amberroot REhub 12/24-40 User manual
1 Ver 7.0 User Manual
REhub MPPT 12/24 – 40
Solar MPPT Charger for Upgrading Inverters
User Manual
Ver 7.0
Scan this QR code with your phone for a YouTube
link to a short video on installing REhub MPPT.
Amberroot Systems Private Limited, # 251/252, 3rd Main, 3rd Cross Road, JP Nagar 3rd Phase,
Copyright: Amberroot Systems Pvt Ltd. 2020. All rights reserved.
2 Ver 7.0 User Manual
Product Warranty
1. We warrant the original goods purchased for a period of 12 months after purchase.
2. Please register your device with the following Serial Number by sending a mail to
3. Warranty is invalid if the device is used other than as intended by the manufacturer.
4. Within the warranty period we will repair or replace at our option all failures which
are caused by material or manufacturing faults.
5. Amberroot will not be responsible for any consequential damage.
6. A warranty repair does not extend the warranty period.
Exclusions of Warranty
No warranty claims will be accepted for damages resulting from handling, use or treatment
that are not explicitly mentioned in this manual. In particular, damages arising from the
following causes are excluded from the warranty
1. Voltage higher than 90V across PV or battery terminals.
2. Battery cables connected across PV input terminals.
3. Accidental presence of liquids in the equipment or oxidation due to condensation.
4. Damage resulting from falls or mechanical shocks.
5. Opening the unit/lid or modifications carried out without the explicit authorization
of Amberroot Systems.
6. Damage due to atmospheric surge voltage (lightning).
7. Damage due to inappropriate transportation or packaging.
Company Seal
[SCAN for address]
Amberroot Systems Private Limited, # 251/252, 3rd Main, 3rd Cross Road, JP Nagar 3rd Phase,
3 Ver 7.0 User Manual
1Introduction
REhub enables adding Solar PV to existing backup solutions without the expense of
replacing the UPS/Inverter and batteries. REhub controls the charging of the batteries
from two sources –the Grid (charging by the existing UPS/Inverter) and the installed Solar
PV.
Adding Solar PV is the logical way to extend the backup hours and reducing the
dependence on Grid Power - but must be done the right way. REhub provides the right
combination for adding Solar PV. REhub intelligently controls the charging process in a
way that keeps the batteries safe and therefore extends their life. They allow the
maximal use of Solar power. The unit is based on a high efficiency MPPT (Maximum
Power Point Tracking) charge controller that maximizes the extraction of energy from
the PV panel.
2General information
2.1 About this User Manual
This manual contains all the necessary information and procedures to install, configure,
use and troubleshoot REhub Solar MPPT chargers for use with Inverters. It does not contain
information about Photovoltaic modules (PV) or Batteries or Inverters of various brands
that can be connected. For information of those devices, please refer to the instructions
of each specific manufacturer.
2.2 Important safety information
This manual contains important safety instructions. Read carefully the safety and operation
instructions before using REhub. Take into consideration all the warnings mentioned both
on the equipment & in this manual. Please follow all the instructions regarding the
operation and use.
This user manual is intended to serve as a guideline for the safe and efficient use of REhub.
This manual does not contain any information meant for persons other than the personnel
qualified for the installation of such a product.
The installation and commissioning of REhub must be entrusted to qualified personnel.
The installation and use must comply with the local safety instructions and standards in
force.
2.3 Symbols used in this manual
Table 1
This symbol is used to indicate safety instructions which, if not followed, could
result in serious personal injury or death to the operator or the user.
This symbol is used to indicate a risk of material damage and/or the cancellation
of the Warranty.
2.4 WARRANTY: PRESERVE THIS DOCUMENT FOR ANY WARRANTY
CLAIMS
The warranty for this equipment depends upon the strictly following the instructions in this
manual. This Manual Contains The Warranty Period And Terms In The Last Page. PLEASE PRESERVE
THIS DOCUMENT.
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2.5 Limitations of Liability
We disclaim all responsibility and liability for damage, costs or losses resulting from an
installation that does not comply with the instructions, a faulty operation or inadequate
maintenance. The use of REhub is in any case under the responsibility of the customer.
