214 and higher only) will attempt to stop any form of power export from a grid- tied inverter connected to the output of the inverter. If the power goes negative and exports to the source, the Oasis inverter will disconnect from the source. If the battery voltage goes above the float charge it will start to increase the output frequency in an attempt to reduce the PV-power. -
Page 26: Load Graphs
5.5.2 Load Graphs The load graph screen graphically shows the total power consumed by the load, notice that the grid power or source power can be as high as 150% of the inverters rated output. 5.5.3 Battery Graphs The battery graph screen graphically illustrates the depletion or replenishing of the battery bank. The green, orange and red bar on the left is a rough indication of charge left. -
Page 27: Event Logs
5.5.4 Event logs Event logs are viewable on this interface screen. It is sorted in a descending list by time and date. General events are marked in black and critical events, typically causing inverter shutdown, are marked in red. The following events are logged: 5.5.4.1 Source Disconnect: High Freq The source was connected and has now the frequency has drifted out of specifications. - Page 28 5.5.4.12 AC Connection Error AC detected on output while inverter is off, typically caused by incorrect wiring. Alternatively, if the error persist, a possible internal source relay fault has occurred, please contact MLT inverters. 5.5.4.13 Battery Critical A low battery condition is occurred, if no external source is connected, it will shut down shortly with a Battery Empty warning.
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Page 29: Production Logs
5.5.5 Production Logs Notice: Measurements should not be used for billing purposes. 5.5.5.1 Source Import The total energy (measured in kWh) taken from the source. The source is typically the grid or alternatively a generator. 5.5.5.2 Source Export The inverter cannot export, but if a grid-tied inverter is connected to the output of the Oasis, the Oasis will measure any power exported by the external grid-tied inverter. -
Page 30: Settings
5.5.5.6 Battery Discharge Total energy converted from DC to AC power, measured on the AC side. 5.6 Settings 5.6.1 Settings Menu Selecting Alarms, Date & Time, Relay Control, Battery Cycle and Battery Setup will take you to their respective setting screen. OASIS USER MANUAL PAGE... -
Page 31: Setup Alarms
5.6.2 Setup Alarms 5.6.2.1 Beep Click on the beep square to toggle on and off. Beep implies that the inverter will sound an audible noise, at a once per second interval. Warnings include the following conditions: (Description of the warning available above in section 5.5.4 Event logs) Continuous overload, Over-temperature, Short Circuit, AC connection error, Battery empty, Battery voltage too high, Grid Loss 5.6.2.2... -
Page 32: Date & Time
5.6.3 Date & Time Set the date and time to the current time, using the up and down arrows. In this example the date is the 21 of November 2014, with the time being 12h45 in the afternoon. Green and blue is for setting the date in the day-month-year format, and the orange buttons are for setting the time in the 24-hour time format. -
Page 33: Relay Control
5.6.4 Relay Control A single, no voltage auxiliary relay can be controlled with the above three user settings. See Figure 2: Identifying parts of the Oasis for the location of the relay. Maximum current is 5.6.4.1 Battery Critical When a battery critical flag is set, the auxiliary relay will be engaged. The battery critical value is triggered at 1.97 VPC. -
Page 34: Battery Cycle
5.6.5 Battery Cycle 5.6.5.1 Start and End Times When the battery cycle is activated in the settings menu, the following system operation will be applicable (Please ensure that the Date & Time is set correctly.): When the Start Time is reached on the clock, the inverter will disconnect from the Source. If the source is a generator, the generator relay will disconnect. -
Page 35: Battery Setup
5.6.5.3 Equalise An equalise charge is nothing more than a forced overcharge of a battery. This helps if a battery is suffering from sulfation and stratification. Sulfation is the gradual build-up of amorphous lead sulfate into stable crystalline structures that deposit on the negative plates during extended periods of discharge. - Page 36 5.6.6.1 Battery Setup – Access Code Before entering the custom Battery Setup screen, a password will be requested. The password is hard coded to 1918. 5.6.6.2 Battery Setup – Lead Acid Under the Battery Setup for Lead Acid configuration page it is possible to fine-tune and adjust the various battery charging options.
- Page 37 5.6.6.3 Battery Setup – Lithium Under the Battery Setup for Lithium Batteries configuration page it is possible to fine-tune and adjust the various battery charging options. Warning: Incorrect settings of battery voltages can cause permanent and irreparable damage to the battery pack. Always set according to the battery manufacturers specifications.
