DPSI RV Mini Family Operating Instructions Version 1.0
Page 29 of 54
6-cell NiCd batteries are also connectable. This only makes sense if
the output voltage for the servos is set to "Bat." and servos with a
corresponding higher supply voltage are connected (e.g. 7.4V servos).
Usually 5-cell NiCd/NiMH or 2-cell LiPo batteries are used.
Battery capacities
In general observe current load and capacities of the utilized batteries.
Battery packs of 2 times 450mAh are far too small for a model carrying
10 servos. There should be at least two "2000th" which can be
discharged with 5C (peak current). (C is nominal capacity in Ah => a
battery with 2Ah can be loaded with 5 * 2A = 10A at 5C). Especially
when using digital servos higher current consumption must be
observed.
Our elaborated measurements with a 3m model using 15 digital servos
resulted in a current consumption of about 0.6 – 0.8Ah at 10 minutes
flight time. Dimension your batteries very carefully! If in doubt, ask your
model manufacturer.
Furthermore, make sure, that the connection cables of the battery are
thick enough when selecting the batteries. If a battery with 0.25 mm
2
cable area is being used, the advantage of using the DPSI is lost
because of losses in such thin cables. Therefore, battery wires for
large models should have an area of 1.0 – 1.5mm
2
.
Solder the battery connection cables to the delivered Multiplex high
current connectors to make them compatible to the DPSI RV Mini (if
no readily conditioned batteries are utilized). Shrink tubes for isolating
the solder connections are delivered as well.
If the batteries must be placed far away from the DPSI RV Mini due to
COG (Center of Gravity) purposes (long connection cables) it is
desirable to twist the wires. We recommend using our EMCOTEC
Lithium Polymer batteries. These are delivered completely wired and
can be connected to the DPSI RV Mini right away. An additional
charging connector at the battery allows for charging without removing
the battery from the DPSI. Charging devices for all battery types are
available from EMCOTEC, too.
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