THIS EQUIPMENT IS NEITHER DESIGNED NOR GUARANTEED TO SUPPLY INSTALLATIONS
USED FOR VITAL MEDICAL CARE NOR ANY OTHER CRITICAL INSTALLATION ENTAILING
POTENTIAL RISKS OF DAMAGE TO PEOPLE OR TO THE ENVIRONMENT.
We assume no responsibility for the infringement of patent rights or other third parties
rights resulting from the use of the Charger.
Amberroot reserves the right to make any modifications to the product without prior
notification.
AMBERROOT IS NOT LIABLE FOR INCIDENTAL, DIRECT OR INDIRECT DAMAGES OF ANY
KIND, INCLUDING ANY PROFIT LOSS, REVENUE LOSS OR DAMAGES CAUSED TO
EQUIPMENT OR GOODS DUE TO DEFECTIVE EQUIPMENT.
3Installation
3.1 UNPACKING
When unpacking, check that the
equipment has not been damaged during
transportation and that all accessories
listed below are present. Any fault must
be immediately reported to the product
distributor or the contact mentioned at
the end of this manual.
Standard accessories: Installation and
operation manual. One Battery Cable,
10Sqmm, Black, 1 Meter long.
3.2 Where to Install
REhub must be installed on a flat wall
vertically. Keep the air vents clear of any
obstruction. Leave sufficient space around
the unit for air circulation.
Install in an area which is Protected from
any unauthorized person and children
•Protected from direct solar radiation or heat sources.
The presence of a heat source may significantly reduce its rated power. Similarly,
insufficient ventilation may lead to the overheating of some internal components of the
equipment. In this case, the device will automatically limit its power as long as this
abnormal situation persists. Do not expose REhub to any dripping liquids.
4Wiring
Figure 1 : Dimensions for Mounting
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Table 2 See Error! Reference source not found. in page Error! Bookmark not defined.
Wiring must be done by a professional qualified for such installations. Take extra care
while connecting High voltage systems, Battery terminals.
Take care to not connect the panels to the battery input or the connection of the batteries
to the PV input.
TAKE CARE not to connect the AC line to any of the DC (PV or Battery) connections.
REhub is intended to be connected exclusively to Solar Photovoltaic source. It is suitable
for charging any type of lead-acid batteries.
REhub is electronically protected against overloads, PV short-circuits, overheating, polarity
reversal of the battery, polarity reversal of the PV.
Access the cable compartment after
removing the L Plate.
Cable entry is through the slot in the L Plate.
Close the L Plate after the terminals are
sufficiently tightened and all the connections
are checked for correctness.
4.1 Components of the Cable Compartment
Table 3 ; See Error! Reference source not found. ( in the last page)
S/no
Description
Comment
1
Terminal to connect Solar -Ve
Ensure appropriate cable size is used and ends
properly crimped to avoid accidental shorts
from stray strands.
Ensure that the input Voltage and Current
(String sizing) do not exceed name plate
ratings.
Disconnect the connection between the Inverter
and Battery -Ve terminal, at the Battery -Ve
terminal, and connect to terminal #3
2A &
2B
Terminals to connect Battery +Ve and
Solar +Ve.
3
Terminal to connect to Inverter's Battery
-Ve
4
Terminal to connect Battery -Ve
5
External Temperature Sensor
Connect the External temperature Sensor (Part
to be purchased from Amberroot) for
temperature compensation of Battery charging
(Optional)
6
3 PIN,15 A Plug to connect AC input
from Mains
Connect this plug to Mains replacing the
existing Inverter connection
Figure 2 : L Plate to access Cable compartment
Remove this L Plate to
access cable
compartment
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S/no
Description
Comment
7
Socket to connect AC input of Inverter
Connect existing Mains-in Plug of the Inverter
to this socket
8
RJ45 Jack
Connect Amberlink©(available for purchase
separately) to this port.
9
Mode Select Switch
Use this switch to Select the way in which Mains
input to the Inverter is controlled.