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Page 38: Configuration
Before starting the installation ensure that you read the owner’s handbook for the generator that you are installing and that you are fully aware of requirements such as minimum cable size and generator siting information. MLT Inverters recommends using the correct wire size to connect your generator to your Oasis, sizes listed below. -
Page 39: Configuration Switches
Description of DIP functionality 7.1.1.1 Battery capacity Selection Adjust the battery capacity selection switch to alter the battery charging current. Model Oasis 324 50 A Oasis 436 50 A 25 A Oasis 448 40 A 20 A Oasis 636 60 A... - Page 40 7.1.1.2 Battery Type Selection Adjust the battery type selection to best fit your battery type, be it AGM, Sealed or Flooded Cell type. Typically flooded cell type batteries float and charge at higher voltages than sealed and AGM type of batteries.
- Page 41 7.1.1.8 Load Sense Mode If this is turned ON, then the HMI load sense option is enabled. OFF will disable load sensing and the inverter will always be on, irrespective of load size. 7.1.1.9 Battery Setup enable Flicking this to ON enable the Battery Setup menu. Turning it OFF resets the custom battery settings to default and disables custom battery profiles.
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Page 42: Grid-Tied Inverters
Grid-tied Inverters on Output 8.1 General Grid tied inverters can be connected to the output of the Oasis with the following restrictions: The total PV power should not exceed 90% of the Oasis inverter power rating. The PV-inverter must preferably frequency-based output throttling if fine solar control is needed. -
Page 43: About Batteries
About Batteries 9.1 General A number of batteries can be used together with the Oasis inverter. There are two types of batteries that can be used, Lithium and Lead-Acid. 9.1.1 Sealed Lead-Acid Batteries Standard, Gel, Sealed or Low Maintenance battery which is another name for a normal car battery. This type of battery is designed to provide a large current for a very short period of time. -
Page 44: Replacing A Battery
Providing the site is maintained correctly, a good quality battery bank should last for the full number of rated cycles before needing replacement. 9.4 Replacing a Battery Always replace a battery with a battery of the same type and capacity. Never replace a flooded lead- acid battery with a maintenance free battery or vice-versa. -
Page 45: Battery Charger Settings
The total charging period is approximately 10 hours in this example, but can be much shorter depending on depth of discharge, charging current and load. 9.5.1.1 Stage 1: Bulk Constant Current Charge Period (Hours 0-8) This is the first stage of charge using a constant current until the either the bulk voltage is reached. At the end of this stage, the battery is around 80% full. -
Page 46: Lithium Battery Charging
Li-Po LiFePO4 The Oasis can charge certain Lithium-based battery banks. Lithium batteries are typically charged much faster than Lead-Acid based batteries, and at higher currents. Please see the MLT Inverters website for full information regarding compatible battery banks. 9.6.1 Battery charger settings It is important to select the correct charging current and voltage for your batteries during the installation of your Oasis. -
Page 47: About Solar Panels
About Solar Panels 10.1 Introduction The term solar panel refers to a panel comprising a number of Photovoltaic (PV) cells which convert sunlight into electricity. Solar panels are a source of renewable energy which is becoming increasingly accessible. As with most renewable systems solar panels are unable to provide energy at all times as there may be insufficient sunlight available. -
Page 48: Trouble Shooting
DIP switches and the HMI control panel, will sound. If you have a fault that is not addressed in this manual then you should contact the person who installed your Oasis or, alternatively, MLT Inverters product support. See ‘Contacting MLT Inverters’ on Page 7. 11.2 Typical Problems 11.2.1... -
Page 49: Why Does The Generator Connect And Then Immediately Drop Out
11.2.3 Why does the generator connect and then immediately drop out? This could be caused by overloading of the generator. Check that the generators rated capacity is large enough to supply the load that is connected to the Oasis. Turn off some loads if necessary. If the generator is very small and drops out soon after the Oasis begins charging, the Oasis will reduce the charging current before re-starting the charging cycle. -
Page 50: Glossary
Glossary Alternating current. The utility, generators, and inverters can supply AC. The AC voltage to homes in South Africa is described as 230V AC 50Hz meaning 230V RMS that is alternating between a positive voltage and a negative voltage 50 times a second. Direct current. -
Page 51: Appendix A: Single Line Wiring Diagram
Appendix A: Single Line Wiring Diagram PAGE OASIS USER MANUAL... - Page 52 OASIS USER MANUAL PAGE...
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