Victron energy Isolated SmartSolar MPPT RS 450/100 User manual

Isolated SmartSolar MPPT RS
SmartSolar MPPT RS 450|100 & 450|200
Rev 05 02/2021
ENGLISH

Table of Contents
1. Safety Instructions ................................................................................................................... 1
2. General Description ................................................................................................................. 3
2.1. Features ...................................................................................................................... 3
2.2. Interfacing and Communications .......................................................................................... 3
2.3. Setup options ................................................................................................................ 4
3. Installation ............................................................................................................................. 5
3.1. Location of the MPPT ....................................................................................................... 5
3.2. MPPT grounding and detection of PV array insulation faults ........................................................... 5
3.3. Battery and battery lead requirements .................................................................................... 6
3.4. Solar array configuration .................................................................................................... 6
3.4.1. MPPT RS Example PV Configuration .......................................................................... 7
3.5. Cable connection sequence ................................................................................................ 8
3.6. Can bus interface ............................................................................................................ 8
3.7. Synchronised parallel operation ........................................................................................... 9
3.8. Energy Storage System (ESS) ............................................................................................. 9
3.9. User I/O ....................................................................................................................... 9
3.9.1. Remote on/off connector ......................................................................................... 9
3.9.2. Programmable relay .............................................................................................. 9
3.9.3. Voltage sense ...................................................................................................... 9
3.9.4. Temperature sensor ............................................................................................... 9
3.9.5. Programmable analog/digital input ports ..................................................................... 10
3.9.6. User I/O terminal diagram ...................................................................................... 10
3.9.7. User I/O functions ............................................................................................... 10
3.10. Programming with VictronConnect ..................................................................................... 10
3.10.1. Settings ......................................................................................................... 11
3.10.2. Battery settings ................................................................................................ 11
3.10.3. Programmable relay ........................................................................................... 14
4. Operation ............................................................................................................................ 16
4.1. Device display ............................................................................................................. 16
4.2. STATUS - Live Data Information ......................................................................................... 17
4.3. HISTORY - Thirty-day Graphic ........................................................................................... 18
4.4. Protections and automatic restarts ...................................................................................... 19
4.4.1. High battery voltage ............................................................................................. 19
4.4.2. High temperature ................................................................................................ 19
5. Troubleshooting .................................................................................................................... 20
6. Technical Specifications .......................................................................................................... 21
7. Appendix ............................................................................................................................. 23
7.1. Appendix A : Connection Overview ..................................................................................... 23
7.2. Appendix B : Block Diagram ............................................................................................. 25
7.3. Appendix C : Example system schematic and wiring diagram ....................................................... 26
7.4. Appendix D : Dimensions ................................................................................................. 27
Isolated SmartSolar MPPT RS

1. Safety Instructions
ELECTRIC SHOCK HAZARD
Please read this manual carefully before the product is installed and put into use.
This product is designed and tested in accordance with international standards. The equipment should be used for the designated
application only.
Refer to the specifications provided by the manufacturer of the battery to ensure that the battery is suitable for use with this
product. The battery manufacturer's safety instructions should always be observed.
Protect the solar modules from incident light during installation, e.g. cover them.
Never touch uninsulated cable ends.
Use only insulated tools.
Connections must always be made in the sequence described in the installation section of this manual.
The installer of the product must provide a means for cable strain relief to prevent the transmission of stress to the connections.
In addition to this manual, the system operation or service manual must include a battery maintenance manual applicable to the
type of batteries used.
SELECTION OF WIRE CONDUCTORS
Use flexible multistranded copper cable for the battery and PV connections.
The maximum diameter of the individual strands is 0,4mm/0,125mm² (0.016 inch/AWG26).
A 25mm² cable, for example, should have at least 196 strands (class 5 or higher stranding according to VDE 0295, IEC 60228
and BS6360).
An AWG2 gauge cable should have at least 259/26 stranding (259 strands of AWG26)
Maximum operating temperature: ≥ 90°C
Example of suitable cable: class 5 “Tri-rated” cable (it has three approvals: American (UL), Canadian (CSA) and British (BS)).
In case of thicker strands the contact area will be too small and the resulting high contact resistance will cause severe
overheating, eventually resulting in fire.
RISK OF INJURY OR DEATH
The internals can carry a 400-500V DC voltage even when the product is off!
