通导系统的就只有一组蓄电池。

供全船其他系统的一般是两组， 下面是DNV 规范中 ，关于 INSTALLATION  的部分，似乎没有提到必须要两组，参考一下吧。 SOLAS 里面也差不多{b)The emergency source of electrical power may be either a
generator or an accumulator battery. (Interpretation of
SOLAS Ch. II-1/43.3).}
Rules for Ships / High Speed, Light Craft and Naval Surface Craft, January 2005
Pt.4 Ch.8 Sec.2  –  Page 20

102    Battery powered systems
a)Each battery powered system is to have a separate charg-
ing device, suitable for the actual service. This may alter-
natively be:
—a charging device supplied from the vessel's primary
or secondary electric distribution. Such charging de-
vices are c*****idered as important c*****umers
—a charging dynamo driven by one of the engines which
the battery normally supplies, except that this is not al-
lowed for auxiliary engines for emergency generator
and emergency fire pump.
b)Each starting battery required by these rules shall have an
independent charging device.
c)Each charging device is, at least, to have sufficient rating
for recharging to the required capacity within 6 hours,
while the system has normal load.