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.
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| Operating principle | High 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 Solar | 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 Solar | 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 Solar | 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 Solar | |
| [1] | Battery Voltage detection | Auto detects 12/24V | Auto detects 12/24V | Auto detects 12/24V | Auto detects 12/24V | 36V | 48V |
| [2] | Battery System Voltage | 12Vnom | 24Vnom | 12Vnom | 24Vnom | 36Vnom | 48Vnom |
| [3] | Recommended Solar module STC Wp | 500W | 1000W | 700W | 1400W | 1400W | 2500W |
| [4] | Output Current – Continuous , Max | 25A | 25A | 40A | 40A | 30A | 40A |
| [5] | PV Open Circuit Voltage (VOC) | 90V | 90V | 90V | 90V | 90V | 150V |
| [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% typ | 95% typ | 91% typ | 95% typ | 95% typ | 95% typ |
| [8] | Full load output voltage | Same as battery voltage | Same as battery voltage | Same as battery voltage | Same as battery voltage | Same as battery voltage | |
| [9] | Float Mode Charge Voltage (Configurable)1 | 13.5V | 27V | 13.5V | 27V | 40.5V | 54V |
| [10] | Bulk Mode Charge Voltage | 14.4V | 28.8V | 14.4V | 28.8V | 43.2V | 57.6V |
| [11] | Battery Charging states | 3 Stage for Lead acid. Configurable for other chemistries like LiFePo4 | 4 Stage for Lead acid. Configurable for other chemistries like LiFePo4 | 5 Stage for Lead acid. Configurable for other chemistries like LiFePo4 | 6 Stage for Lead acid. Configurable for other chemistries like LiFePo4 | 7 Stage for Lead acid. Configurable for other chemistries like LiFePo4 | 8 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] | Ports | Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port2 | Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port3 | Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port3 | Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port4 | Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port5 | Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port6 |
| [14] | Display | 16 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV | 17 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV | 18 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV | 19 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV | 20 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV | 21 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV |
| [15] | Dimension | 200X120X95mm | 200X120X95mm | 135X270X115mm | 135X270X115mm | 135X270X115mm | 307X185X107mm |
| [16] | Weight | 2 Kgs | 2 Kgs | 3 Kgs | 3 Kgs | 3 Kgs | 4 Kgs |
| Protections | |||||||
| [17] | Battery Reverse polarity | Electronically protected | Electronically protected | Electronically protected | Electronically protected | Electronically protected | Electronically protected |
| [18] | PV Reverse and Short circuit | Electronically protected | Electronically protected | Electronically protected | Electronically protected | Electronically protected | Electronically protected |
| [19] | Over current protection | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout |
| [20] | Over temperature protection | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout | System 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. |
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REhub ECO DCKey Specifications | REhub MPPT 12/24V DCKey Specifications | REhub 48 DCKey Specifications |
| Battery System Voltage : 12/24V – Auto detect | Battery System Voltage : 12/24V – Auto detect | Battery System Voltage : 36V /48V – must be selected at first time start |
| Rated SOLAR Output Current : 25A | Rated SOLAR Output Current : 40A | Rated DC Load Current : 30A |
| Rated DC Load Current : 15A | Rated DC Load Current : 30A | Rated 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 |
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
User Manual
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
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
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 !
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.
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.
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) .
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
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
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.
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.
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.
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.
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.
