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Amberroot

Solar Pump Drives now available for PMSM , AC Induction and Solar Induction motors

REhub DC are Solar MPPT Chargers with Integrated DC Load Controllers

The Loads are connected to the DC Load controllers – which provide functions like Dusk to Dawn, Low Voltage Disconnect and Short Circuit protection.

Solar Charge controllers with Load controllers are available for small Street Light applications. When the Current and Voltage requirement becomes higher (e.g 48V and 30A), Electro-Magnetic relays become expensive (DC relay) or unavailable. REhub DC’s have high efficiency Mosfet based switching to control the Loads.

Specifications

Operating principleHigh efficiency MPPT Based Solar Charger with DC Load controller. High efficiency MPPT Based Solar Charger with DC Load controller. High efficiency MPPT Based Solar Charger with DC Load controller. Monitors the net battery current delivered to the batteries to ensure optimal charging rate and maximizes the usage of SolarHigh efficiency MPPT Based Solar Charger with DC Load controller. Monitors the net battery current delivered to the batteries to ensure optimal charging rate and maximizes the usage of SolarHigh efficiency MPPT Based Solar Charger with DC Load controller. Monitors the net battery current delivered to the batteries to ensure optimal charging rate and maximizes the usage of SolarHigh efficiency MPPT Based Solar Charger with DC Load controller. Monitors the net battery current delivered to the batteries to ensure optimal charging rate and maximizes the usage of Solar
Solar
REhub MPPT Eco 12/24V
REhub MPPT Eco 12/24V
REhub MPPT 12/24 - 40A
REhub MPPT 12/24 - 40A
REhub MPPT 36
REhub MPPT 48
[1]Battery Voltage detectionAuto detects 12/24VAuto detects 12/24VAuto detects 12/24VAuto detects 12/24V36V 48V
[2]Battery System Voltage 12Vnom24Vnom12Vnom24Vnom36Vnom48Vnom
[3]Recommended Solar module STC Wp500W1000W700W1400W1400W2500W
[4]Output Current – Continuous , Max25A25A40A40A30A40A
[5]PV Open Circuit Voltage (VOC)90V90V90V90V90V150V
[6]PV MPPT Voltage range> Battery Voltage to VoC limit of charger> Battery Voltage to VoC limit of charger> Battery Voltage to VoC limit of charger> Battery Voltage to VoC limit of charger> Battery Voltage to VoC limit of charger> Battery Voltage to VoC limit of charger
[7]Power Conversion Efficiency (typical)91% typ95% typ91% typ95% typ95% typ95% typ
[8]Full load output voltageSame as battery voltageSame as battery voltageSame as battery voltageSame as battery voltageSame as battery voltage
[9]Float Mode Charge Voltage (Configurable)113.5V27V13.5V27V40.5V54V
[10]Bulk Mode Charge Voltage14.4V28.8V14.4V28.8V43.2V57.6V
[11]Battery Charging states3 Stage for Lead acid. Configurable for other chemistries like LiFePo44 Stage for Lead acid. Configurable for other chemistries like LiFePo45 Stage for Lead acid. Configurable for other chemistries like LiFePo46 Stage for Lead acid. Configurable for other chemistries like LiFePo47 Stage for Lead acid. Configurable for other chemistries like LiFePo48 Stage for Lead acid. Configurable for other chemistries like LiFePo4
Mechanical
[12]Ambient temperature range-10°C to 60°C-10°C to 60°C-10°C to 60°C-10°C to 60°C-10°C to 60°C-10°C to 60°C
[13]PortsSolar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port2Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port3Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port3Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port4Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port5Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port6
[14]Display16 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV17 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV18 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV19 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV20 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV21 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV
[15]Dimension 200X120X95mm 200X120X95mm 135X270X115mm135X270X115mm135X270X115mm307X185X107mm
[16]Weight2 Kgs2 Kgs3 Kgs3 Kgs3 Kgs4 Kgs
Protections
[17]Battery Reverse polarity Electronically protectedElectronically protectedElectronically protectedElectronically protectedElectronically protectedElectronically protected
[18]PV Reverse and Short circuitElectronically protectedElectronically protectedElectronically protectedElectronically protectedElectronically protectedElectronically protected
[19]Over current protectionSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeout
[20]Over temperature protectionSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeout
Notes