Input and/or output terminals may still be dangerously energized, even when the equipment is switched off. Always disconnect all
power connections (e.g. the battery, DC solar isolator, etc) and wait at least 5 minutes before carrying out work on the product.
The product has no internal user-serviceable components. Do not remove the front plate or operate the product if any panels
have been removed. All servicing must be undertaken by qualified personnel.
Please read the installation instructions in the installation manual before installing the equipment.
This is a Safety Class I product (supplied with a protective grounding terminal). The chassis must be grounded. Whenever it is
likely that the grounding protection has been damaged, the product must be turned off and secured against unintended operation;
please contact qualified service staff.
Environment and Access
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Ensure that the equipment is used under the correct ambient conditions. Never operate the product in a wet or dusty
environment. Never use the product where there is a risk of gas or dust explosions. Ensure there is adequate free space for
ventilation above and below the product and check that the ventilation vents are not blocked.
Installation of this product must in a location that restricts access by persons (including children) with reduced physical, sensory
or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning
use of the appliance by a person responsible for their safety.
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2. General Description
The MPPT RS is a solar charge controller intended to operate with a PV voltage of between 80-400V and designed to charge a
48V battery bank.
2.1. Features
Ultra-fast Maximum Power Point Tracking (MPPT)
Especially in case of a clouded sky, when light intensity is changing continuously, a fast MPPT algorithm will improve energy
harvest by up to 30% compared to PWM charge controllers and by up to 10% compared to slower MPPT controllers.
Advanced Maximum Power Point Detection in case of partial shading conditions
If partial shading occurs, two or more maximum power points may be present on the power-voltage curve. Conventional MPPTs
tend to lock to a local MPP, which may not be the optimum MPP. The innovative SmartSolar algorithm will always maximize
energy harvest by locking to the optimum MPP.
Outstanding conversion efficiency
Maximum efficiency of 96%. Full output current up to 40°C (104°F).
Flexible charge algorithm
Fully programmable charge algorithm, and eight preprogrammed battery presets.
Extensive electronic protection
Over-temperature protection and power derating when temperature is high.
Isolated PV connections for additional safety
Full galvanic isolation between PV and battery connections provide additional overall system safety.
Optional external voltage and temperature sensor
Wired connections are available for battery voltage and temperature sensing. The Solar Charger uses these measurements to
optimize its charge parameters. The accuracy of the data it transmits will improve battery charging efficiency, and prolong battery
life. The Smart Battery Sense and other VE.Smart networking features are not currently supported.
2.2. Interfacing and Communications
Bluetooth Smart built-in
The wireless solution to set-up, monitor and update the controller using Apple and Android smartphones, tablets or other
compatible devices. No additional dongle or accessory required.
VE.Direct port and two VE.Can ports
Either communications port type can be used for a wired data connection to a GX device (e.g. Cerbo GX, Color Control GX) PC
or other devices. Note that only one port can be used at a time.
Device Display
A 4 line LCD backlit display that operational information including battery levels, solar yield, and system icons.
User I/O connector:
• Aux 1, 2 input
• Programmable relay
• Battery Vsense
• Battery Tsense
• Remote H & Remote L - Configurable
Configuring and monitoring with VictronConnect
Configure the solar charge controller with the VictronConnect app. Available for iOS, Android devices, as well as macOS and
Windows computers. An accessory might be required for some systems; enter VictronConnect in the search box on our website
and see the VictronConnect download page for details.
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2.3. Setup options
Adaptive three step charging
The MPPT Charge Controller is configured for a three step charging process: Bulk – Absorption – Float.
A regular equalization charge can also be programmed.
Bulk- During this stage the controller delivers as much charge current as possible to rapidly recharge the batteries.
Absorption - When the battery voltage reaches the absorption voltage setting, the controller switches to constant voltage mode.
When only shallow discharges occur the absorption time is kept short in order to prevent overcharging of the battery. After a deep
discharge the absorption time is automatically increased to make sure that the battery is completely recharged.
Additionally, the absorption period is also ended when the charge current decreases to less than 2A.
Float - During this stage, float voltage is applied to the battery to maintain a fully charged state.
Optional external voltage and temperature sensor
Wired connections are available for battery voltage and temperature sensing. The Solar Charger uses these measurements to
optimize its charge parameters. The accuracy of the data it transmits will improve battery charging efficiency, and prolong battery
life.
The Smart Battery Sense and other VE.Smart networking features are not currently supported.
Remote on-off input
On/off control by a VE.Bus BMS when charging Li-ion batteries.
