Summary

• Page properties (2 modified, 0 added, 0 removed)

Details

Page properties

Author

...	...	@@ -1,1 +1,1 @@
1		-XWiki.Xiaoling
	1	+XWiki.Edwin

Content

...	...	@@ -82,7 +82,6 @@
82	82
83	83	* [[Battery Dimension>>https://www.dropbox.com/sh/o3k9x20fv2osi3w/AAAGf2B7HcRGog8xAOPoMWPha?dl=0]]
84	84
85		-
86	86	== 2.3 When and how to Replace Battery ==
87	87
88	88
...	...	@@ -125,7 +125,6 @@
125	125	* UV resistance
126	126
127	127
128		-
129	129	== 3.4 Related Document ==
130	130
131	131
...	...	@@ -132,7 +132,6 @@
132	132	* **[[Recharge Circuit. >>https://www.dropbox.com/scl/fo/p9iqzcmivaczpmhwufj6s/h?rlkey=9zq6irrzj46ajy933ghg5uw3m&dl=0]]**
133	133
134	134
135		-
136	136	== 3.5 Recharge without Solar ==
137	137
138	138
...	...	@@ -150,6 +150,7 @@
150	150
151	151	= 4. Power Consumption Analyze =
152	152
	150	+== 4.1 Method 1: Use Our Calculate Table ==
153	153
154	154	Dragino Battery powered product are all runs in Low Power mode. We have an update battery calculator which base on the measurement of the real device. User can use this calculator to check the battery life and calculate the battery life if want to use different transmit interval.
155	155
...	...	@@ -168,6 +168,38 @@
168	168	[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/D20-LBD22-LBD23-LB_LoRaWAN_Temperature_Sensor_User_Manual/WebHome/1675146895108-304.png?rev=1.1||alt="1675146895108-304.png"]]
169	169
170	170
	169	+== 4.2 Method 2: Manual Calcuation. ==
	170	+
	171	+=== 4.2.1 For -LB / -LS LoRaWAN models base on ASR6601 ===
	172	+
	173	+The power consumption mainly include three parts:
	174	+
	175	+* Sleep Power  : Most time the CPU are in sleep mode. It is around 6uA, So **for one day**, total power consumption: 6uA x 24(hour) = 144 uAh = 0.144mAh (base on batter output voltage)
	176	+* Watch Dog Current: Internal Water Dog to monitor Software state: this is very small and same for each device.** for one day**: 0.003mAH
	177	+* Sampling Power: The power consume to read sensor for each sampling.
	178	+** Example, SN50v3-LB connect to an external sensor, each reading need to use 5V , and sensor require current 10mA and 2 seconds. So each sampling need 10mA x 2 seconds / 3600 = 0.0056mAh ( base on 5v). Assume 90% converter rate from 3.3v to 5v) , we can consider the mAh in 3.3v is 0.0056mAh/90% = **0.0062mAh per sampling**. If one day, SN50v3-LB read this sensor 3 times every hour. So **for one day**, the total power consumption is 0.0062mAh x 3 x 24 = 0.4464 mAh
	179	+* Transmit & Receive Power: this power consumption depends on the transmit power and the data rate (DR) settings. They are the same for all -LB and -LS series. Below are the reference
	180	+** EU868 band, TXP=0 (Max Power), DR=5 （Shortest Distance） : ~~0.0028mAh (base on 3.3v) (per transmit + receive).
	181	+** EU868 band, TXP=0 (Max Power), DR=0 （Longest Distance） :  ~~0.044 mAh (base on 3.3v) (per transmit + receive).
	182	+
	183	+
	184	+So for SN50v3 with above sensor, we set 5V output to open 2 seconds every reading and set TDC = 20 minutes. So 72 reading and transmit every day
	185	+
	186	+The total power consumption is
	187	+
	188	+* EU868 , Good Signal : 0.144mAh + 0.003mAh + 0.0062mAh * 72 + 0.0028 mAh * 72 = 0.795 mAh per day. For the 8500mAh , if we consider 20% margin, we can use 8500mAh x 80% / 0.795mAh = 8553 days
	189	+* EU868 , Poor Signal: 0.144mAh + 0.003mAh + 0.0062mAh * 72 + 0.044 mAh * 72 = 3.7614 mAh per day, For the 8500mAh, if we consider 20% margin, we can use 8500mAh x 80% / 3.7614 mAh = 1807 days
	190	+
	191	+(((
	192	+
	193	+)))
	194	+
	195	+(% class="box warningmessage" %)
	196	+(((
	197	+Notice, actually deployment situation is more complicate and above calcualtion is base on lab. The calculation is only for reference. It doesn't response for the promising battery life.
	198	+)))
	199	+
	200	+
171	171	= 5. Debug for Battery running out shortly =
172	172
173	173