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| Operating principle | High 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 Solar | 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 Solar | 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 Solar | 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 Solar | |
| [1] | Battery Voltage detection | Auto detects 12/24V | Auto detects 12/24V | Auto detects 12/24V | Auto detects 12/24V | 36V | 48V |
| [2] | Battery System Voltage | 12Vnom | 24Vnom | 12Vnom | 24Vnom | 36Vnom | 48Vnom |
| [3] | Recommended Solar module STC Wp | 500W | 1000W | 700W | 1400W | 1400W | 2500W |
| [4] | Output Current – Continuous , Max | 25A | 25A | 40A | 40A | 30A | 40A |
| [5] | PV Open Circuit Voltage (VOC) | 90V | 90V | 90V | 90V | 90V | 150V |
| [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% typ | 95% typ | 91% typ | 95% typ | 95% typ | 95% typ |
| [8] | Full load output voltage | Same as battery voltage | Same as battery voltage | Same as battery voltage | Same as battery voltage | Same as battery voltage | |
| [9] | Float Mode Charge Voltage (Configurable)1 | 13.5V | 27V | 13.5V | 27V | 40.5V | 54V |
| [10] | Bulk Mode Charge Voltage | 14.4V | 28.8V | 14.4V | 28.8V | 43.2V | 57.6V |
| [11] | Battery Charging states | 3 Stage for Lead acid. Configurable for other chemistries like LiFePo4 | 4 Stage for Lead acid. Configurable for other chemistries like LiFePo4 | 5 Stage for Lead acid. Configurable for other chemistries like LiFePo4 | 6 Stage for Lead acid. Configurable for other chemistries like LiFePo4 | 7 Stage for Lead acid. Configurable for other chemistries like LiFePo4 | 8 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] | Ports | Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port2 | Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port3 | Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port3 | Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port4 | Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port5 | Solar +Ve, Solar -Ve. Battery +Ve, Battery -Ve, Load +Ve, Load -Ve, Data Port6 |
| [14] | Display | 16 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV | 17 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV | 18 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV | 19 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV | 20 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV | 21 X2 Backlit character LCD to display system state, Instantaneous Power and cumulative energy generated from Solar PV |
| [15] | Dimension | 200X120X95mm | 200X120X95mm | 135X270X115mm | 135X270X115mm | 135X270X115mm | 307X185X107mm |
| [16] | Weight | 2 Kgs | 2 Kgs | 3 Kgs | 3 Kgs | 3 Kgs | 4 Kgs |
| Protections | |||||||
| [17] | Battery Reverse polarity | Electronically protected | Electronically protected | Electronically protected | Electronically protected | Electronically protected | Electronically protected |
| [18] | PV Reverse and Short circuit | Electronically protected | Electronically protected | Electronically protected | Electronically protected | Electronically protected | Electronically protected |
| [19] | Over current protection | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout |
| [20] | Over temperature protection | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout | System shutdown, recovers with a timeout | System 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. |
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15A | 30A |
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| 1 | Switching | MOSFET Based [Solid State Switching] | MOSFET Based [Solid State Switching] |
| 2 | Rated Load Current | 15A | 30A |
| 3 | Permissible Maximum Load | 110% of rated Load Current for small duration | 110% of rated Load Current for small duration |
| 4 | Minimum Load Current | Zero | Zero |
| 5 | Voltage | Same as Battery Voltage | Same as Battery Voltage |
| 6 | Indication | Load Current and Voltage. Shown in the LCD display of the paired Solar Charger | Load Current and Voltage. Shown in the LCD display of the paired Solar Charger |
| 7 | Control function | Controlled from the Paired Solar charger | Controlled from the Paired Solar charger |
| 8 | Operation Modes | Load Always ON Mode. Dusk to Dawn Mode. | Load Always ON Mode. Dusk to Dawn Mode. |
| 9 | Low Voltage Disconnect | 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) | 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) |
| 10 | Load Reconnect | Load 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) |
| 11 | Short Circuit Protection | Disconnects Load from Batteries and does reattempt after a time out | Disconnects Load from Batteries and does reattempt after a time out |
| 12 | Cooling | Fan cooled with FAN from Solar charger | Fan cooled with FAN from Solar charger |
| 13 | Ports | Load +Ve, Load -Ve | Load +Ve, Load -Ve |
| [1] | Battery Voltage range | 12Vnom. 10V to 15V | 24Vnom. 20V to 30V |
| [2] | Nominal voltage | 12V +/- 5% 50ppm/deg C | 24V +/- 3% 50ppm/deg C |
| [3] | Continuous current | 15A | 15A |
| [4] | Peak Current | 20A, 10 Seconds | 20A, 10 Seconds |
| [5] | Ripple voltage | 200mVp-p max with steady load | 200mVp-p max with steady load |
| [6] | Short circuit protection | Protected | Protected |
| [7] | Efficiency | > 87% | > 87% |
| [8] | Low voltage cutoff | 11V (Configurable) | 21V (Configurable) |