amberroot Rehub MPPT Eco-12 User manual

`
REhub-12/24-25
User Manual
Ver 3.0
REhub MPPT Eco
Solar Upgrade Made Viable
Important : WARRANTY :
PRESERVE THIS DOCUMENT OR
ANY WARRANTY CLAIMS
This Manual Contains The
Warranty Period And Terms.
PLEASE PRESERVE THIS
DOCUMENT.
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http://amberroot.com/blog/category/video/
Copyright : Amberroot Systems Pvt Ltd. 2020. All rights reserved.
Amberroot Systems Private Limited,# 251/252, 3rd Main, 3rd Cross Road,JP Nagar 3rd Phase,
Bangalore – 560078,Contact # : [phone] ,[email protected],www.amberroot.com

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 with us by sending a mail to
[email protected] for validating this Warranty certificate.
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:
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Amberroot Systems Private Limited,# 251/252, 3rd Main, 3rd Cross Road,JP Nagar 3rd Phase,
Bangalore – 560078,Contact # : [phone] ,i[email protected],www.amberroot.com

1 Introduction
REhub enables adding Solar PV to existing back up solutions that use UPS/Inverter and Batteries.
REhub controls the charging of the batteries from from two sources – the Grid (charging by the
existing UPS/Inverter) and the installed Solar PV. 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.
2 REhub MPPT Eco Operation
2.1 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. 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 (12V or 24V) of
any make. However it is advisable to use REhub with efficient, Pure Sine Wave output Inverters.
Determine the approximate Loads (day time Load connected to the Inverters) and match the
amount 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.
–When Batteries are >90% charged (Voltage >13.5/27V for at least 5 minutes) AND Solar PV
is available, the GRID based charging from UPS Inverter is cut off, Energy for the Loads and
Charging the batteries is supplied from Solar PV.
–When the Battery Voltage drops below 12.3/24.6V and remains in this state for at least 5
minutes OR Solar PV is unavailable, the Mains Input to the Inverter is switched on again.
The set points can be changed using a special cable 'Amberlink'.The configuration using Amberlink
is given in a separate manual available with Amberlink.
2.2 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
•loat mode : 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.
3 General in ormation
3.1 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
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about photovoltaic modules (PV) or batteries or Inverters of various brands that can be connected.
or information of those devices, please refer to the instructions of each specific manufacturer.
3.1 Important sa ety in ormation
This manual contains important safety instructions. Read carefully and follow all the safety and
operation instructions before using REhub. Take into consideration all the warnings mentioned both
on the equipment & in this manual. This user manual is intended to serve as a guideline for the
safe and efficient use of REhub. 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.
3.2 Symbols used in this manual
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.
3.3 Limitations o 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 OR
VITAL MEDICAL CARE NOR ANY OTHER CRITICAL INSTALLATION ENTAILING POTENTIAL RISKS O
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 OR INCIDENTAL, DIRECT OR INDIRECT DAMAGES O ANY KIND,
INCLUDING ANY PRO IT LOSS, REVENUE LOSS OR DAMAGES CAUSED TO EQUIPMENT OR GOODS DUE
TO DE ECTIVE EQUIPMENT.
4 Installation
4.1 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 to the contact
mentioned in the front page of this manual.
Standard accessories:
•Installation and operation manual.
4.2 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
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Drawing 1: Dimensions for mounting on wall

case, the device will automatically limit its power as long as this abnormal situation persists. Do
not expose REhub to any dripping liquids.
5 Wiring
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.
5.1 Components o the Cable Compartment
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. Refer wiring drawing 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.
2 Terminal to connect Solar +Ve
3 Terminal to connect Battery +Ve
4 Terminal to connect Battery -Ve
5 3 PIN,15 A Plug to connect AC input
from Mains
Connect this plug to Mains replacing the existing
Inverter connection
6 Socket to connect AC input of Inverter Connect existing Mains-in Plug of the Inverter to
this socket
7 Data Port Connect Amberlink© (available for purchase
separately) to this port.
8 Mode Select Switch Use this switch to Select the way in which Mains
input to the Inverter is controlled.
Table 1: REhub Terminals
5.2 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.
5.3 Serial connection o Solar PV 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
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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.
or 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).
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 P
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 2 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.
5.4 Parallel connection o 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. 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. or example, if the Isc of the panels used in the system is 4A. And the number of
Parallel strings is 4, then the Isc of the array is =16A.
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 25A
in REhub-12/24-25 models)
5.5 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].
5.6 Battery Connection
There are two connections to the batteries from REhub. Connections [3- Battery +ve] and [4 –
Battery -Ve] deliver the Solar charge to the batteries. 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
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Table 2: Maximum Panels in a String
Solar PV panels in a string
Min Max Min Max Min Max
12V 1 4 1 2 1 2
24V 2 4 2 2 1 2
36 Cell Solar
Panel with
Voc<23V
60 Cell Solar
Panel with
Voc<38V
72 Cell Solar
Panel with
Voc<45V
Battery
Voltage

