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--- power_usage [2020/02/02 18:41] – nikolal
+++ power_usage [2022/09/19 11:34] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 ====== Power budget/usage ======
-^ Unit ^ Voltage      ^ Current       ^ Watts          ^
+The Otter is battery powered, constraining the duration of missions it can perform. A power budget is given
-| CPU | 12    | 1.4     | 16.8        |
+in the table below, showing the worst-case power usage for each component. The
-| GPS | 12    | 0.165 | 1.98 |
+total capacity of the four batteries is 3660Wh, resulting in a worst-case duration of battery operation of
-| WiFi | 24    | 0.3     | 7        |
+Wh/833.762W= 4.39h. As can be seen in the table, the motors dominate power consumption, and
-| SignalLED | 12    | 0.08 | 0.96|
+actuation should therefore be limited for long duration missions.
-| Hydrophone | 5    | 0.0044 | 0.022 |
-| Motors Full | 24-32    | Varies | 2x400     |
+^ Description ^ Hardware ^ Voltage      ^ Current       ^ Watts          ^
-^ Total ^       ^        ^ Watts          ^
+| CPU | RPI4 4GB + StratoPi CAN | 12    | 1.4     | 16.8        |
+| GPS | Hemisphere v104s| 12    | 0.165 | 1.98 |
+| AirMax | PoE injector + BulletAC IP67 | 24    | 0.3     | 7        |
+| 4G router | Teltonika RUT950 | 12    | 0.6     | 7        |
+| SignalLED | Hella Marine NaviLED 360 | 12 | 0.08 | 0.96|
+| Hydrophone | Thelma TBR700RT | 5    | 0.0044 | 0.022 |
+| Motors Full | Torqeedo Ultralight 403 | 24-32    | Varies | 2x400     |
+^ Total ^       ^ ^        ^ 833.762 ^
+Note that the power usage of the hydrophone is based on the TBR700 battery usage of 6 mA at 3.6 V, and
+the TBR700RT may use a some small amount more.