USER MANUAL
STM 429J – Scavenger Transmitter Module
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STM 429J User Manual | v2.0 | Nov 2017 | Page 11/ 17
2.5
Energy consumption
Charge needed for one measurement and transmit cycle: ~80 µC
Charge needed for one measurement cycle without transmit: ~10 µC
Calculations are performed on the basis of electric charges because of the internal linear
voltage regulator of the module. Energy consumption varies with voltage of the energy
storage while consumption of electric charge is constant.
From these values the following typical performance parameters at room temperature have
been calculated:
Wake and
transmit
cycle [s]
Operation Time in darkness
[h] when storage fully
charged
Required reload time [h] at 200 lux
within 24 h for continuous operation
1500
175
1.8
Assumptions:
Internal storage PAS614L-VL3 (after several days of operation at good illumination
level) with 0.25 F, Umax=3.2 V, Umin=2.3 V, T=25 °C
Consumption: Transmit cycle 80 µC, measurement cycle 10 µC
Pre-installed solar cell ECS 300, operating values 3 V and 5 µA @ 200 lux fluorescent
light
Current proportional to illumination level (not true at very low levels!)
These values are calculated, the accuracy is about +/-20%! The performance varies over
temperature and may be strongly reduced at extreme temperatures.