4.2 Solar PV connections
REhub accepts input voltages between 0V to 90V. It can start charging the batteries when
the input voltage is above the battery voltage. Keep the connection ready. Close the
connections when you are ready to POWER Up.
4.2.1 Serial connection of Solar PV string
Table 4 : Maximum panels in a
string
REhub can operate at a much
higher PV voltage compared
to the Battery system
Voltage. It is therefore not
necessary to match the PV
panel voltage to the Battery
Voltage. However, the name
plate limits of the PV input
must be strictly followed.
To get the optimum Voltage, the solar modules shall be connected in series to form a
string having the desired voltage. The optimum operating voltage of the module string
(Vmpp) must always be above the battery Voltage.
To establish the minimum number of PV modules to be connected in series in the same
string, the max voltage of the battery must be multiplied by 1.1 and divided by the
modules Vmpp voltage.
For example, for a 24V system with a lead-acid battery with maximum Voltage of 30 V
and using PV panels with 17V Vmpp. 30*1.1/17=1.94.
The result must be rounded up to the higher value (i.e. 2 modules - of 17 Vmpp - in series
for the above example is the MINIMUM number of panels required for operation).
4.2.2 Maximum Panels in Series
The open-circuit voltage of the string must be lower than 90V under any temperature and
irradiation conditions.
To establish the maximum numbers of the PV modules connected in series in the
same string, use the following formula: 90V/(Voc). (Example: 90/(22)=4.09). The result
must be rounded down to the lower value (i.e. 4 modules - of 22 Voc - in series for the
above example).
There can be thus 4 PV modules in series of the mentioned model for a 24V system as per
this example.
Table 4 gives an idea of the possible arrangements for common panels according to the
number of cells or their type.
Note that CIS or other forms of THIN film PV modules cannot be connected to REhub
unless their Voc is <90V.
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4.2.2 Parallel connection of Solar PV string
To get the required charging power, 2 or more strings are usually to be connected in
parallel. Each string connected in parallel must be composed by the same number of
modules of the same type.
The number of strings connected in parallel
depends on the Isc of each string. The Isc of the
array must be < 30A for REhub MPPT, 40A
Version. When you need to determine the Isc of
the parallel array, it is the Isc of each panel
multiplied by the number of parallel strings. For
example, if the Isc of the panels used in the
system is 4A. The maximum number of Parallel
strings →30A/4A =7.5: Round down to the lower
value →7 Parallel strings.
The total power of the array can be slightly higher
than rated power of REhub. This excess capacity
is designed in to get the desired charging power
under all circumstances of Solar radiation.
However, the output current from REhub will be
limited to the maximum rated current. (This is
40A in REhub-12/24-40 models)
4.3 Cable Size
Based on Array arrangement, calculate INPUT
current. Choose the appropriate cable size for
INPUT current based on the length of the cable
from the PV panels to REhub. REhub must be
located close to the Batteries. Connect the PV
+Ve to Terminal [2] and connect PV -Ve to
Terminal [1].
4.4 Battery Connection
REhub monitors the net current delivered to the
Batteries. REhub is by default configured to
allow a maximum of 18A net current into the
batteries. What this means is that the sum of the
negative currents (currents drawn by the loads)
and the positive currents (currents delivered by
Solar PV and Inverter) will be not more than 18A.
This is ideal for Battery size of 150Ah –typical
home back up Batteries. This value can be
changed through Amberlink. (separately
available for purchase). There are two
connections to the batteries from REhub.
Connections [2] and [4] deliver the Solar charge
to the batteries. Connections [3] is to monitor the
battery currents. The existing Inverter battery -
Ve connection to battery must be disconnected
and connected to REhub terminal [3]. Keep the
Inverter in switched off / Away mode till you are
ready with all connections. Do not close the
Battery connections till you are ready for POWER
UP.
Check to make sure LINE &
Neutral are NOT Swapped
Sometimes the LINE and Neutral is
swapped between the Input wire of the
Inverter and the Output Load socket.
