SV-BAT-320 Backup Battery Installation
9-4 SkyView System Installation Guide - Revision AA
SV-BAT-320 is Automatically Charged in Flight
An SV-BAT-320 connected to a SkyView display is automatically charged by the SkyView display
when there is adequate power applied to the SkyView display. If the SV-BAT-320 becomes
discharged, on the next flight the SkyView display will automatically charge the SV-BAT-320.
Charging, when necessary, required a minimum input voltage of 12.25 Volts supplied to the
SkyView display. To prevent discharging the aircraft battery excessively (when not in flight), the
SkyView display will not attempt to charge the SV-BAT-320 when the input voltage to the
SkyView display is lower than 12.25 volts.
Charging the SV-BAT-320 on Ground or During Aircraft Construction
As with all new lithium-ion batteries, the SV-BAT-320 is manufactured, stored in
inventory (Dynon Avionics, dealers, and aircraft manufacturers), and shipped in a
partially-charged state. Occasionally, typically after a year or more with no
charging, the SV-BAT-320 may appear to be fully discharged – the SkyView display
may not be able to detect that a battery is installed.
To prevent becoming totally discharged, all lithium-ion batteries, including the SV-
BAT-320, incorporate internal safety circuitry (protection mode) that will
disconnect the load (SkyView display) when the lithium-ion battery’s state of
charge is very low.
Prior to Software v15.0, SkyView displays could not detect when an SV-BAT-320
was in this state (protection mode due to low state of charge) and thus the
SkyView display would not attempt to charge the SV-BAT-320. Software v15.0 and
later incorporates an improvement to the charging algorithm; the SkyView display
is able to detect this state and charge an SV-BAT-320 that is in protection mode.
As explained above, to prevent discharging the aircraft battery excessively (when not in flight),
the SkyView display will not attempt to charge the SV-BAT-320 when the input voltage is lower
than 12.25 volts. During aircraft construction, or if the aircraft will not be flown for an extended
period, the SkyView display can charge the SV-BAT-320 if the following conditions are met:
For each SkyView display that will be charging an SV-BAT-320, the aircraft’s battery
charger must be able to supply at least 5 amps (5A) (for a 12 volt electrical system; 2.5A
for a 24 volt electrical system). If you have two SkyView displays with SV-BAT-320s, and
you wish to charge them simultaneously, the battery charger must be capable of
supplying 10A.
Under full load (5A), the aircraft battery charger must be capable of supplying 13 volts
(13V) to the SkyView display. Supplying 13V to the aircraft electrical system allows for
voltage drops in the electrical system, ensuring that the SkyView display receives at
least 12.25V that is required to charge an SV-BAT-320.
It may take as long as four hours (4H) to fully charge a fully discharged SV-BAT-320.
To charge an SV-BAT-320, the SkyView display must be powered ON and fully booted
up. The SkyView Software monitors the charging process; if the SkyView display is
powered off, the SV-BAT-320 will not be charged.
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