The user / installation manuals for various REhubs

REhub DC that incorporates a DC load controller to power DC loads. “}” data-sheets-userformat=”{“2″:1049345,”3”:{“1″:0},”11″:4,”12″:0,”23″:1}”>Yes. Amberroot REhub chargers do not require the Grid connection to extract power from the panels or to charge the batteries.If your Loads are normal AC (Alternating Current) then you will require an Inverter to take power from the batteries to convert the DC ( Direct Current) from Batteries to AC. If your Loads are DC however, we have a different product  REhub DC that incorporates a DC load controller to power DC loads.

Yes,You can.The REhubs will combinedly give an higher Output. REhubs are specially suited for this purpose because of its Battery Net current monitoring feature. Even with a larger array to service the loads , you can still control the Net Positive current delivered to the Batteries.

Yes. They completely Designed by us and Manufactured in India.

REhubs have four selectable Modes of operation – [1] Auto, [2] OffGrid, [3] Mains Always, [4] On1Day . A Mode selection switch – allows you to toggle between the different modes. The Auto mode prioritizes use of Solar when it is available, the ONALWAYS and ON1day modes, use Grid power even if Solar is available, OffGrid Mode uses Solar and Batteries when Solar is available and after Solar becomes unavailable, continues to power the Loads from the batteries till the batteries reach a Voltage Set point. ( Low Voltage after which Grid power to the Inverter is restored.) Learn more about changing different modes < a href= ” https://youtu.be/K2SgtoyFh2o” > here </a>

Yes,it is possible to program the Solar charger to charge Lithium Ferrous Phosphate batteries. The Voltage set points are configurable. Configuration requires Amberlink isolated adapter ( <a href ” https://www.amberroot.com/monitoring-solar-installations/” Amberlink USB < /a> ) to connect to a Windows PC and Amberroot’s configuration utility. At the time of purchasing your REhub, please write to us with the desired set points and we will ship with the values requested. If you are already using the unit and wish to change the values, write to us and we can arrange this adapter on loan basis to make the changes. In any case, please make sure the Lithium batteries have integrated battery protection PCB ( BMS – Battery Management System)

The red button is used for changing 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 an 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. In OFF Grid mode, REhub continues to keep the Mains input to Inverter in forced OFF 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.

NO,REhub Solar chargers have minimal noise while in operation. Power electronics devices use Inductors, Capacitors and Fans ( for cooling) . These components , specially the Inductors and Capacitors can make noise ( audible noise) during operation and our design ensures that this noise is minimal. The Fan’s noise is also kept to a minimum. However if you hear a noise which is unusal from the fan during operation – there could be a problem – which needs to be addressed. Contact us through the support page for help in addressing the issue.

REhub MPPT solar prioritizer have 3 charging stages.Bulk Absorb,Float. These are set for Lead acid batteries by default. If REhubs need to be used with Lithium Batteries, the set points need to be changed as per the battery data sheet and float stage needs to be disabled. We can help you do that.

No.REhub MPPT solar controller does not display incoming current from the solar panel, It displays Solar input Voltage, Solar output Current, Output Power, and Mains availability.Please refer to this < a href= ” https://youtu.be/0NA9Cfti9Xg” > video </a> that explains the different display screens for more details

REhub MPPT solar charge controllers have an extensive list of parameters and set points that can be configured as per the customer’s requirement . This configuration is possible using Amberlink.

Yes ,Amberoot solar charge controller ( DC versions) can be configured for switching on and off the loads for a dusk to dawn operation.

Yes REhub MPPT charge controller is configurable for this purpose. This type of batteries have beend used for a research project at IIT Chennai – where REhub MPPTs have been used.

Cash on delivery is possible when ordered through Amazon / Flipkart and other E-commerce sites where our products are listed

May be possible through CARD payment options.

Yes REhub 48V can be used for Solar E-rickshaws,but better option is REvive MPPT Boost,Which is specially made for Solar Erickshaw applications. In this application, because of the limitation of the roof space on the erickshaws, the Panel Voltage is likely to be lesser than the Battery Voltage. REvive MPPT boost helps charging a higher Voltage Battery from a lower voltage solar PV panel

OFFGRID mode is more useful when your whole day energy consumption is less than the daily generation form your solar Installation and you have sufficient battery capacity to sustain the loads through the non -solar hours.