Even with the swap prior to the
installation of REhub, the problem is
not seen because the Inverter delivers
output from the batteries only when
the Mains are not available. So, a Line-
Neutral swap from input to output is
not noticed
However when the Inverter's Mains
input is connected to REhub with the
LINE –Neutral swapped between AC
input and output Load and when
REhub forcibly switches off the MAINS
input to the Inverter (even when
MAINS power is available in the
daytime when Solar is available), the
Output Load may get dangerously
high voltage, because the Inverter is
delivering output from the Batteries
and the MAINS is also available.
Sometimes, the Neutral wire is
connected to the Live input of REhub.
REhub operates by switching off the
Mains input to the Inverter. This
operation will not happen if the
Neutral is connected to the Live input
of REhub because the relay then is
switching ON or OFF the Neutral line
and not the LIVE!
Always make sure that the Input to
Output LIVE pins have continuity and
that LIVE and Neutral are not swapped
in the Inverter.
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Note: Do not use a washer between the Battery lugs and the terminal [3]. Allow direct
contact of the lugs to the terminals to reduce resistance.
4.5 Inverter Connection
REhub is meant to add SAFE Solar PV to existing Inverters. The Mains input LIVE of the
Inverter is controlled by REhub. Disconnect the Mains to Inverter connection plug and
connect to the REhub Socket [7]. Connect MAINS input cable [6] to Mains Live input. The
rated Load current of the connected Inverter MUST be less than 100A. Keep the Inverter
in Away/ Off mode till you are ready for the Final Power UP
.
5Screens and indications
REhub has a 16X 2 LCD screen and three LED indicators. The display scrolls through various
screens and is a useful indicator for details on what is happening with the charger. The LED
indicators give a quick status update.
5.1 Information provided on the LCD screen
5.1.1 Start-up screens
Make sure that the correct battery system voltage is recognized (Example screen shows unit
connected to 24V battery system). If the unit is connected to 12V battery system, the last screen
must show the battery system voltage as 12V.
5.1.2 Display screens
The display scrolls through the screens shown above. Solar is Y if available. Mains is Y if available.
Mains to Inv is Y if the Mains input to the Inverter is ON. The + / - sign indicates that a counter is
running which will change the state from Y to N .
The Battery status screen shows the Net Amps delivered to the batteries and the battery Voltage.
By default, the maximum +Ve current to the batteries is set to 18A. A negative value indicates that
the Load is higher than Solar, and the Amps shown in being drawn from the batteries. The Solar
output screen shows the Output Amps and the instantaneous Power generated. The external
temperature value is used for Temperature compensated battery charging. This value is shown only
of the external temperature sensor is connected to the unit.
The ‘Energy’ screen shows the Cumulative energy generated by Solar PV.
REhub MPPT
Amberroot Sys
Model 0b2
12/24V –40A
Ver:0x035 DB:24
SL # 0b200526
Battery System
Voltage 24V
Solar Y Mains Y
Mains to Inv: Y +
Battery
27.45V + 13.5 A
Solar Input
71 V
Solar Output
96.07W 3.5 A
Int temp 36’C
Ext temp 28’C
Solar Unit
12 kWhr
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When the unit is set to a mode other than Auto, one of the following screens is additionally shown
in each cycle.
5.2 Mains Relay Operation Control: Switching Between Forced ON and
Auto Control.
REhub by default is in Auto control of the Mains Switch. REhub decides to switch off the
AC Mains input to the Inverter based on the availability of Solar energy and the state of
charge of the batteries. This forces the Inverter to use Solar energy to service the Loads.
Similarly, REhub auto restores the Mains connection when there is no Solar energy or the
state of charge of the batteries is below a set value. As a user you can decide to OVERRIDE
the decision of REhub by forcing REhub to keep the Mains switch ON. In ONAlwas (For On
Always) mode, REhub keeps the Mains ON at all times. In ON1Day (for ON One Day) mode,
REhub keeps REhub ON for the next 24 Hours and goes back automatically to Auto Mode
at the end of 24 Hours. These Override modes may be required in case the day is very
cloudy and Inverter is toggling frequently between using Solar and using the Mains to
power the load. Alternately, this may be required if heavy loads like Mixer-grinder is
connected to the lighting circuit supported by the Inverter. When running a Mixer, switch
to ONAlwas or ON1Day mode when power is available, to ensure the Inverter is not
delivering power from the batteries to the Mixer. Make sure to switch back to Auto when
the desired usage is completed.
