Boston Whaler 37 Justice Series, Operation & Maintenance Manual, Page: 139 / 214

5-5
Electrical Systems Section 5
Automatic Charging Relays ( ACR)
The three battery banks on this boat are automatica lly co nnect ed in parallel through the use
of ACRs (Automatic Charging Relay) when a sufficient charging source is present. The battery
banks are automatica lly separated when the ch arging source falls below a ce rtain voltage level
for a predetermined amount of time. The ACRs are mounted on the forward bulkh ead of the
mechanical equipment compartment.
The use of ACRs eliminates the need for the operator to monitor battery voltage and deci de
whether or not it is oka y to parallel the battery banks. It also eliminates the ch ance of a dead
battery bank if a paralleling switch were left in the Combined position without a sufficient
ch arging source present.
The operation of the ACRs ca n be manually overridden by use of the kn ob on the top of the ACR.
Manual Control O verride
E ach of the remote battery switch es and ACR units has a manual override kn ob on the top of the
unit as an added level of safety that allows manual ON-OF F co ntrol with or without power and
provides L OCK OF F for servici ng the elect rica l system. Refer to the manufact urer’ s manual in
the operator’ s pac ke t for co mplete instruct ions, safety co nsiderations and warranty information.
ACR
ACR
CENTER ENGINE
BATTERY #1
CENTER ENGINE
BATTERY #2
STBD ENGINE
BATTERY
PORT ENGINE
BATTERY
PORT REMOTE
BATTERY SWITCH
AUTOMATIC
CHARGING
RELAY
CENTER REMOTE
BATTERY SWITCH
AUTOMATIC
CHARGING
RELAY
STBD REMOTE
BATTERY SWITCH
TO PORT
ENGINE
TO CNTR
ENGINE
TO STBD
ENGINE
TO MAIN
GROUND
BUS