No,Battery must have BMS for safety.

IP20. The REhubs are meant to be installed in a well ventilated place, indoors , not exposed to rain / water and direct sunlight.

No ,Array VOC should be less than specified value of REhub specification sheet.

If the inverter negative is connected to the battery the full rated output current without any limitation will flow into the battery if adequate solar power is available.

The RJ45 jack in the REhubs is a RS485 – Modbus port. This is NOT AN ETHERNET connector. The usage of the port requires Amberlink for data monitoring or configuration of the parameters.

You can purchase REhub from our buy page < a href= ” https://www.amberroot.com/shop” >

We have stopped manufacturing PWM chargers . In most applications the MPPT equivalents are more cost efective for the user. However if you insist on using REhub PWM in your application , please contact us

Users can buy REhub solar charger from our website directly or through other e-commerce sites like Amazon / Flipkart. The price of the units are listed in the website for direct purchase. < a href= ” https://www.amberroot.com/shop” >

MPPT efficiency of REhub > 99% , full conversion efficiency is typically about 95%.

Let us look at two scenarios. REhubs switch off the Mains Input to the Inverter when the Solar is available and the Battery Voltage reaches a setpoint -Vh ( dafault value is 13.5V) and switches of the Mains input when the battery Voltage drops to Vl ( default value is 12.25V) or Soar is unavailabl.e.
Scenario [1] : Solar Power is Y and Mains is Y. (Actual condition at this instance )
Battery V is > Set value : When both Solar is Y And Battery V is > Set value – The Mains input to the Inverter is SWITCHED off by REhub. The loads are running from Battery and Solar. If Solar energy is more than what the Load requires, the Battery is getting charged depending on the battery Voltage. If Solar is less than what the Load requires, the batteries supply the balance. Here the battery is acting as a buffer between the Loads and Solar PV. Also note that availability of Mains is a ‘dont care’ situation here.
Scenario [2] Solar Power is Y and Mains is Y.
Battery V is <Set value : Here let us assume that the battery V has still not reached the set value from since Solar is Y in the morning. In this case the Mains input to the Inverter is still ON . So if Mains is available then the Loads are run from the Mains and battery is getting charged from solar and Mains. In this REhub nodel ( REhub MPPT Eco) , the Solar output is limited to 10A when both the Mains and REhub are charging the batteries. This limit is removed when the Battery V reaches the Set V and Mains to Inverter is switched off. If Mains is not there, the Battery and Solar are delivering energy for the Loads.

No REhub MPPT 12/24V 40A is an OFFGRID solar charge controller which cannot work without battery. The output of the Solar charger is based on the Battery Voltage.

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 .

Battery Net Current Monitoring and Control : REhub has an extra battery Terminal : to which the Inverter’s Battery -Ve cable is connected. This port monitors the net current delivered to the batteries – and therefore the Loads ( through the Inverter) can get as much current as possible from the Batteries and Solar Yet the Net Positive current delivered to the batteries is limited to what is safe for the batteries. To give you an example, let us say that you have 150AH batteries. If you carefully read the battery manual, you will notice that the battery manufacturer recommends a maximum of 10% to 15% of the battery AH as the Charge rate to the batteries. However , you may require Solar Panels that can deliver say 40A current to meet your load requirements. If the Load is not there and Battery is in Bulk charge mode, with other chargers, all the available current just flows into the battery. This does not charge the battery faster ( If this were possible, we will all be driving E-Vehicles with Lead acid batteries by now). Only the Battery reaches its gassing Voltage, heats up, loses Electrolyte etc. In REhub however because of the Battery net current monitoring and control, the net positive current delivered is controlled to what is safe for the batteries. So you get real back up and utilization of the installed Solar energy.

