Just found this $5 device https://www.aliexpress.us/item/3256806764600243.html?gatewayAdapt=glo2usa which may do what I need (shut off a battery charger when it reaches a pre-set voltage). If it works, will make charging your battery to 90% (or any %) possible using any charger. Just need to put the board into an enclosure and do some wiring.
Below is the item description (I have not read it fully yet, one that I did read: it detects voltages of DC 0-100V). There are 3 choices available DC5V, DC12V and DC24V. I assume those are the voltages the device runs on? If so, DC5V will be most convenient since I can run it on commonly available USB 5V chargers.
DVB01 Digital Display Window Voltage Comparator DC 5V 12V 24V Voltage Measurement Charge Discharge Monitor Electronic Components
Features:
1.High Precision: The DVB01 digital voltage comparator module delivers highly precise results during voltage comparison. It quickly and accurately compares the input voltage with the reference voltage, providing corresponding logic signals as output.
2.Wide Input Voltage Range: The DVB01 charge discharge protection module typically features a wide input voltage range, accommodating various working conditions and circuit requirements. It accepts input signals of different voltage levels, ensuring reliable comparison operations from low to high voltages.
3.Fast Response Time: The DVB01 voltmeter microcontroller board swiftly compares input voltages and generates output results in a very short period. It boasts fast response times to meet the demands of real-time applications such as high-frequency signal processing or sensor feedback control.
4.Low Power Consumption: Designed for energy efficiency and prolonged operation, the DVB01 charge discharge monitor controller is engineered with low power consumption in mind. It utilizes optimized circuit designs and low-power components to maintain lower power levels, extending battery life or reducing energy consumption.
5.Multiple Output Configuration Options: The DVB01 digital display window voltage comparator offers various output configuration options to cater to different application requirements. It can provide digital signals (such as high or low levels) or analog signals (such as voltage or current), often featuring flexible output settings and control modes.
Specification:
Origin: Mainland China
Type: Module
Condition: New
Product Size: 68.00x44.00x17.00mm/2.68x1.73x0.67inch
1. DVB01 module is a multi-functional voltage monitoring controller, adopting industrial grade microcontroller as the main control unit, with wide measuring range and high precision.
2. The controller is preset with 5 different functions and can be customized and added with other specific functions according to user's needs.
3. The module is carefully processed and made of genuine high-quality components, with stable performance, and can be widely used in a variety of voltage measurement and control class occasions.
Functional Features:
1. Provide 5 kinds of functions for users to choose, to meet more application requirements;
2. User can set the upper voltage limit and lower voltage limit;
3. Measuring range DC 0-100V, measuring accuracy +/-0.1V;
4. Add automatic power saving function, users can set it independently;
5. All setup parameters can be saved automatically, and the setup content will not be lost after power-down.
6. Newly add 0-99.9 seconds delayed suction and 0-99.9 seconds delayed disconnection function.
Module Function:
Function 1:
Voltage measurement: select this function, the relay will not act, the digital tube displays the current measured voltage;
Function 2:
Charge monitoring: when the measured voltage is lower than the lower limit voltage, the relay will be absorbed, higher than the upper limit voltage, the relay will be disconnected;
Function 3:
Discharge monitoring: when the measured voltage is higher than the upper limit voltage, the relay will be absorbed, lower than the lower limit voltage, the relay will be disconnected;
Function 4:
Suction in the interval: when the measured voltage is between the upper limit and the lower limit, the relay is absorbed, otherwise the relay is disconnected;
Function 5:
Outside the interval: when the measured voltage is lower than the lower limit voltage, or the measured voltage is higher than the upper limit voltage, the relay will be engaged; in other cases, the relay will be disconnected.
Electrical Parameters:
1. Working voltage: DC 5V, 12V, 24V three optional (should not exceed the nominal voltage of +/-10%)
2. Operating current: less than 90mA at 5V (less than 12mA when the relay is not in action, less than 3mA when the display is closed)
Less than 50mA at 12V (less than 12mA when the relay is not activated, less than 3mA when the display is closed)
Less than 35mA at 24V (less than 12mA when the relay is not activated, less than 3mA when the display is turned off)
3. Operating temperature: recommended -20℃-60℃ (limit range -30℃-70℃)
4.Measuring range: 0-99.9V
5. Load capacity: Maximum load capacity of relay normally open port: DC 0-30V/10A, AC 0-250V/10A
Relay normally closed port maximum load capacity: DC 0-28V/10A, AC 0-125V/10A
Module Interface:
Module voltage input: there are 4-wire interfaces, all interfaces have terminals for user convenience
1. DC+: Positive pole of DC power supply
2. DC-: Negative pole of DC power supply
3. V+: measurement voltage positive pole
4. V-: negative pole of measuring voltage
Relay load output: 3-wire interface, all interfaces have terminals
1. NO: Normally open relay interface, the relay is suspended before the absorption, after the absorption and COM short connection
2. COM: relay common interface
3. NC: Normally closed relay interface, shorted to COM before the relay is absorbed, shorted to COM after the relay is absorbed.
Note:
The controller will automatically determine which of the preset voltages V1 and V2 is the upper limit voltage and which is the lower limit voltage according to different functions, so users do not need to be entangled in the question of who is bigger and who is smaller, and who is first and who is last when setting up.
Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!
Please allow 1-2cm measuring deviation due to manual measurement.
Below is the item description (I have not read it fully yet, one that I did read: it detects voltages of DC 0-100V). There are 3 choices available DC5V, DC12V and DC24V. I assume those are the voltages the device runs on? If so, DC5V will be most convenient since I can run it on commonly available USB 5V chargers.
DVB01 Digital Display Window Voltage Comparator DC 5V 12V 24V Voltage Measurement Charge Discharge Monitor Electronic Components
Features:
1.High Precision: The DVB01 digital voltage comparator module delivers highly precise results during voltage comparison. It quickly and accurately compares the input voltage with the reference voltage, providing corresponding logic signals as output.
2.Wide Input Voltage Range: The DVB01 charge discharge protection module typically features a wide input voltage range, accommodating various working conditions and circuit requirements. It accepts input signals of different voltage levels, ensuring reliable comparison operations from low to high voltages.
3.Fast Response Time: The DVB01 voltmeter microcontroller board swiftly compares input voltages and generates output results in a very short period. It boasts fast response times to meet the demands of real-time applications such as high-frequency signal processing or sensor feedback control.
4.Low Power Consumption: Designed for energy efficiency and prolonged operation, the DVB01 charge discharge monitor controller is engineered with low power consumption in mind. It utilizes optimized circuit designs and low-power components to maintain lower power levels, extending battery life or reducing energy consumption.
5.Multiple Output Configuration Options: The DVB01 digital display window voltage comparator offers various output configuration options to cater to different application requirements. It can provide digital signals (such as high or low levels) or analog signals (such as voltage or current), often featuring flexible output settings and control modes.
Specification:
Origin: Mainland China
Type: Module
Condition: New
Product Size: 68.00x44.00x17.00mm/2.68x1.73x0.67inch
1. DVB01 module is a multi-functional voltage monitoring controller, adopting industrial grade microcontroller as the main control unit, with wide measuring range and high precision.
2. The controller is preset with 5 different functions and can be customized and added with other specific functions according to user's needs.
3. The module is carefully processed and made of genuine high-quality components, with stable performance, and can be widely used in a variety of voltage measurement and control class occasions.
Functional Features:
1. Provide 5 kinds of functions for users to choose, to meet more application requirements;
2. User can set the upper voltage limit and lower voltage limit;
3. Measuring range DC 0-100V, measuring accuracy +/-0.1V;
4. Add automatic power saving function, users can set it independently;
5. All setup parameters can be saved automatically, and the setup content will not be lost after power-down.
6. Newly add 0-99.9 seconds delayed suction and 0-99.9 seconds delayed disconnection function.
Module Function:
Function 1:
Voltage measurement: select this function, the relay will not act, the digital tube displays the current measured voltage;
Function 2:
Charge monitoring: when the measured voltage is lower than the lower limit voltage, the relay will be absorbed, higher than the upper limit voltage, the relay will be disconnected;
Function 3:
Discharge monitoring: when the measured voltage is higher than the upper limit voltage, the relay will be absorbed, lower than the lower limit voltage, the relay will be disconnected;
Function 4:
Suction in the interval: when the measured voltage is between the upper limit and the lower limit, the relay is absorbed, otherwise the relay is disconnected;
Function 5:
Outside the interval: when the measured voltage is lower than the lower limit voltage, or the measured voltage is higher than the upper limit voltage, the relay will be engaged; in other cases, the relay will be disconnected.
Electrical Parameters:
1. Working voltage: DC 5V, 12V, 24V three optional (should not exceed the nominal voltage of +/-10%)
2. Operating current: less than 90mA at 5V (less than 12mA when the relay is not in action, less than 3mA when the display is closed)
Less than 50mA at 12V (less than 12mA when the relay is not activated, less than 3mA when the display is closed)
Less than 35mA at 24V (less than 12mA when the relay is not activated, less than 3mA when the display is turned off)
3. Operating temperature: recommended -20℃-60℃ (limit range -30℃-70℃)
4.Measuring range: 0-99.9V
5. Load capacity: Maximum load capacity of relay normally open port: DC 0-30V/10A, AC 0-250V/10A
Relay normally closed port maximum load capacity: DC 0-28V/10A, AC 0-125V/10A
Module Interface:
Module voltage input: there are 4-wire interfaces, all interfaces have terminals for user convenience
1. DC+: Positive pole of DC power supply
2. DC-: Negative pole of DC power supply
3. V+: measurement voltage positive pole
4. V-: negative pole of measuring voltage
Relay load output: 3-wire interface, all interfaces have terminals
1. NO: Normally open relay interface, the relay is suspended before the absorption, after the absorption and COM short connection
2. COM: relay common interface
3. NC: Normally closed relay interface, shorted to COM before the relay is absorbed, shorted to COM after the relay is absorbed.
Note:
The controller will automatically determine which of the preset voltages V1 and V2 is the upper limit voltage and which is the lower limit voltage according to different functions, so users do not need to be entangled in the question of who is bigger and who is smaller, and who is first and who is last when setting up.
Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!
Please allow 1-2cm measuring deviation due to manual measurement.
