Senquip ORB Manual page 6

Document Number
APN0033
Title
Powering a Senquip Device with Solar
Figure 9 - Water Level Sensor Running 173 Days Without External Power
Boot time can vary drastically depending on the sensor chosen. For instance, the VEGAPULS C 21 Two-wire 4 ... 20
mA radar sensor specifies a run-up time of 15 seconds (Figure 10). In addition, 0-999 seconds of damping can be
applied. Many of these radar sensors are used successfully with Senquip devices in solar applications, consideration
does however have to be given to the measurement interval because with a start time of 15 seconds vs 1 second for
the pressure based sensor, the radar sensor will use 15 times more energy.
Figure 10 - VEGAPLUS C21 Radar Level Sensor Boot Time
When designing a solar system, the sensor plays a critical role in determining the power consumed from the internal
battery. So far, we have discussed 4-20mA sensors, however it may be more suitable to use voltage output sensors,
or Modbus sensors that draw less than 4mA.
Insight 4: Use low power sensors and consider power draw and total measurement time.
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Revision
1.0
without the prior written consent of the Company.
Prepared By
NGB
Approved By
NB
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