Thank you for asking this question. I will give you three reasons why REhub 12/24V 40A solar charge controller is a better Solar Charge controller than any other charger in the market
[1] Battery Net Current Monitoring and Control : REhub has an extra battery Terminal : to which the Inverter’s Battery -Ve cable is also connected. This port monitors the net current delivered to the batteries – and therefore the Loads ( through the Inverter) can get as much current as possible from the Batteries and Solar Yet the Net Positive current delivered to the batteries is limited to what is safe for the batteries. To give you an example, let us say that you have 150AH batteries. If you carefully read the battery manual, you will notice that the battery manufacturer recommends a maximum of 10% to 15% of the battery AH as the Charge rate to the batteries. However , you may require Solar Panels that can deliver say 40A current to meet your load requirements. If the Load is not there and Battery is in Bulk charge mode, with other chargers, all the available current just flows into the battery. This does not charge the battery faster ( If this were possible, we will all be driving E-Vehicles with Lead acid batteries by now). Only the Battery reaches its gassing Voltage, heats up, loses Electrolyte etc. In REhub however because of the Battery net current monitoring and control, the net positive current delivered is controlled to what is safe for the batteries. So you get real back up and utilization of the installed Solar energy.
[2] 90V ( Updated : Latest models now support 110V) Open circuit for even 12V Battery system Voltage. With 90V Open circuit support, you can connect 2 X 72 Cell panels ( Say 2 numbers of 300Wp) in series to the 12V battery. This results in power coming into the unit at higher Voltage and Lower Current. Lower current means lesser I2R losses. Also higher Voltage provides more headroom for charging even under cloudy conditions. 72 Cell panels ( called 24V panels in Market parlance) cost significantly lesser per Wp compared to 12V panels. You save on system cost and get better output with REhub.
[3] Our 40A rating is CONTINUOUS rated. Which means depending on your Load distribution through the day, you could be connecting more panels , whose Peak output can exceed 40A , yet REhub will safely limit the output to 40A and run with output of 40A through the day if required.

Beyond this : The product is COMPLETELY designed, manufactured in INDIA with cutting edge Power electronics that deliver higher efficiency in a smaller package ( Higher Power density)

Yes you can connect two 390W panel of Voc 49V in series with 12V battery if Voc of the panel is less than Voc of Rehub(This is available in specification sheet) .

REhub will safely limit the output to its rated current. Since REhub delivers a maximum of 40A output, when you connect 1200Wp Solar panel ( Which will have a peak output of about 80A with 12V battery system) you will end up limiting the output to 40A . That is , at every instance you are extracting more POWER but the output does not exceed the rated output of REhub. If you want to utilize the complete output however, we suggest that you use two REhub 40A units. With our suggested wiring, the units together will make sure that the net current to the battery is limited based on the AH of the battery and yet the loads get the full output as required .

REhub 12/24V has an extra Battery -Ve Terminal. The NET positive current (the charging current) to the batteries can be set as per the Battery Ah .( any value between 0A to 60A ) .The battery Net current monitoring feature limits the battery Current as per the setting .
Now let us say Solar generation is 40A. The Battery Charge current setting is say 18A. Then only 18A maximum will be used to charge the batteries after the loads are taken care of. If this setting is say 40A then 40A can be used to charge the batteries after the Load current is taken care of. Typical Lead acid batteries recommend 10% of Battery Ah and a maximum of 20% of battery Ah as charge current. Pushing more current ( Higher charge rate)does not charge the Lead acid batteries faster. The Batteries reach gassing Voltage faster which is not the same as battery getting charged.

As you can see – no other Solar charger in the market provides any cable at all.
REhub 12/24V 40A does Battery net current monitoring. To do this, the Inverter’s battery negative cable is connected to REhub. Battery net current monitoring allows you to size Solar as per your actual energy needs and use Battery as a buffer. The net Positive current delivered to the batteries is limited based on Battery Ah, allowing for safe charging of the batteries. Since the wiring is done in this fashion, the current exceeds 40A rated from the charger. The user may not have planned for this ampere rating and therefore, we provide the cable. However the Battery +Ve cable still carries not more that 40A . And the user/ System integrator can plan for this output.
We can provide Battery +Ve cable also at a nominal price if you write to us. Customers have purchased from us directly accessories like External temperature sensor , Amberlink Wi-Fi for remote monitoring etc. Do write to us for more details

Yes, the REhub DC models support Dusk to dawn operation.

All REhubs start up when Battery connection is made. If you make the battery connection first, the REhub is looking for Solar Voltage and since the Solar Panels are yet to be connected , decides that SOlar is unavailable and goes to a long sleep. Connect the Solar Panel fisrt and finish by connecting the battery connection to get REhub to start up immediately..