1. Default vaues are set for Lead acid batteries with three stage battery charging.

2. Data port has RS485 communication . ( Modbus protocol) . Needs Amberlink adapter to connect to PC or WiFi network.

3. External temperature sensing requires purchase of external temperature sensor from Amberroot.

REhub ECO DC


Key Specifications

REhub MPPT 12/24V DC


Key Specifications

REhub 48 DC


Key Specifications
Battery System Voltage : 12/24V – Auto detectBattery System Voltage : 12/24V – Auto detectBattery System Voltage : 36V /48V – must be selected at first time start
Rated SOLAR Output Current : 25ARated SOLAR Output Current : 40ARated DC Load Current : 30A
Rated DC Load Current : 15ARated DC Load Current : 30ARated DC Load Current : 30A
Typical Array Size :
  1. 100 – 500Wp for 12V batt
300 – 1000Wp for 24V batt
Typical Array Size :
300 – 700Wp for 12V batt
  1. 300 – 1400Wp for 24V batt
Typical Array Size :
  1. 1500 – 2000Wp for 36V batt
  2. 1500 – 2700 Wp for 48V batt
Typical Array Configuration:
  1. Single 72 Cell for both 12/24V batt output
  2. Multiple panels can be connected in series up to 90Voc
Typical Array Configuration:
  1. Multiple panels can be connected in series up to 90Voc. Connect in series-parallel when Voc of array exceeds 90V
Typical Array Configuration:
  1. Three 72 cell panels in series and multiple such strings in series-parallel arrangement
DC Load controller functions :
  1. Loads are provided Battery Voltage
  2. Low Voltage Disconnect of Loads from Batteries

  3 Usage modes ( Dusk to Dawn control of Loads or Always on control of Loads)
  4. Short circuit protection
DC Load controller functions :
  1. Low Voltage Disconnect of Loads from Batteries
  2. Usage modes ( Dusk to Dawn control of Loads or Always on control of Loads)
  3. Short circuit protection
DC Load controller functions :
  1. Low Voltage Disconnect of Loads from Batteries
  2. Usage modes ( Dusk to Dawn control of Loads or Always on control of Loads)
  3. Short circuit protection

REhub ECO DC

Key Specifications

  • Battery System Voltage : 12/24V – Auto detect

  • Rated SOLAR Output Current : 25A

  • Rated DC Load Current : 15A

  • Array Voc: 90V

  • Typical Array Size :

    • 100 – 500Wp for 12V batt

    • 300 – 1000Wp for 24V batt

  • Typical Array Configuration:

    • Single 72 Cell for both 12/24V batt output

    • Multiple panels can be connected in series up to 90Voc

  • DC Load controller functions :

    • Loads are provided Battery Voltage

    • Low Voltage Disconnect of Loads from Batteries

    • Usage modes ( Dusk to Dawn control of Loads or Always on control of Loads)

    • Short circuit protection

  • Specifications

  • User Manual

REhub MPPT 12/24V DC

Key Specifications

  • Battery System Voltage : 12/24V – Auto detect

  • Rated SOLAR Output Current : 40A

  • Rated DC Load Current : 30A

  • Array Voc: 90V

  • Typical Array Size :

    • 300 – 700Wp for 12V batt

    • 300 – 1400Wp for 24V batt

  • Typical Array Configuration:

    • Multiple panels can be connected in series up to 90Voc. Connect in series-parallel when Voc of array exceeds 90V

  • DC Load controller functions :

    • Low Voltage Disconnect of Loads from Batteries

    • Usage modes ( Dusk to Dawn control of Loads or Always on control of Loads)

    • Short circuit protection

  • Specifications

  • User Manual

REhub 48 DC

Key Specifications

  • Battery System Voltage : 36V /48V – must be selected at first time start

  • Rated SOLAR Output Current : 40A

  • Rated DC Load Current : 30A

  • Array Voc: 150V

  • Typical Array Size :

    • 1500 – 2000Wp for 36V batt

    • 1500 – 2700 Wp for 48V batt

  • Typical Array Configuration:

    • Three 72 cell panels in series and multiple such strings in series-parallel arrangement

  • DC Load controller functions :

