4V HPC1550-1S4P Solar power solution for Bridge Monitoring System

2021-09-24 23:21:30 0

Solar Power Supply Solution for Bridge Monitoring System

 image.png

Electricity Mode of Monitoring Equipment 

Indoor

Power mode

current

Pulse current time

Pulse frequency

Consumed capacity per day mAh

60 days consumed capacity

static

0.5mA



62

3720

working

500mA

15S

1 time/hour

 

Outdoor

Power mode

current

Pulse current time

Pulse frequency

Consumed capacity per day mAh

7 days consumed capacity

static

0.5mA



45.34

317.38

working

500mA

10S

1 time/hour

 

Electricity requirement:

Voltage: 5V 

Peak current: 2A 

Temperature: -10℃~60℃

The indoor power supply must guarantee the capacity consumption for more than 60 days, and the outdoor power supply must guarantee the capacity consumption for more than 7 days without charging.

Analyze:

       1、Voltage 5V:  HPC single cell voltage 4.1V、minimum voltage 2.5V;

       2、Peak current 2A:HPC can fully meet the requirements (see the figure below)

       3、Temperature: HPC can complete basic work at -40℃~+85℃, and can fully meet the temperature requirement of -10℃~60℃.

 

Scheme design (indoor):

The indoor power mode selects HPC1550-10P (4V 4500mAh) to meet the demand side.

According to the indoor power consumption mode, it can be calculated that the daily consumption capacity is 62mAh, and the capacity of HPC1550-10P is 4500mAh, which can fully meet the basic work of 60 days.

 

IoT Battery |HPC| Lithium Thionyl Chloride Battery| Lithium Battery

According to the above data, it can be confirmed that the lowest voltage of HPC1550 is 450mAh, and the capacity of 10 pcs HPC1550 in parallel is 4500mAh, which can fully meet the indoor electricity demand

 

Charging: The maximum charging current is 2A, the recommended charging current is 1A, the charging cut-off current is 100mA, and the charging cut-off voltage is 4.1V.

 

Scheme design (outdoor):

According to the outdoor power consumption mode, the daily consumption capacity is calculated to be 45.34mAh. Considering the maintenance-free outdoor power supply, we use solar + battery pack for power supply.

 

The battery pack is responsible for powering the equipment, and the solar energy is responsible for charging the battery pack.

 

The battery pack uses 4 pcs HPC1550 in parallel with a capacity of 1800mAh, and the device can be used normally for at least 39 days in the absence of sunlight.

 

Test Data: Installation test under the condition of weak sunlight in Northwest China (4G communication peak 2A per minute, average 350mA 1 time/hour) 

 IoT Battery |HPC| Lithium Thionyl Chloride Battery| Lithium Battery

The voltage change under the condition that the solar + battery pack discharges an average capacity of 180mAh per day. 

 IoT Battery |HPC| Lithium Thionyl Chloride Battery| Lithium Battery

According to the above data, the charging rate of solar energy is greater than the power consumption rate of the device, and the solar + HPC battery pack can fully meet the basic communication power consumption requirements (350mA discharge 60S, 1 time/hour)

 

Therefore, the solar+HPC battery pack can also meet the outdoor power consumption mode (500mA discharge 10S, 1 time/hour).