Offgrid mode is a special mode in which the MAINS power is not used unless the battery
voltage goes very low. In Offgrid mode, REhub does not switch on the Mains input to the
Inverter even if Solar is not available. This mode is different from the Auto mode in the
way REhub switches on the Mains input to the Inverter. In Offgrid mode it automatically
switches on the Mains input only when the battery voltage reaches a set low value.
The different modes can be changed using the Mode button. Changing Mode using Mode Switch.
Press and hold the Mode select switch. The unit will display the mode it is in <Brackets>.
By default, the unit will be in Auto Mode. If you continue HOLDING the Mode select button
in pressed position, the next option moves to the bracketed position. Releasing the button
now will select that option. Continue pressing the switch and the display cycles through
the three options. REhub will move to the Mode that is in bracketed position when the
button is released.
When a Mode is selected you will get a confirmation screen indicating the mode in which
REhub is functioning now.
When the unit is set to Auto –the following screen is shown at the time of transition only
Mains Mode
OnAlwys
Mains Mode
On1Day
Mains Mode
Offgrid
Mains Setting
(OnAlwys) >On1Day
Mains Setting
(Auto) > OnAlwys
Mains Setting
(On1Day) > Offgrid
Mains Setting
(Offgrid) > Auto
Mains Mode
Auto
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6Powering Up
It is not mandatory to connect the terminals in a particular order. However, connecting
the battery terminals will energize and start the unit. Therefore, COMPLETE THE OTHER
CONNECTIONS BEFORE CONNECTING THE BATTERIES. Keep the -Ve Battery cable from
REhub open till the last when you are ready to power up. Before energizing the equipment,
recheck the polarity and the connections. Keep the MAINS MCB switched off.
A. Completing the PV+ and PV - connections.
Check the voltage between PV+ and PV- wires before closing the PV -ve. You will get a
voltage approximately equal to the open circuit voltage of the array.
Note if the installation is being done in the night you will not get the Voc value but likely
to get a Voltage much lesser.
B. Connecting the battery: On the BAT+Ve and BAT-Ve terminals.
Remove the cable from the battery -Ve terminal of the Inverter from the battery terminal
and connect to REhub.
Check the battery terminal voltage. Make sure you have chosen the right battery system
voltage for the REhub.
A 12V battery system will have voltage between 10.8V to 14V. A 24V battery is likely to
have a Voltage between 22V and 28V. On first time power on REhub will go to Auto Detect
Mode
C. Connecting the AC live from Mains connection.
Switch on the AC MCB. Put the Inverter to normal mode. Do this after REhub MPPT
recognizes the battery system voltage and starts functioning. IF YOU GET A BATT
PROTECTION TRIP ERROR –wait and the unit recovers and starts up again.
Take care not to swap Solar PV and Battery connections. The unit is not protected for
such a swap. The unit will not power up if batteries are connected in reverse polarity. If
PV polarity is swapped, the unit will show Solar as 'LOW'.
7Battery Charging Routine and REhub Operation
7.1 REhub Operation
REhub prioritizes keeping the batteries charged for sufficient back up. There are two
sources of energy to deliver power to the batteries. Solar PV panels and the Grid Mains
through the back up Inverter. REhub extracts power from the Solar Panel using a high
efficiency MPPT based charger. MPPT stands for Maximum Power Point Tracking and the
unit extracts power from the Solar panels at the voltage and current that delivers the
maximum power (called the Maximum Power Point). Since this Maximum Power voltage
and current Varies, the Unit uses sophisticated algorithms to 'Track' this maximum power
point. Additionally, REhub allows the conversion of existing Inverters to Solar based
systems. REhub does this by controlling the Mains Input to the Inverter and monitoring
the net current delivered to the batteries. At all times, REhub ensures that the batteries
are kept absolutely safe and maximum Solar power is used to power the Loads. REhub is
designed to work with Inverters of any make (12V or 24V). However, it is advisable to use
REhub with efficient, Pure Sine Wave Output Inverters.