Remote L functions as ‘allow to charge’ in case lithium battery is selected and remote H functions as ‘allow to discharge’. Use
smallBMS for the RS with Victron lithium batteries.
Programmable relay
Can be programmed (with a smartphone) to open or close on an alarm, or other events.
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3. Installation
3.1. Location of the MPPT
For best operating results, the MPPT should be placed on a flat vertical surface. To
ensure a trouble free operation, it must be used in locations that meet the following
requirements:
a) Do not expose to water, rain or moisture.
b) Do not place in direct sunlight. Ambient air temperature should be between -20°C
and 40°C (humidity & 95% non-condensing).
c) Do not obstruct airflow. Leave at least 30 centimeters clearance above and below
the MPPT.
When the unit is running too hot, it will shut down. When it has reached a safe
temperature level the unit will automatically restart again.
Figure 1. Thermal image of MPPT RS heat zones required for
clearance.
This product contains potentially dangerous voltages. It should only be installed under
the supervision of a suitable qualified installer with the appropriate training, and
subject to local requirements. Please contact Victron Energy for further information or
necessary training.
Excessively high ambient temperature will result in the following:
· Reduced service life.
· Reduced charging current.
· Reduced peak capacity, or shutdown of the MPPT.
Never position the appliance directly above lead-acid batteries. The MPPT RS is
suitable for wall mounting. For mounting purposes, a hook and two holes are provided
at the back of the casing. The device must be fitted vertically for optimal cooling.
For safety purposes, this product should be installed in a heat-resistant environment.
You should prevent the presence of e.g. chemicals, synthetic components, curtains or
other textiles, etc., in the immediate vicinity.
Try and keep the distance between the product and the battery to a minimum in order to minimise cable
voltage losses
3.2. MPPT grounding and detection of PV array insulation faults
The RS will test for sufficient resistive isolation between PV+ and GND, and PV- and GND. In the event of a resistance below the
threshold, the unit will stop charging, display the error, and send the error signal to the GX device (if connected) for audible and
email notification.
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The positive and negative conductors of the PV array must be isolated from ground.
Ground the frame of the PV array to local requirements. The ground lug on the chassis should be connected to the common
earth.
The conductor from the ground lug on the chassis of the unit to earth should have at least the cross-section of the conductors
used for the PV array.
When a PV resistance isolation fault is indicated, do not touch any metal parts and immediately contact a suitably qualified
technician to inspect the system for faults.
The battery terminals are galvanically isolated from the PV array. This ensures that PV array voltages cannot leak to the battery
side of the system in a fault condition.
3.3. Battery and battery lead requirements
In order to utilize the full capacity of the product, batteries with sufficient capacity and battery cables with sufficient cross section
should be used. The use of undersized batteries or battery cables will lead to:
• Reduction in system efficiency.
• Unwanted system alarms or shutdowns.
• Permanent damage to system.
See table for MINIMUM battery and cable requirements.
Model
Battery capacity Pb 200 Ah
Battery capacity Lithium 50 Ah
Recommended DC fuse 125 A - 150 A
Minimum cross section (mm2) per + and - connection terminal 0 - 2 m 35 mm2
2 - 5 m 70 mm 2
Consult battery manufacture recommendations to ensure the batteries can take the total charge current of the
system. Decision on battery sizing should be made in consultation with your system designer.
Use a torque wrench with insulated box spanner in order to
avoid shorting the battery.
Maximum torque: 14 Nm
Avoid shorting the battery cables.
• Undo the two screws at the bottom of the enclosure and remove the service panel.
• Connect the battery cables.
• Tighten the nuts well for minimal contact resistance.
3.4. Solar array configuration
The MPPT RS contains seperate PV inputs. These are connected to independent Maximum Power Point Trackers. The strings
can be made of a different number or type of panels (though the same panels must be used on the same string).
The maximum operational input current for each tracker is 18A.
MPPT PV inputs are protected against reverse polarity, to a maximum short circuit current of 20A for each tracker.
Connecting PV arrays with a higher short circuit current is possible, as long as connected with correct polarity. This outside of
specification potential allows for system designers to connect larger arrays, and can be useful in case a certain panel
configuration results in a short circuit current just slightly above 20A, or to oversize the array to take care of winter versus summer
PV yield.
While functional with correct installation, BEWARE that the product warranty will be void if a PV array with a
short circuit current larger than 20A array is connected in reverse polarity.