    • Low Voltage Disconnect of Loads from Batteries

    • Usage modes ( Dusk to Dawn control of Loads or Always on control of Loads)

    • Short circuit protection

  • Specifications

  • User Manual

Solar PV for DC Loads

Going completely Direct Current (DC) for loads makes it far more efficient compared to using Loads running on Alternating Current (AC) specially when the source of power is Solar. Most of our appliances such as LED lamps, TV ultimately run on DC. Further most of electronic devices and even home appliance motors can be DC.  With Solar Photo Voltaic as a source of Power – in a DC system the following Voltage conversions happen : 

Solar PV Panel at Maximum Power Point Voltage –> Battery Bus Voltage –> DC Load . Alternately and additional step of DC -DC conversion to Load Voltage if the Load Voltage is different from Battery Voltage or the Load requires a regulated Voltage output. 

Whereas with AC loads the following Voltage  conversions happen : 

Solar PV Panel at Maximum Power Point Voltage –> Battery Bus Voltage –> DC -AC inversion to 230VAC –> 230VAC to DC Load Voltage. 

There is a loss of 10% to 20% when DC power is converted to AC power. and a loss of 5% to 20% when AC power is converted to DC power.   Going all DC is thus quite advantageous, but practical issues around the availability of home appliances that work on DC, lack of standards around DC bus Voltage, home wiring etc. prevent adoption of DC for homes. 

Yet, many of Amberroot’s customers have adopted Solar DC for lighting and DC fans, and a few appliances in their homes, using Amberroot’s REhub MPPT DC to efficiently extract power from Solar panels and power the DC loads safety from the Batteries. 

Others have used REhub MPPT DC in innovative applications including DC light masts deployed in Airports, Road construction etc.  

REhub DCs are also being used in Industrial applications include powering Flowmeters in water supply boards, powering earthquake monitoring equipment etc. 

These applications require regulated DC output – with sensitive equipment requiring Voltages within a narrow band .  Do write to us for solutions for your DC load requirements !

Short Circuit Protection

Load controllers protect the batteries and system from Load Short circuit.

The Load controller detects the rising current under short circuit conditions and disconnects the Loads from the batteries. After a suitable timeout (Factory configurable) the connection is re-attempted – and if the short circuit conditions persist, the Loads are disconnected again. This rapid disconnection protects the circuits from high currents, and potential burning out of the wires etc. Because the Load disconnection is using Mosfets, the action is very fast and self-correcting once the short circuit conditions are resolved.

Keep Batteries Safe

Low Voltage Disconnect

The Load Controller protects the batteries from deep discharge

The Load controllers disconnect the Loads from the batteries at a pre-set (factory configurable) Voltage.

This protects the battery from deep discharge. The Load controllers automatically re-connect the Loads at a Pre-set reconnect Voltage.

Regulated Voltage output from the Load Controller

Some Loads require regulated Voltage input and cannot directly use the Battery Voltage range. Regulated output options are available with buck boost Load controllers that limit the Voltage to the Loads within a tight tolerance. ( E.g 12V +/- 5% from a 12V battery or 24V +/- 5% from a 24V battery) .

LOAD CONTROLLER USAGE MODES

DUSK to DAWN mode

In Dusk to Dawn mode REhub DC uses Solar Voltage (This Voltage is Field Selectable from REhub Menu) to Switch ON and Switch OFF the Loads. For example, if the Voltage selected is say 30V and the Voltage from the Solar panel drops below 30V (Indicating Dusk) , the Load is automatically switched on after a Time Out.

When the Voltage from the Solar Panels is greater than the Battery Voltage, the Load is switched off Automatically after a time out.

Application example:

Light Masts: Using Solar energy to charge the batteries through the day and using the stored Solar energy to power the Lamps in the night in lieu of Diesel generators

Always On Mode

In Always ON mode, the Power is available to the Loads unless there is a Load Short circuit or conditions for Low Voltage Disconnect.

Application: Running DC loads that are expected to run even in daytime with Solar energy – DC light, DC ai rconditioners , DC fans etc

Ordering the Solar MPPT chargers with DC Load controllers

  1. Select Solar charger based on Load requirements and battery requirements.

    • For example, if the Solar PV sizing is 600Wp and battery size is 12V, you will need REhub MPPT 40A 12/24V charger.