Determine the approximate Loads (daytime Load connected to the Inverters) and match
the number of Solar panels installed so that the energy generated per day is approximately
equal to the energy consumed by the loads for best results with your Solar addition.
REhub functions in the following manner:
•When Batteries are discharged –the batteries are charged using both the Solar PV
and Grid if Mains power is available.
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•When Solar is available AND Batteries are nearly completely charged (Voltage of
13.5V/27V for at least 5 minutes), the GRID based charging from UPS Inverter is
cut off and Loads and Charging to the batteries are supplied from Solar PV.
•When Solar Power is unavailable OR the Battery Voltage drops to 12.5V/25V and
remains in this state for at least 5 minutes, the Mains Input to the Inverter is
switched on again
•If the Battery is seen to be discharging too fast, the Mains Input to the Inverter is
switched on again
REhub ensures that the NET current delivered to the batteries at all times is 10% to 15%
of the Battery Ah. The unit is by default configured to work with 150Ah batteries. Note
that when Loads are being serviced from Solar and Batteries, the Solar charger could be
supplying the current required by the Loads. Yet the net Current allowed into the batteries
will always be lesser than or equal to 15% of Battery Ah. The battery Ah setting is a
Factory setting. You can change this value through the data port by purchasing a Data
cable 'Amberlink' to access the data base of the system. The configuration using Amberlink
is given in a separate manual available with Amberlink.
7.2 Battery charging stages
REhub follows a three-stage charging from the Solar PV.
•Bulk mode: As much current as available and permissible for the batteries is
delivered to the batteries
•Float mode: The batteries are charged. Only as much current as need to keep the
batteries charged completely is delivered.Absorb Mode: The unit keeps the battery
Voltage constant till the Current absorbed by the battery is lesser than 1A.
8Error conditions
When an error occurs, REhub displays the error on the screen. Some errors are self-corrected and
once the error condition disappears, REhub resumes operation. Some errors may be system errors
that require correction in the system for recovery. In case you need support, please capture an
image of the error screen (and the next screen) for easier debugging.
Solar Power output is based on the
following factors
•Availability of Solar Power –depends on Solar irradiance.
•
Battery state of charge –When Batteries are in Bulk mode, the Solar charger limits
the Current to the batteries to a maximum of 18A. In Absorb or Float mode, the
batteries determine how much current is allowed.
•
State of Load. If the Batteries are full and Load is limited the Solar power has
nowhere to go and will therefore be limited. When loads go up, Solar power ramps
up (Subject to availability) and when Solar power alone cannot service the loads,
battery is discharged to service the loads along with Solar PV.
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Bat Prot Trip : Sudden surge or voltage change is observed in the battery terminal. The
next screen could indicate the error # and the Battery Voltage. If possible capture the
details of this screen to help us zero in on the problem faster.
High Temperature: Sustained Internal temperature beyond normal operating temperature.
Could indicate the Fan is nonfunctional.
Given below are some error conditions and what to do when you get them.
Error
Possible Reasons
Error Messages
Ways to eliminate
No Display
Batt Not On Or not connected
None
Turn on Battery
Battery Reverse
None
Check and connect
correctly
Battery Over Voltage
None
Check Battery Voltage
Zero
Charging
Current
PV Not Connected
Solar V is Less than
Bat V
Connect PV
PV Reverse/Shorted
None / Solar Low.
Check and correct PV
Internal Error due to PV panel
Overcapacity
Error in System –
Prot Trip
Reduce PV Capacity /
Wait
Internal Error due to transients
arising due to long battery cables
Error in System –
Prot Trip / Batt Prot
Trip.
Reduce battery Cable
length / Wait.
Internal Error due to transients
arising due to insufficient wire gauge
Error in System –
Prot Trip
Connect proper gauge
wire
Over temperature. (The unit cycles
through Charging and Tripping)
Error in System –
High Temperature
Wait for temperature to
reduce. Make sure there
is sufficient air
circulation. Also check if
PV panel connected is
more than what is
recommended.