You must keep the individual tracker inputs isolated from each other. That means one solar PV array per input,
do not attempt to connect the same array to multiple tracker inputs.
When the MPPT switches to float stage it reduces battery charge current by increasing the PV Power Point voltage.
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The maximum open circuit voltage of the PV array must be less than 8 times the minimum battery voltage when at float.
For example, where a battery has a float voltage of 54.0 volts, the maximum open circuit voltage of the connected array cannot
exceed 432 volts.
Where the array voltage exceeds this parameter the system will give a "Over-charge Protection" error and shut down.
To correct this, either increase the battery float voltage, or reduce PV voltage by removing panel from the string.
3.4.1. MPPT RS Example PV Configuration
This is an example of an array configuration. The decision on the specific array configuration, sizing and
design for your system should be made in consultation with your system designer.
Table 1. PV Array Example
Panel Type Voc Vmpp Isc Impp # of panels Max String Voltages Power total per
string
Victron 260W
(60 cell)
36.75 V 30 V 9.30 A 8.66 A # 1 - 11
#2 - 8
# 1 - 404 V
# 2 - 304V
2850 W
2080 W
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Figure 2. MPPT RS PV example diagram
418V and 304V DC PV Distribution
11 x 270W 60 cell panels in
series – 418 Voc
8 x 270W 60 cell panels in
series – 304 Voc
3.5. Cable connection sequence
First: Confirm correct battery polarity, connect the battery.
Second: if required, connect the remote on-off, and programmable relay, and communications cables
Third: Confirm correct PV polarity, and then connect the solar array (if incorrectly connected with reverse polarity, the PV voltage
will drop, the controller will heat up but will not charge the the battery). Torque: 2,4 Nm
3.6. Can bus interface
The solar charge controller is equipped with two VE.Can bus RJ45 sockets.
The CAN bus on this charger is not galvanically isolated. The CAN bus is referenced to the minus battery connection.
The CAN bus interface will be referenced to ground if the minus pole of the battery is grounded. In case of a positive grounded
system, a CAN isolation module will be needed to reference the CAN bus interface to ground. The end of a CAN cable should
have a bus terminator. This is achieved by inserting a bus terminator in one of the two RJ45 connectors and the CAN cable in the
other. In case of a node (two CAN cables, one in each RJ45 connector), no termination is needed.
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Supply voltage (V+ supply): 9V-70V
Maximum supply current: 500mA
Data rate: 250 kbps
CANH/CANL voltage tolerance: +/-70VDC
CAN transceiver ISO specification: ISO 11898-2:2016
To provide maximum flexibility, the battery voltage is used for the V+ supply line of VE.CAN. This means that all
equipment connected to VE.CAN are a permanent load to the battery.
3.7. Synchronised parallel operation
Several charge controllers can be synchronised with the CAN interface. This is achieved by simply interconnecting the chargers
with RJ45 UTP cables (bus terminators needed, see section 3.6).
The paralleled charge controllers must have identical settings (e.g. charge algorithm). The CAN communication ensures that the
controllers will switch simultaneously from one charge state to another (from bulk charge to absorption for example). Each unit
will regulate its own output current, depending on the output of each PV array and cable resistance.
In case of synchronized parallel operation, the network icon will blink every 3 seconds on all paralleled units.
The PV inputs should not be connected in parallel. Each charge controller must be connected to its own PV array.
3.8. Energy Storage System (ESS)
An Energy Storage System (ESS) is a specific type of power system that integrates a power grid connection with a Victron
Inverter/Charger, GX device and battery system. It stores solar energy into your battery during the day, for use later on when the
sun stops shining.
Please refer to the following manual how to setup an ESS:
https://www.victronenergy.com/live/ess:start
3.9. User I/O
3.9.1. Remote on/off connector
The remote on/off has two terminals: Remote L and Remote H.
A remote on/off switch or relay contact can be connected between L and H. Alternatively, terminal H can be switched by a
connection to battery positive, or terminal L can be switched by a connection to battery minus.
Special case for Victron lithium batteries in combination with the smallBMS. When Lithium is selected in the software, the remote
on/off is changed, and that physical interface instead becomes the connection point for the allow-to-charge and allow-to-
discharge wires.
The remote H input is the connection point for the allow-to-discharge control wire and must to be connected to the Load output of
the smallBMS. The remote L input is the connection point for the allow-to-charge control wire and must be connected to the
Charger output of the smallBMS. Remote on/off function is now taken over by the smallBMS.
