Spektrum SPMAR12120 - Manual (Page 8)

EN
8
Battery Voltage
IMPORTANT: D0 NOT use a 4-cell 4.8-volt battery to power the PowerSafe.
Four-cell 4.8-volt batteries do not provide enough voltage headroom (additional
margin needed) necessary to power the system when heavily loaded. Under load
the system voltage can drop below the voltage system’s minimum operating
voltage threshold (3.5 volts) and cause loss of control.
The PowerSafe is capable of handling voltages from 6.0 to 10.0 volts. The voltage
limitations are generally the servos. Most servos are compatible with 5-cell 6-volt
packs. Five-cell 6-volt NiMH packs have become the standard for many giant-scale
applications.
Be aware that NiMH batteries have a tendency to false peak when being fast char-
ged. Be especially careful when using NiMH batteries that they are fully charged
and have not false peaked.
Many pilots are using 2-cell LiPo batteries to power their aircraft. LiPo’s offer
greater capacity for their size and weight, and are easier to manage when charging.
Before using LiPo batteries, please check the voltage specifications of your servos.
Use of a voltage regulator, such as the Spektrum VR6007 (SPMVR6007), might be
necessary.
When a battery is connected to the PowerSafe, a low current drain of less than
1mA occurs even when the switch is turned off. If the system is going to be stored
for any length of time, it’s important that the battery(s) be disconnected from the
PowerSafe to prevent over discharge.
Installation
The PowerSafe requires a minimum of three remote receivers to operate, and
one receiver must be plugged into the A receiver port. Four remote receivers
are included and, in most cases, it is recommended that three or four receivers
be used. Each receiver functions independently and additional receivers (up to
four) offer a more secure RF link in difficult environments. The added security of
redundancy should a failure occur will outweigh the slight additional penalties of
cost and weight.