PV Low/ Night time
Solar –Low
Wait for Sufficient
sunlight
Unit
getting
stuck in
System
Detect
Battery Voltage Very Low
None
Check the battery
health. Connect proper
12V or 24V Battery.
Error in System
Battery Prot Trip
Error in System
Err 12 61V
Error in System
High Temperature
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Error
Possible Reasons
Error Messages
Ways to eliminate
Battery
Protection
Trip
Battery is either deeply discharged
or Battery Voltage exceeds allowable
limit.
Batt Prot Trip
Unit will recover once
Battery Voltage goes
back to normal.
Not cutting
off Mains
Manual Override on
Mains Setting in '
Alwas On' or 1DayOn
Change to Auto Mode
No Mains
Mains not connected
Mains –N
Check and connect
mains
Power Cut
Mains –N
Wait for Power to be
restored
In Auto Mode
Mains –N
Switch to Manual
Override Mode if Mains
Power is required
In Offgrid mode
Inverter trips /
indicates Low Battery
Solar generation +
Battery back up is not
enough to tide over a
complete day
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9Specifications
Copyright 2020 Amberroot systems private limited.
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Quick reference guide for the installation of REhub
MPPT 12/24V 40A
Step 1 Prepare to connect: Keep the cables ready. Draw the PV +Ve and -Ve wires to the battery
room. Make provision to mount the REhub on a wall close to the batteries and the Inverter. Measure
and cut a 6 Sqmm cable (RED) for connection between REhub and battery. Crimp appropriate lugs
to the cable ends. Remove the Inverter's battery -Ve cable from the battery -Ve terminal
Step 2 Make the Solar connections: Measure Open Circuit voltage, ensure it is within REhub upper
limit, make the PV -Ve connection to REhub. Connect the PV +Ve and battery +Ve cable to the
common +Ve port on REhub.
Step 3A Make the battery connections: Measure the battery Voltage to make sure it is within the
operating limits of 12V or 24V battery system voltage. Connect the battery +Ve cable to the battery
terminal. Connect the Inverter's battery -Ve cable to REhub.
Step 3B Complete the battery connections and REhub starts up : Now connect the black 10Sqmm
cable provided with REhub to the battery -Ve terminal of the batteries. This will complete the battery
connections and REhub will start up.
Step 4 Make the Inverter's AC connections: Make sure there is no LIVE and Neutral Swap in the
Inverter's input and output. Connect the Mains Input of the Inverter to REhub. After REhub screens
shows that the battery system voltage is detected, connect the AC 3 Pin plug to Mains supply. Your
REhub installation is complete. Close the L plate once the system working is verified on the display
screen. WAIT till you see REhub switching off the MAINS input to the Inverter and the Inverter
indicates that it is in back-up mode.
Sl
no
Description
Desired Value
Measured
value
Verified
01
Check PV Voc Voltage using multimeter
Less than 90V
02
Check Battery Voltage using multimeter
12V System
(11 to 14.5V)
24V system
(22 to 29V)
03
Check the polarity of the PV wires. Connect PV
-Ve Wire to PV port and check for tightness.
04
Connect Battery and Solar positive to the
respective +Ve terminals on REhub. Check for
tightness.
05
Connect Inverter/UPS to Battery negative to
appropriate terminal in REhub. Check for
tightness
06
Connect Battery negative cable from REhub to
Negative terminal of the battery Check for
tightness
07
REhub starts up and does System detect.
Verify if correct battery Voltage is detected.
Correct battery
system Voltage
08
Make sure that LINE and Neutral wiring in
existing Inverter matches the Mains / house
wiring. Connect the Inverter Mains to REhub
and REhub to Mains input. Wait and confirm
that REhub switches off the Mains input to the
Inverter
Amberroot Systems Private Limited, # 251/252, 3rd Main, 3rd Cross Road, JP Nagar 3rd Phase,
16 Ver 7.0 User Manual
Figure 3 : Wiring Diagram
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