3.9.2. Programmable relay
Programmable relay which can be set for general alarm, DC under voltage or genset start/stop function. DC rating: 4A up to
35VDC and 1A up to 70VDC
3.9.3. Voltage sense
For compensating possible cable losses during charging, two sense wires can be connected directly to the battery or to the
positive and negative distribution points. Use wire with a cross-section of 0,75mm².
During battery charging, the charger will compensate the voltage drop over the DC cables up to a maximum of 1 Volt (i.e. 1V over
the positive connection and 1V over the negative connection). If the voltage drop threatens to become larger than 1V, the
charging current is limited in such a way that the voltage drop remains limited to 1V.
3.9.4. Temperature sensor
For temperature-compensated charging, the temperature sensor (supplied with the unit) can be connected. The sensor is isolated
and must be fitted to the negative terminal of the battery. The temperature sensor can also be used for low temperature cut-off
when charging lithium batteries (configured in VictronConnect).
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3.9.5. Programmable analog/digital input ports
The product is equipped with 2 analog/digital input ports.
The digital inputs are 0-5v, and when a input is pulled to 0v it is registered as 'closed'
These ports can be configured in VictronConnect. For more information search Victron Community.
3.9.6. User I/O terminal diagram
Figure 3.
User I/O Connector is located on bottom left side of connection area, diagram shows 3 perspectives. Left Side - Top - Right Side
3.9.7. User I/O functions
Table 2. User I/O Functions - See Installation Section for more details.
Number Connection Description
1 Relay_NO Programmable relay Normally Open connection
2 AUX_IN - Common negative for programmable auxiliary inputs
3 AUX_IN1+ Programmable auxiliary input 1 positive connection
4 AUX_IN2+ Programmable auxiliary input 2 positive connection
5 REMOTE_L Remote on/off connector Low
6 REMOTE_H Remote on/off connector High
7 RELAY_NC Programmable relay Normally Closed connection
8 RELAY_COM Programmable relay common negative
9 TSENSE - Temperature Sensor negative
10 TSENSE + Temperature Sensor positive
11 VSENSE - Voltage Sensor negative
12 VENSE + Voltage Sensor positive
3.10. Programming with VictronConnect
This guide will help you with the specific elements of VictronConnect that relate to the MPPT Solar Charge Controller.
More general information about the VictonConnect App - how to install it; how to pair it with your device; and how to update
firmware, for example - can be found by referring to the overall VictronConnect manual. A list of all VictronConnect compatible
devices can be viewed here.
Note: These instructions can apply to different products and configurations, where battery voltage is referred to in these
instructions, a 12V battery is used as a reference point. Please multiply the given values by 4 to arrive at settings for an
installation configured for the 48V battery system.
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3.10.1. Settings
The settings page is accessed by clicking on the Cog icon at the top right of the Home page. The settings page provides access
to view or change the settings of the Battery; Load; Streetlight; and Port functions. From this page you can also view Product
information such as the Firmware versions installed on the MPPT Solar Charger.
3.10.2. Battery settings
Battery voltage
The RS is fixed to 48V, and is only available for 48V systems.
Max charge current
Allows the user to set a lower maximum charge current.
Charger enabled
Toggling this setting turns the Solar Charger off. The batteries will not be charged. This setting is intended only for use when
carrying-out work on the installation.
Charger settings - Battery preset
Battery preset allows you to select the battery type; accept factory defaults; or enter your own preset values to be used for the
battery charge algorithm. The Absorption voltage, Absorption time, Float voltage, Equalisation voltage and Temperature
compensation settings are all configured to a preset value - but can be user-defined.
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User-defined presets will be stored in the preset library - in this way installers will not have to define all the values each time they
are configuring a new installation.
By selecting Edit Presets, or on the Settings screen (with expert mode on or not), custom parameters can be set as follows:
Absorption voltage
Set the absorption voltage.
Adaptive absorption time
Select with adaptive absorption time or fixed absorption time will be used. Both are better explained below:
Fixed absorption time: The same length of absorption is applied every day (when there is enough solar power) by using the
maximum absorption time setting. Be aware that this option can result in overcharging your batteries, especially for lead batteries
and system with shallow daily discharges. See your battery manufacturer for recommended settings. Note: make sure to disable
the tail current setting to make the same absorption time every day. The tail current could end absorption time sooner if the
battery current is below the threshold. See more information on the tail current setting section below.
