Spektrum SPMAR9110 - Manual (Page 8)

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• SPM9014 36” Remote Receiver Extension
• SPMEXEC312 12” EC3 Extension
• SPMEXEC324 24” EC3 Extension
• EFLAEC302 EC3 Battery Connector, Female (2)
Battery Requirements
Using One Battery
The PowerSafe allows the option of using one or two battery packs. When
using one battery simply plug the battery into either one of the two battery
connectors (BATT 1 or BATT2). Be sure to secure the unused battery connector.
Note that the open contacts of the unused battery are not back powered (not
electrically hot), however, the unused connector should be secured to prevent
it from entangling during flight. When the system is powered using one battery,
a single blue LED will constantly emit when the system is powered.
Using Two Batteries
The PowerSafe offers a true redundant dual battery system. When using two
battery packs, each pack functions independently and is isolated from the
other, so that if one pack should fail (open circuit, short circuit, or become
discharged), the other battery will provide power to operate the system.
When using dual batteries it’s important that both batteries be of the same
capacity and ideally of the same age and condition. Note: It’s normal for one
battery to discharge slightly more than the other. This is the nature of a truly
redundant isolated battery system. The battery that has the higher voltage or
lower internal resistance will discharge at a faster rate. Generally the difference
is negligible (less than 10%). Because of this it’s normal for only one blue LED
(Batt 1 or Batt 2) to be on when the system is not under a heavy current load
depending on which pack is providing more power. When using two batteries,
the total available capacity equals the sum total of both batteries e.g.,
BATT1—2000mAh + BATT2- 2000mAh = a total capacity of 4000mAh.
Note: 12” and 24” EC3 battery extensions are available for installations
where the battery is located a distance from the main PowerSafe unit.
Using Dual Voltage Regulators
Spektrum offers a 7.5-amp (11-amp peak) 6.0-volt regulator (SPMVR6007)
specifically designed for use with the AR9110 PowerSafe. Important: When
using two batteries powered through two regulators, each regulator operates
independently and it’s common for one battery to be discharged at a slightly
higher rate depending on the condition of the battery (internal resistance,
voltage, etc.) and the tolerance of the regulators. This causes one battery to
discharge before the other and it’s important to check each battery using a
loaded battery tester (HAN171) at a recommended 1-amp load before each
flight monitoring the voltage of each pack and recharging when the weakest
pack reaches 40% capacity. (See Battery Capacity)