Blue Sea Systems 7521 P12 Battery Charger - 12V DC 25A - Manual (Page 24)

Specifications are subject to change. See bluesea.com/P12 for current information.
Optional Installation
SI-ACR and
m
-ACR Installation Instructions (PN 7610 and PN 7601) to Enable Start Isolation
1. Disconnect the DC Negative (Ground) wire going to the ACR.
2. If present, disconnect the Start Isolation wire connected to ACR.
3. Connect a wire from the ACR 1 port marked “SI” (Start Isolation) on the P12 Battery Charger to the Start Isolation terminal (SI) on the ACR.
4. Connect a wire from the ACR 1 terminal marked “ES” (Engine Start Switch) on the P12 Battery Charger to the terminal or wire running from the start key switch to
the starter solenoid. Make this connection through an in-line fuse of 1 to 10 Amps.
Integrate the P12 Battery Charger with Blue Sea Systems Automatic Charging Relays to take
advantage of Charge Coordination.
NOTE: If you have a Blue Sea Systems ACR with Start Isolation, it is possible to take advantage of your P12 charger’s ability to integrate in order to optimize
charging of your batteries.
Automatic Charging Relays (ACRs) combine battery banks when a charging voltage is present in order to share charge between battery banks. However, due to the P12 Battery
Charger’s ability to independently optimize charging for each battery bank it is favorable to isolate all battery banks by disengaging the ACR(s) ability to combine.
NOTE: The P12 Battery Charger can integrate with up to two Automatic Charging Relays (ACRs)
NOTE: This connection can be made at the start key switch or at the starter solenoid, but must be to the line that is +12V DC positive only when cranking. Connection
to a line that is positive while the engine is normally running will prevent the charging relay from working properly.
5. Re-connect DC Negative (Ground) wire on the ACR
6. If connecting two ACRs, repeat steps 1 through 5 using the second ACR, engine, and the P12 Battery Charger ports associated with ACR 2
22
Automatic
Charging
Relay
GR
OUND
ST
ART
ISOLA
TION
REMO
TE LED
Automatic
Charging
Relay
GR
OUND
ST
ART
ISOLA
TION
REMO
TE LED
ENGINE
START
SWITCH ON
OFF
START
ENGINE
START
SWITCH ON
OFF
START
FUSE FUSE
Temperature
Sensor
Remote
Display
ACR 1 ACR 2
SI: Start Isolation (ACR)
ES: Engine Start Switch
ES SI ES SI
Temperature
Sensor
Remote
Display
ACR 1 ACR 2
SI: Start Isolation (ACR)
ES: Engine Start Switch
ES SI ES SI
7520
BATTERY CHARGER LED REMOTE
OPTIONAL CONNECTION OPTIONAL CONNECTION
START
START
HOUSE
FUSE FUSE
FUSE
FUSE
DC GROUND
P12
7521 AND 7522 BATTERY CHARGERS