Adaptive absorption time: The charge algorithm can use an adaptive absorption time: it automatically adapts to the state of
charge in the morning. The maximum duration of the absorption period for the day is determined by the battery voltage as
measured just before the solar charger begins operation each morning (12 V battery values used - Multiply Battery voltage by 4
for 48V ):
Battery voltage Vb (@start-up) Multiplier Maximum absorption times
Vb < 11.9 V x 1 06:00 hours
> 11.9 V Vb < 12.2 V x 2/3 04:00 hours
> 12.2 V Vb < 12.6 V x 1/3 02:00 hours
Vb > 12.6 V x 2/6 01:00 hours
The multiplier is applied to the maximum absorption time setting and this results in the maximum duration of the absorption period
used by the charger. The maximum absorption times shown in the last column of the table are based on the default maximum
absorption time setting of 6 hours.
Maximum absorption time (hh:mm)
Set the absorption time limit. Only available when using a custom charge profile.
Enter the time value in the notation hh:mm, where hours are between 0 and 12; and minutes are between 0 and 59.
Float voltage
Set the float voltage.
Re-bulk voltage offset
Set the voltage offset that will be used over the float voltage setting that will determine the threshold that the charge cycle will
restart.
E.g.: For a Re-bulk voltage offset off 0.1V and a float voltage setting of 13.8 V, the voltage threshold that will be use to restart the
charge cycle will be 13.7 V. In other words, if the battery voltage drops below 13.7 V for one minute, the charge cycle will restart.
Equalization voltage
Set the equalization voltage.
Equalization current percentage
Set the percentage of the Max charge current setting that will be used when equalisation is performed.
Automatic Equalization
Set-up the frequency of the auto equalize function. Available options are between 1 and 250 days:
• 1 = daily
• 2 = every other day
• ...
• 250 = every 250 days
Equalization is typically used to balance the cells in a lead battery, and also to prevent stratification of the electrolyte in flooded
batteries. Whether (automatic) equalization is necessary, or not, depends on the type of batteries, and their usage. Consult your
battery supplier for guidelines.
When the Automatic equalization cycle has initiated, the charger applies an equalization voltage to the battery as long as the
current level stays below the equalization current percentage setting of the bulk current.
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Duration of the Automatic equalization cycle
In the case of all VRLA batteries and some flooded batteries (algorithm number 0, 1, 2 and 3) automatic equalization ends when
the voltage limit (maxV) has been reached, or after a period equal to (absorption time/8) - whichever comes first.
For all tubular plate batteries (algorithm numbers 4, 5 & 6); and also for the user-defined battery type, automatic equalization will
end after a period equal to (absorption time/2).
For the Lithium battery type (algorithm number 7), equalization is not available.
When an automatic equalization cycle is not completed in one day, it will not resume the next day. The next equalization session
will take place according to the interval set in the 'Auto Equalization' option.
The default battery type is a VRLA battery and any user-defined battery will behave as a tubular plate battery with regard to
equalization.
Equalisation stop mode
Set how the equalisation will end. There are two possibilities, first is if the battery voltage reaches the equalisation voltage and the
second is on fixed time, where the maximum equalisation duration is used.
Maximum equalisation duration
Set the maximum time that the equalisation phase will last.
Tail current
Set the current threshold that will be used to finish absorption phase before the maximum absorption time expires. When the
battery current gets below the tail current for one minute, the absorption phase will end. This setting can be disabled by setting it
to zero.
Temperature compensation
Many types of battery require a lower charge voltage in warm operating conditions, and a higher charge voltage in cold operating
conditions.
The configured coefficient is in mV per degree Celsius for the whole battery bank, not per cell. The base temperature for the
compensation is 25°C (77°F), as shown in the chart below.
With a temperature sensor installed to the User I/O connection block; the actual battery temperature will be used for
compensation; throughout the day.
Low temperature cut-off
This setting can be used to disable charging at low temperatures as required by Lithium batteries.
For Lithium Iron Phosphate batteries this setting is preset at 5 degrees Celsius, for the other battery types it is disabled. When
creating a user defined battery the cut-off temperature level can be adjusted manually.
Manual Equalization - Start now
Selecting 'Start now' on 'Manual equalisation' allows manual initiation of an Equalization cycle. To allow the charger to equalize
the battery properly use the manual equalize option only during absorption and float periods, and when there is sufficient sunlight.
