The components on MD4000 single board computer run on 3.3VDC (nominal). If 3.3V are
supplied directly to the MD4000 board (eliminating the DC-DC converter) then the
system is intrinsically safe since sparks do not occur at that low voltage.
The power requirements for the mesh node vary between 12 - 16 W
depending on the number of radios employed. The higher amperage required at this
low voltage requires a connector that supports 5-6 Amps. The Intrinsic Safe
(IS) node enclosure
needs to use power
connectors other than the RJ45
connectors that are limited to in amp capacity.
Additionally, low voltage portable power sources are needed to power the mesh
The cell stack portable power supply shown below consists of seven 3.6VDC
cells in parallel. Each cell has a capacity of 20 Amp-Hrs. The seven cell stack
has an aggregate capacity of 140 Amp Hours - sufficient to power the mesh node
for a 24 hour period. Note that the battery capacity is adjustable - based
on the number of cells in the cell stack.
Please contact Meshdynamics for details on the connector modifications and
integration with low voltage portable power sources.