Blue Sea Systems P12 P12

Speciﬁcations are subject to change. See bluesea.com/P12 for current information.

DC Safety

Ground

Battery 2 Battery 3Battery 1

Line Neutral Ground

AC Connections

#8 (M4) Ring Terminals

DC Connections

1/4" (M6) Ring Terminals

Fuse Fuse Fuse

Temperature

Sense

RJ11 Port

Remote

Display

RJ45 Port

Installation Instructions (continued)

NOTE: If you have a Blue Sea Systems ACR with Start Isolation it is possible to take advantage of the P12 Battery Chargers ability to integrate with it. The P12

is designed to charge three electrically independent batteries or battery banks. The P12 has the unique capability to individually move each battery out of

Absorption charging stage. This ensures batteries near their full charge do not continue to receive high constant voltages necessary in the Absorption stage. This

is optimal treatment for long battery life. Charge Coordination integrates with the Blue Sea Systems family of Automatic Charging Relays (ACR) to force separation

of the battery bank while the P12 is operational, to allow the batteries to individually exit the absorption stage. (see pages 22–23)

6. Route the AC wires from the charger to the AC panel and terminate wires at the charger.

7. Make the AC source connections to the appropriate panel circuit breaker and leave in the “off” position. (see Table D page 5).

NOTE: Connect AC wiring, but do not energize the circuit until AC covers are installed, DC is connected, and DC fuses are installed.

Wiring Connections

1. Attach the battery charger remote connection to the back of the P12 Battery Charger Remote using dielectric grease. Connect to the Remote Display/Com

port of the charger.

2. Connect the Automatic Charging Relay(s) (ACR) wire to the ACR Connection port(s)

Optional Installations see pages 22–23

8. Recommended Connection: Attach the battery temperature sensor wire to the largest battery bank. If all battery banks are the same size attach to bank with the most loads.

Blue Sea Systems recommends using a high quality dielectric grease for remote control and temperature sensor connections.

a. Attach the sensor in the center of the long side of the battery.

b. If multiple batteries are in a battery bank attach sensor in the center between multiple batteries.

c. When external circumstances could create a signiﬁcant difference in temperature on one side of a battery versus another, always attach temperature sensor

on warmest side.

9. Install appropriate DC Fuses. (see Table B page 5)

10. Conﬁrm all connections are accurately installed per

Wiring Connections Diagram.

11. Secure AC and DC strain relief covers and fasten down.

12. Secure the termination cover back over the connected wires

and latch the yellow tabs.

13. Restore AC power and turn on the AC supply circuit

breaker to the battery charger.

14. Perform the chargers setup procedure as outlined in

Initial Charger Setup page 11.

P12

7521 AND 7522 BATTERY CHARGERS