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Current and voltage limits are identical to the automatic equalize function. The duration of the equalisation cycle is limited to a
maximum of 1 hour when triggered manually. Manual equalization can be stopped at any time by selecting 'Stop Equalize'.
3.10.3. Programmable relay
A programmable relay switch is available on some SmartSolar models. The datasheet for your model will tell you whether or not it
is available.
The relay offers three connections:
1. NO (Normally Open)
2. C (Common)
3. NC (Normally Closed)
Relay state Connection between
Switched ON C and NO
Switched OFF C and NC
The conditions for switching the relay depend on the relay mode setting, note that the conditions for switching over must be
present for at least 10 seconds before the relay will change position.
Relay mode
1. Relay always off. This option switches the relay OFF. It will disable the other relay options. Use this option if you do not plan
to use the relay function.
2. Panel voltage high. This option switches the relay ON when the panel voltage becomes too high. See Panel voltage high
mode settings below.
3. High temperature (Dimming). This option switches the relay ON when the charger output current is reduced due to high
temperatures. Use this option to for example switch an external fan.
4. Battery voltage Low. This option switches the relay in ON when the battery voltage falls too low, see Battery voltage Low
settings below. This is the default setting when the relay function is active.
5. Equalization active. This option switches the relay ON when the manual equalization mode is active.
6. Error state. This option switches the relay ON when there is an error.
7. Defrost option (Temp < -20 °C). This option switches the relay ON when the Charger temperature falls below -20 degrees
Centigrade.
8. Battery voltage high. This option switches the relay ON when the battery voltage is too high, see Battery voltage High
settings below.
9. Float or Storage state. This option switches the relay ON when the charger is in the float state.
10. Day detection (Panels irradiated). This option switches the relay ON whilst the solar panels are providing energy (Day/Night
detection).
Panel voltage High settings
1. Panel high voltage. (User-defined Voltage)
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2. Clear panel high voltage. (User-defined Voltage)
This option switches the relay ON when the panel voltage rises above the chosen “Panel high voltage” setting, and switches the
relay OFF when the panel voltage falls below the chosen “Clear panel high voltage” setting. Ensure, of course, that the “Panel
high voltage” setting is greater than the “Clear panel high voltage” setting. These settings must never exceed the maximum
voltage-rating allowed by your MPPT charger.
Battery voltage Low settings
1. Battery low-voltage relay. (The default setting for this is 10.00V) (12V battery assumed)
2. Clear battery low-voltage relay. (The default setting for this is 10.50V)
These settings, which can be user-defined, will cause the relay to switch ON when the battery voltage falls below the chosen
“Battery low-voltage” setting; and will cause the relay to switch OFF when the battery voltage once again rises above the “Clear
battery low-voltage” setting. Ensure, of course, that the “Battery low-voltage relay” setting is lower than the “Clear battery low-
voltage relay” setting.
An application for this feature, for example, is to automatically disconnect a load in order to prevent a battery from becoming too
deeply discharged.
Battery voltage High settings
1. Battery high-voltage relay. (The default setting for this is 16.50V) (12V battery assumed)
2. Clear battery high-voltage relay. (The default setting for this is 16.00V)
These settings, which can be user-defined, will cause the relay to switch ON when the battery voltage rises above the “Battery
high-voltage relay” setting; and will cause the relay to switch OFF when the battery voltage drops below the “Clear battery high-
voltage relay” setting. Ensure, of course, that the “Battery high-voltage relay” setting is greater than the “Clear battery high-
voltage relay” setting.
An application for this feature, for example, is to disconnect a load in order to protect it from an over-voltage.
General settings
1. Minimum closed time. (The default setting for this is 0 minutes)
This option sets a minimum-time for the ON condition to prevail once the relay has been switched ON.
An application for this feature, for example, is to set a minimum generator run-time.
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4. Operation
4.1. Device display
The unit has an LCD screen that displays operational information. The screen cycles through the relevant displays every few
seconds.
Startup Screen
When the units is first switched on it will display firmware, serial number and model details for severals while the unit performs
self tests.
Battery:
Battery Power, Current, DC voltage, Temperature (*). Battery state (e.g. discharging, bulk, absorption, float, etc).
(*) These items are only visible if the data is available.
Solar 1
Solar Power, Voltage and Current, kWh daily and total Yield.
Additional MPPT Solar Trackers
Additional solar trackers will display the same values as above where available on additional screens.