    • If the Battery Voltage is however 24V , and the Panel sizing is still 600Wp, then REhub MPPT ECO 25A 12/24V is sufficient.

  2. Select the Load controller based on Load current requirements

    • Let us say the Load current is 10A . In this case if the Solar charger requirement is REhub MPPT  40A 12/24V – then the option is only REhub MPPT 40A 12/24V paired with 30A Load controller.

  3. If the Loads need regulated Voltage – DC regulated Load controller is required.

    • Contact us for the selection of Regulated Load controller. Based on the Battery Voltage (Input to the Load controller) and the Output Voltage (which is the input to the Load ) , a Buck-boost regulator or a buck regulator or a boost regulator is required.

The Load controller are available paired with different REhub MPPT chargers. When done so the MPPT chargers can be used to run DC loads with Solar energy. The Mode of operation depends on the application and is a factory setting.

1. Dusk to Dawn Mode

In Dusk to Dawn mode REhub DC uses Solar Voltage (This Voltage is Field Selectable from REhub Menu) to Switch ON and Switch OFF the Loads. For example, if the Voltage selected is say 30V and the Voltage from the Solar panel drops below 30V (Indicating Dusk) , the Load is automatically switched on after a Time Out.

When the Voltage from the Solar Panels is greater than the Battery Voltage, the Load is switched off Automatically after a time out.

Application example:

Light Masts: Using Solar energy to charge the batteries through the day and using the stored Solar energy to power the Lamps in the night in lieu of Diesel generators.

2. Always On Mode

In Always ON mode, the Power is available to the Loads unless there is a Load Short circuit or conditions

for Low Voltage Disconnect.

Application:

Running DC loads that are expected to run even in daytime with Solar energy.

Specifications

Operating principleHigh efficiency MPPT Based Solar Charger with DC Load controller. High efficiency MPPT Based Solar Charger with DC Load controller. High efficiency MPPT Based Solar Charger with DC Load controller. Monitors the net battery current delivered to the batteries to ensure optimal charging rate and maximizes the usage of SolarHigh efficiency MPPT Based Solar Charger with DC Load controller. Monitors the net battery current delivered to the batteries to ensure optimal charging rate and maximizes the usage of SolarHigh efficiency MPPT Based Solar Charger with DC Load controller. Monitors the net battery current delivered to the batteries to ensure optimal charging rate and maximizes the usage of SolarHigh efficiency MPPT Based Solar Charger with DC Load controller. Monitors the net battery current delivered to the batteries to ensure optimal charging rate and maximizes the usage of Solar
Solar
REhub MPPT Eco 12/24V
REhub MPPT Eco 12/24V
REhub MPPT 12/24 - 40A
REhub MPPT 12/24 - 40A
REhub MPPT 36
REhub MPPT 48
[1]Battery Voltage detectionAuto detects 12/24VAuto detects 12/24VAuto detects 12/24VAuto detects 12/24V36V 48V
[2]Battery System Voltage 12Vnom24Vnom12Vnom24Vnom36Vnom48Vnom
[3]Recommended Solar module STC Wp500W1000W700W1400W1400W2500W
[4]Output Current – Continuous , Max25A25A40A40A30A40A
[5]PV Open Circuit Voltage (VOC)90V90V90V90V90V150V
[6]PV MPPT Voltage range> Battery Voltage to VoC limit of charger> Battery Voltage to VoC limit of charger> Battery Voltage to VoC limit of charger> Battery Voltage to VoC limit of charger> Battery Voltage to VoC limit of charger> Battery Voltage to VoC limit of charger
[7]Power Conversion Efficiency (typical)91% typ95% typ91% typ95% typ95% typ95% typ
[8]Full load output voltageSame as battery voltageSame as battery voltageSame as battery voltageSame as battery voltageSame as battery voltage
[9]Float Mode Charge Voltage (Configurable)113.5V27V13.5V27V40.5V54V
[10]Bulk Mode Charge Voltage14.4V28.8V14.4V28.8V43.2V57.6V
[11]Battery Charging states3 Stage for Lead acid. Configurable for other chemistries like LiFePo44 Stage for Lead acid. Configurable for other chemistries like LiFePo45 Stage for Lead acid. Configurable for other chemistries like LiFePo46 Stage for Lead acid. Configurable for other chemistries like LiFePo47 Stage for Lead acid. Configurable for other chemistries like LiFePo48 Stage for Lead acid. Configurable for other chemistries like LiFePo4
Mechanical
[12]Ambient temperature range-10°C to 60°C-10°C to 60°C-10°C to 60°C-10°C to 60°C-10°C to 60°C-10°C to 60°C
[13]PortsSolar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port2Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port3Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port3Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port4Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port5Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port6
[14]Display16 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV17 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV18 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV19 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV20 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV21 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV
[15]Dimension 200X120X95mm 200X120X95mm 135X270X115mm135X270X115mm135X270X115mm307X185X107mm
[16]Weight2 Kgs2 Kgs3 Kgs3 Kgs3 Kgs4 Kgs
Protections
[17]Battery Reverse polarity Electronically protectedElectronically protectedElectronically protectedElectronically protectedElectronically protectedElectronically protected
[18]PV Reverse and Short circuitElectronically protectedElectronically protectedElectronically protectedElectronically protectedElectronically protectedElectronically protected
[19]Over current protectionSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeout
[20]Over temperature protectionSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeoutSystem shutdown, recovers with a timeout
Notes