for POWER UP.
5.7 Inverter Connection
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 60A. Keep the Inverter
in Away/ Off mode till you are ready for the inal Power UP.
6 Powering Up
Connecting the battery terminals will energize and start the unit. Do this last. Before energizing
the equipment, recheck the polarity and the connections. Keep the MAINS MCB switched off.
A. Connecting the battery: On the BAT+Ve and BAT-Ve terminals. 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
B. Completing the P + and P - 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 oc value but likely to get a
oltage which is much lesser.
C. Complete the Battery GND to Inverter connections and the AC live from Mains
connection.
Switch on the AC MCB. Put the Inverter to normal mode.
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 Battery is connected in Reverse Polarity. If PV Polarity is
swapped, the unit will show Solar as 'LOW'.
7 LCD Screen Indications
The Back light on the screen is ON by default when Solar is available & switches off when there is
no Solar energy. To Switch on the Back light when Back light is Off, press and release the Mode
Select switch for the back light to be switched on for the next 60 seconds.
7.1 Start-up screens
Make sure that the correct battery system voltage is recognized.
7.2 Display screens
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REhub MPPT
Amberroot Sys
Model 0X113
1 / 4V – 5A
Ver:0x03b DB:
SL # 00019
REhub MPPT Eco
Detecting System
Battery System
Voltage 4V
Solar Y Mains Y
Mains to Inv: Y +
Battery
7.5V
Solar Input
73 V
Solar Output
63 .5W 3 A
Int Temp:33’C
Solar Units
0.01Kwh

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 : This is controlled by Rehub based on the
state of charge of the batteries and availability of Solar Power. The + / - sign indicates that a counter is
running which will change the state from Y to N Or N to Y . Mains to Inv : Y means the Inverter and
Solar(If Solar is Y) are charging the batteries.
The Solar output screen shows the Output Amps and the instantaneous Power generated.
When Solar is unavailable, it is shown as LOW.
When you see L within brackets, this indicates that REhub is limiting the current output to keep
batteries safe. The current limit is by default set at 10A and is triggered when Mains is available and
Mains to Inverter is ON.
Both the Inverter and Solar charger are charging the batteries. The ‘Energy’ screen (Solar Units)
shows the Cumulative energy generated by Solar PV. The screen shows the total energy generated
from the Solar PV panels from the date of Installation. The value can be reset by disconnecting the
batteries.
The Int Temp is the Internal temperature of the Heatsinks.
When the unit is set to a mode other than Auto, one of the following screens is additionally shown in
each cycle.
7.3 Using Auto and Override modes in REhub.
REhub by default is in Auto mode. 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 ( or 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. In O Grid mode, REhub continues to keep
the Mains input to Inverter in forced O even when Solar is unavailable till the Battery reaches
12.5V/25V. 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.
7.3.1 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.
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Solar Output (L)
LOW 0.0A Solar Output (L)
56.5W 9.33A
Mains Mode
OnAlwys
Mains Mode
On1Day
Mains Mode
Offgrid
Mains Setting
(Auto) > OnAlwys
Mains Setting
(OnAlwys) >On1Day
Mains Setting
(On1Day) > Offgrid
Mains Setting
(Offgrid) > Auto

7.3.2 Errors and resolution
The Errors indicated in screen in REhub are typically self recoverable. However if you are repeatedly
getting certain errors please contact us.
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 an is non functional.
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.
Not cutting off
Mains
Manual Override on Mains Setting in ' Alwas
On' or 1DayOn
Change h 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 Off Grid Mode Mains - N Switch to Manual or Auto
mode if Mains power is
required
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Error in the system
Batt Prot Trip
Error in the system
High Temperature
Error in the system
Err 1 15.9 V

8 Speci ications
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Rehub MPPT Eco-12/24-25
Battery System Voltage 12 24
400W 800W
25A 25A
90V 90V
PV MPPT Voltage range 17-65 V 30-75 V
Input Current PV ( Max) 20 A
95% typ 95% Typ
ull load output voltage Same as battery voltage
loat Mode Charge Voltage 13.5 V ( actory Configurable) 27V ( actory Configurable)
Bulk Mode Charge Voltage 14.4 V ( actory Configurable) 28.8V ( actory Configurable)
Ambient temperature range -10°C to 60°C
Display
Dimension 200X120X95, IP20
Weight ~ 2 Kgs
Protections
Battery Reverse polarity Electronically protected
PV Reverse and Short circuit Electronically protected
Over current protection System shutdown, recovers with a timeout
Over temperature protection System shutdown, recovers with a timeout
Operating principle
High efficiency MPPT Based Solar Charger to enable
addition of Solar P to existing home inverters.
Maximizes the usage of Solar
Recommended Solar module
STC Wp
Output Current – Continuous,
Max
PV Open Circuit Voltage
(VOC)
Power Conversion Efficiency
(typical)
Ports
1PV -Ve input
1PV +Ve input
1Battery -Ve Input
1Battery +Ve
1 15A and 6A 3 Pin Socket
1 6A 1 Meter long wire with 3 Pin Plug
1 Mode Switch
1 Modbus port
16 X2 Backlit character LCD to display system state,
Instantaneous Power and cumulative energy generated from
Solar PV
a. It is possible to add more than the recommended Wp as long as the Voc limits are taken
care of. What would happen is that in periods when the Solar Panels deliver power more
than REhub's rated output, the output power is limited to that of the rated power. Since a
typical PV Panel delivers less than the nameplate Wp rating, installing PV more than the
rated power could be beneficial because then the continuous output is as per the rated
value.
Copyright 2019 Amberroot systems private limited.

Quick reference guide for the installation of Ehub MPPT
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.
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 to the PV +Ve terminal.
Step 3 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 battery -Ve cable to battery -Ve terminal.
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 Valve 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
respective terminals on REhub. Check for
tightness.
05 Connect Battery negative to appropriate
terminal in REhub. Check for tightness
06 REhub starts up and does System detect. Verify
if correct battery Voltage is detected.
Correct battery
system Voltage
07 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
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Wiring Drawing