bus is powered by TR3; the hot battery bus and switched hot battery bus are powered by the battery/battery charger.
Alternate Operation
Single Battery YA801 - YA803
The alternate power source for standby power is the battery. With the standby power switch in the AUTO position, the loss of all engine or APU electrical power causes the battery to power the standby loads, both in the air and on the ground. The AC standby bus is powered from the battery via the static inverter. The DC standby bus, battery bus, hot battery bus, and switched hot battery bus are powered directly from the battery.
The standby power switch provides for automatic or manual control of power to the standby buses.
In the AUTO position, automatic switching from normal to alternate power occurs if power from either AC transfer bus 1 or DC bus 1 is lost.
Copyright . The Boeing Company. See title page for details.
6.20.16  September 26, 2003

Electrical -System Description
737 Flight Crew Operations Manual
Positioning the switch to BAT overrides automatic switching and places the AC standby bus, DC standby bus, and battery bus on battery power. The battery switch may be ON or OFF. If the battery switch is OFF, the switched hot battery bus is not powered.
Positioning the standby power switch to OFF de–energizes both the AC standby bus and the DC standby bus and illuminates the STANDBY PWR OFF light.
Dual Battery YA613 - YA722, YA809 - YK104
The alternate power sources for standby power are the main battery and auxiliary
battery. With the standby power switch in the AUTO position, the loss of all
engine or APU electrical power causes the batteries to power the standby loads,
both in the air and on the ground. The AC standby bus is powered from the
batteries via the static inverter. The DC standby bus, battery bus, hot battery bus,
and switched hot battery bus are powered directly from the batteries.

The standby power switch provides for automatic or manual control of power to

the standby buses.
In the AUTO position, automatic switching from normal to alternate power occurs
if power from either AC transfer bus 1 or DC bus 1 is lost.

Positioning the switch to BAT overrides automatic switching and places the AC
standby bus, DC standby bus, and battery bus on battery power. The battery switch
may be ON or OFF. If the battery switch is OFF, the switched hot battery bus is
not powered.

Positioning the standby power switch to OFF de–energizes both the AC standby
bus and the DC standby bus and illuminates the STANDBY PWR OFF light.

Static Inverter
The static inverter converts 24 volt DC power from the battery to 115V AC power to supply the AC standby bus during the loss of normal electrical power. The power supply to the inverter is controlled by the standby power switch and the battery switch on the overhead panel.
Copyright . The Boeing Company. See title page for details.

September 26, 2003  6.20.17
Electrical -System Description

Standby Power System Schematic
YA801 - YA803

Copyright . The Boeing Company. See title page for details.
6.20.18  September 27, 2004

Electrical -System Description 737 Flight Crew Operations Manual
YA613 - YA722, YA809 - YK104

Copyright . The Boeing Company. See title page for details.
September 27, 2004  6.20.19
Electrical -System Description 737 Flight Crew Operations Manual

All Generators Inoperative
YA801 - YA803 The following list identifies the significant equipment that operates when the battery is the only source of electrical power.
YA613 - YA722, YA809 - YK104 The following list identifies the significant equipment that operates when the main battery and the auxiliary battery are the only source of electrical power.
Airplane General
.  
standby compass light

.  
white dome lights

.  
emergency instrument flood lights

.  
flight crew oxygen

.  
passenger oxygen
YC411, YC413

.  
standby forward airstair interior/exterior operation

Air Systems
.  
A/C pack valves

.  
BLEED TRIP OFF lights

.  
manual pressurization control

.  
altitude warning horn
YA613 - YA809

.  
PACK TRIP OFF lights
YC153 - YK104

.  
PACK lights

Anti-Ice YA613, YA626, YC153 - YC413, YK101 - YK104
.  Captain’s pitot probe heat
Communications
.  
flight interphone system

.  
service interphone system

.  
passenger address system

.  
VHF No. 1
　
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