1. Default vaues are set for Lead acid batteries with three stage battery charging.

2. Data port has RS485 communication . ( Modbus protocol) . Needs Amberlink adapter to connect to PC or WiFi network.

3. External temperature sensing requires purchase of external temperature sensor from Amberroot.

Load Controller

S/No
Parameters
Load Controller
15A
Load Controller
30A
1SwitchingMOSFET Based [Solid State Switching]MOSFET Based [Solid State Switching]
2Rated Load Current15A30A
3Permissible Maximum Load110% of rated Load Current for small duration110% of rated Load Current for small duration
4Minimum Load CurrentZeroZero
5VoltageSame as Battery VoltageSame as Battery Voltage
6IndicationLoad Current and Voltage. Shown in the LCD display of the paired Solar ChargerLoad Current and Voltage. Shown in the LCD display of the paired Solar Charger
7Control function Controlled from the Paired Solar chargerControlled from the Paired Solar charger
8Operation ModesLoad Always ON Mode.


Dusk to Dawn Mode.
Load Always ON Mode.


Dusk to Dawn Mode.
9Low Voltage DisconnectDisconnects Load from Batteries at pre-set Voltage of battery: Voltage value is factory configurable. Default Value is 11.5V. (For 12Vnom. Multiply by 2 for 24V, 3 for 36V and 4 for 48V)Disconnects Load from Batteries at pre-set Voltage of battery: Voltage value is factory configurable. Default Value is 11.5V. (For 12Vnom. Multiply by 2 for 24V, 3 for 36V and 4 for 48V)
10Load ReconnectLoad Reconnect Voltage is factory configurable. Default value is 12V. (For 12Vnom. Multiply by 2 for 24V, 3 for 36V and 4 for 48V)Load Reconnect Voltage is factory configurable. Default value is 12V. (For 12Vnom. Multiply by 2 for 24V, 3 for 36V and 4 for 48V)
11Short Circuit ProtectionDisconnects Load from Batteries and does reattempt after a time outDisconnects Load from Batteries and does reattempt after a time out
12CoolingFan cooled with FAN from Solar chargerFan cooled with FAN from Solar charger
13PortsLoad +Ve, Load -VeLoad +Ve, Load -Ve

Regulated Load Voltage Output

Buck-Boost Regulator
Buck-Boost Regulator
12V
24V
[1]Battery Voltage range12Vnom. 10V to 15V24Vnom. 20V to 30V
[2]Nominal voltage12V +/- 5% 50ppm/deg C24V +/- 3% 50ppm/deg C
[3]Continuous current15A15A
[4]Peak Current20A, 10 Seconds20A, 10 Seconds
[5]Ripple voltage200mVp-p max with steady load200mVp-p max with steady load
[6]Short circuit protectionProtectedProtected
[7]Efficiency> 87%> 87%
[8]Low voltage cutoff11V (Configurable)21V (Configurable)
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