Enabling better global research outcomes in soil, plant & environmental monitoring.
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3. Charging the SMM Internal Battery
The SMM is a self-contained instrument that incorporates a lithium polymer battery. This battery
should be charged before using the instrument. A range of charging options are described on the
next few pages.
The SMM has an internal battery which can supply power for several hours to days depending on
frequency of use. ICT International recommend the internal battery be charged with a solar panel
or other 24V power supply (for example, the ICT CH24 100 - 240Volts AC Mains to 24Volts DC
power supply adapter).
The SMM accepts 8 to 30 volts DC input, maximum charge rate of 200mA is active when the
external voltage rises above 16 Volts DC.
An external power supply can be connected to the SMM in the field. See Connecting a Power
Supply to the Instrument (Field Operation) (pages 10 & 11) for more details.
The unique power-bus plug design was developed by ICT International to simplify the electrical
wiring process. It minimises the need for custom tools in the field requiring only that the outer cable
sheath be stripped back to expose the copper wire.
As shown in Connecting a Power Supply to the Instrument (page 6) no other tools are required
with all necessary components and fixings fully incorporated into the instrument design. Retaining
straps ensure the power-bus plugs do not separate from the instrument when removed from the
power-bus during wiring preparation and connection of external power.
