ML-x17 DATA LOGGER MANUAL
Manufacturers of low power instruments
page 123
4.48 Power supply
The data logger PCB is designed to work with a power supply of minimum 0.8 to maximum 5V DC
The ML-
x17 can be supplied with different power provision PCB’s mounted in the enclosure cover.
Power supply
Description
ML-
x
17
y-
LI
Powered from a single 3.6V DC SAFT LSH20 or equivalent D-size lithium battery.
ML-
x
17
y-
3LI
Powered from 3x 3.6V DC SAFT LSH20 or equivalent D-size lithium batteries.
ML-
x
17
y-
DC
Powered from external 8..28V DC source.
ML-
x
17
y-
DC-LI
Powered from external 8..28V DC source or 3.6V DC SAFT LSH20 lithium battery.
ML-
x
17
y-
DC-NM
With integrated 3 x AA NiMH holder & charger for external 8..28V DC source.
ML-
x
17
y-
PV
With integrated 1Wp solar panel and 1x 26650 3.2V LiFePO4 holder &charger.
ML-
x
17
y-
LFP
With 4x 18650 3.2V LiFePO4 holder & charger for 12V (21VOC) ext. solar panels.
ML-
x
17
y-
SLA
With integrated 12V battery charger for 12V (21VOC) external solar panels.
4.48.1 Internal RTC backup battery
The data logger contains an internal coin cell battery to keep the internal real-time-clock running. The
lifetime of the battery is at least 10-20 years, so this battery requires no exchange during the lifetime of the
data logger.
4.48.2 Power consumption & Battery Life
Average current consumption @3.6V
Subject
Value
Remarks
Data logger in low power sleep
<100uA Preferred mode of operation.
Data logger in MODEM sleep
2mA
MODEM in stand-by during SMS ACVA reception.
Data logger is awake
65mA
The logger is awake to be able to take and log a
measurement.
Data logger is transferring GPRS
data
220mA
Requires a good GPRS signal.
The data logger is equipped with an internal power monitor. During the active mode of the data logger, this
power monitor keeps track of the power consumption of the device. When the device is going into sleep-
mode, a fixed value is used to calculate the power consumption. Both are calculated and offer a fairly
accurate measurement of the power consumption. Unfortunately, the behaviors of batteries are, in practice,
much more complicated than the calculation made inside the data logger. So, the capacity, written on the
back of the battery is only a typical value. Things like: Shelf life, ambient temperature, current draw, and
peak current draw, affect the performance of the battery.
Therefore, we strongly advise to use the measurements regarding battery life as an indication only. We
also recommend replacing the battery, fairly above 0%. If you want the best performance and the most
optimized settings for your particular measurement location, contact the supplier of the Battery
(
). They can provide you more specific details and advise on your application. You
can provide them information by sending them a bit of previously measured data, for analysis. When you
have received the advice, you probably decrease the value of “Battery Capacity” in the configuration setup,
to a bit lower value than the default (14 Ah)
When using the cover with integrated NiMH AA solar charger, we recommend to use LSD (long self-
discharge) NiMH AA rechargeable batteries with at least a capacity of 2000mAh (e.g. GP Recyko, Sony
Eneloop or Vapex Instant).
Please consult the
