Power modules for Pixhawk/PX4/ArduPilot/APM
- Sensor calibration values included and tested.
- Current and voltage measurements use the full analog input range of the flight controller.
- Accuracy of +/- 0.5% over the entire sensor range.
Safe and Reliable Power Supply
- Reverse polarity protection.
- Extremely low output ripple voltage.
- Input and output protected by high quality capacitors.
- Redundant output wires.
Monitor up to 8 batteries
Multiple sensor configurations available:
- Single battery setup
- Dual battery setup
- 3 to 8 battery setup
Quality manufacturing and testing
- High quality Hall sensors and capacitors.
- All sensors are bench tested on an actual flight controller using Mission Planner.
3 Amp Output
Enough to power most equipment.
2 Voltage Classes
BECs and current sensors for 2-6S and 4-14S LiPos.
Original design, a popular choice.
10 Amp Outputs
For vehicles with power hungry equipment.
To accomodate most batteries.
Uses PL Sensors
Fewer parts, easier to setup.
Monitor power systems up to 1600A
- No hub
- 1x 50A sensor
- 1x 100A sensor
- 1x 200A sensor
- Sensor Hub X2
- 2x 50A sensor
- 2x 100A sensor
- 2x 200A sensor
- Sensor Hub X8
- 8x 50A sensor
- 8x 100A sensor
- 8x 200A sensor
Monitor two or more batteries by using sensor hubs
Battery 1 current
Battery 2 current
Difference of more than 15% between battery currents triggers alarm!
Calibration Values Provided and Ready to Input into Mission Planner
Having accurate calibration values configured in ArduPilot is of paramount importance for the proper computation of battery consumption, as well as the reliability of alerts and failsafes which are critical safety features. Each PL sensor is individually tested with a flight controller and the calibration values of the specific PL sensor are determined. The highly accurate calibration values of each PL sensor is provided in a format that can be directly entered into ArduPilot. Not everybody is willing to go through the steps of properly calibrating their power module. The PL sensors remove the need for users to painstakingly perform the calibration steps.
1. In Mission Planner, under INITIAL SETUP >> Optional Hardware >> Battery Monitor, set the “Sensor” to “Other”.
2. Enter the “Voltage divider” value provided with your PL sensor, then click out of the field to save the value. The calculated “Battery voltage” value should be within a few millivolts of the actual battery voltage.
3. Enter the “Amperes per volt” value provided with your PL sensor, then click out of the field to save the value.
Advantages compared to other power modules
- The current measurements use the full range of analog input voltage of the flight controller from 0.0V (corresponding to 0A) until 3.3V (corresponding to 50A, 100A, or 200A, respectively), so there is no need to adjust the parameter “BATT_AMP_OFFSET.”
- The original 3DR power module and most Atto boards experience voltage drops during hover (0.5-1.5V) caused by the resistance of the connectors and wires. In the PL sensor boards, the voltage drop error is minimized as only the resistance of the positive battery wire is measured. Additionally, the power supply for the BEC is separated and can be connected as close as possible to the battery. This results in more stable voltage/current measurements, accurate to +/- 0.5%.
- Furthermore, the voltage sensor has a filter which reduces the risk of false RTL trigger, which might otherwise happen in very windy conditions due to sudden motor speed up.
- The maximum output voltage of the sensor board is limited to 3.3V, so there’s no risk of damaging the analog inputs on the flight controller.
Each PL sensor is thoroughly bench tested using MAUCH’s rigorous process. The final QC is a setup with a flight controller (Pixhawk 2.1) and connected to Mission Planner to check the current and voltage calibration values.
Do you know any other manufacturer who uses an actual flight controller to test the calibration values of a power module?
- Why use a Hall sensor ?
- Why do only a few supplier use true Hall sensors for current measurement for unmanned vehicles?
- Why are the sensor board and BEC are separated ?
- Better Accuracy: The measurement over a normal shunt resistor is not accurate at lower currents (<3.0A). For a Hall sensor the measurement starts at 0.5A with an accuracy of +/-0.5A over the whole range up to 200A! This means better battery consumption calculations and ultimately more flight time.
- More Efficient: A shunt resistor creates heat due to the voltage drop, the Hall sensor has only an internal resistance of 100uOhm, so there is no power loss.
- Linear Measurements: Due to the heat created by a shunt resistor and the power cable, the measurement of the current is not linear and depends on the temperature. This doesn’t happen to a Hall sensor. A temperature change (created by the main LiPo cable) will not influence the measurement.
- Higher Currents: The current flows only through the Hall sensor and NOT through the PCB. Most other current measurement boards have the main cable soldered to the PCB and then it goes to the shunt resistor -> these boards can’t handle over 60A constant current !