Errors, Warnings and Alarms
The system will display code notifications as required. See troubleshooting section for additional information.
In the top right of the display are other system information icons.
Communicating on any interface (e.g., Bluetooth, VE.Can,
etc.)
Bluetooth Enabled, Icon colour changes when connected
MPPT Active
(Blinking) Error or Warning
Battery, fill corresponds with voltage, blinks when empty
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4.2. STATUS - Live Data Information
•MPPT [Model Number] confirms the connected device. A custom name can also be set if desired.
•Solar 'Gauge' icon shows the dynamic real-time power output from the solar array. With regard to the Solar Panel voltage,
note that the Solar charger will only operate once the Panel voltage has risen more than 5V above battery voltage.
•Battery - Voltage The voltage measurement is taken at the battery terminals of the Solar charger.
•Battery - Current This reading shows the current flowing-to, or drawn-from the battery terminals of the Solar charger. Note that
in the case of the 100/20 Solar chargers and smaller - which have a dedicated load output - a Positive notation alongside the
current reading means that current is flowing to the battery; whereas a Negative notation means that current is being drawn
from the battery.
•Battery - State:
• Bulk: During this stage the Controller delivers as much charge current as possible to rapidly charge the batteries. When the
battery voltage reaches the Absorption voltage setting, the Controller activates the Absorption stage.
• Absorption: During this stage the Controller switches to the constant voltage mode, where a pre-set absorption voltage,
suitable to the battery type (See section 4.1 Battery Settings below), is applied. When the charge current decreases below
the Tail current and/or the pre-set Absorption time has elapsed, the battery is fully charged. The Controller switches to the
Float stage. The Tail current is 1A for models 100/20 and smaller; and 2A for larger models. (When an automatic equalisation
is being performed this will also be reported as 'Absorption'.)
• Float: During this stage the float voltage is applied to the battery to maintain a fully-charged state. When the battery voltage
drops below float voltage during at least 1 minute, a new charge cycle will be triggered.
• Equalization: This is shown when 'Start equalization now' is pressed in the battery settings. The charger applies the
equalization voltage to the battery as long as the current level stays below 8% (Gel or AGM) or 25% (tubular plate) of the
bulk current.
* Menu items only available on MPPT models with load output (100/20 and smaller.)
•Load output on/off The function of the load output switch is to disconnect the load when the battery is low on power in order to
avoid damaging it. See the configuration section (4.2 below) for available load switching algorithms.
•Load current This shows the current being drawn by electronic devices, lights, fridge, etc.
Note that for the load output reading to be reliable, all loads must be wired directly to the load output …including their negative
terminals. See manual or consult your installer for details.
Note that some loads (especially inverters) are best connected directly to the battery. In such cases the load output does not
show a reliable reading - the current drawn by the inverter, for example, will not be included. Consider adding a BMV battery
monitor which will measure all current going to - or being drawn from the battery, including loads connected directly to the battery
…not just the load output terminals of the charge controller.
Is my battery being charged?
The battery will be charged whenever the power available from the PV panels exceeds the power being drawn by the loads
(lights, fridge, inverter, etc.).
You can only tell if that is the case with Charge Controllers which have all loads connected to the load output terminals.
Remember: any loads connected directly to the battery can't be monitored by the Solar Charger.
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4.3. HISTORY - Thirty-day Graphic
(The fragmented square icon (top left) allows you to toggle between 'portrait' and 'landscape' screen presentations.)
A summary of activity for the last 30 days is presented graphically. Swipe the bar left or right to show any of the previous 30 days.
The daily log shows:
•Yield: The energy converted for that day.
•P max: The maximum power recorded during the day.
•V max: The highest voltage from the PV array during the day.
Clicking on any day/bar in the graph will expand the information to show charge-status times - both as hrs/m; and also as a
percentage of the 'charge' day. This graphic provides an at-a-glance representation of how much time your charger is spending in
each of three modes: Bulk / Absorption / Float.
Tip! You can use the charge times to see if the PV array is properly sized for your requirements. A system which never reaches
'Float' may need more panels; or perhaps the load could be reduced?
Figure 4. MPPT Tracker view
It is also possible to see a specific yield, maximum power, and maximum voltage for the individual trackers by selecting the
tracker tab in the history view (number of trackers vary by model -see product datasheet).
It is possible to export the history as a comma separated file (.csv) by clicking the three connected dots at the top right of the
history screen:
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