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

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

Rugged, finned
cast aluminum case

Fan vent

Screen selection 

buttons

Charging stage 

indicators

Termination 
cover latches

Charging and 
Alert indicators

Graphic LCD Display

Termination 
insulating 
cover

DC output

DC strain 
relief clamp

AC strain 
relief and 
insulating cover.
AC input terminals
under cover.

Mounting holes

Clearance for:
M6, 1/4", or #12
mounting hardware
NOTE: Mounting holes screw 
centers are not symmetrical. 
Please see dimension drawing 
on page 6

P12 Battery Charger Overview

4

P12

 7531 AND 7532 BATTERY CHARGERS

Specifications

5

*  Consult battery manufacturer specifications for other battery types to avoid damage. Do not mix battery types. 
** Battery bank sizes are tested to California Energy Commission compliance (CEC). Larger and smaller size banks could charge well, but consume slightly 
  more power over the charging cycle. 

Regulatory

Designed and constructed for compliance to UL-1236 Marine, CSA 22.2 No. 107.2, and ABYC A-31 standards. 
CE Marked
Ignition Protection per ISO 8846 and SAE J1171. Meets FCC Part 15, Class B requirements. To view all regulatory specifications visit www.bluesea.com/P12.
California Energy Commission (CEC) compliant. The energy saving feature may be disabled by the user following the steps on page 14 of this manual.

7531

7532

Total Output Current (continuous)

25A

40A

Input AC Current

4.5A @ 115V AC / 2.25A @ 230V AC

7.5A @ 115V AC / 3.75A @ 230V AC

Nominal Output Voltage

12V DC

12V DC

Output Connections

3 positive, 1 negative

3 positive, 1 negative

Universal AC Input Voltage

115–230V AC

115–230V AC

Input Frequency Range

50–60 Hz

50–60 Hz

Typical Float Voltage

13.5V DC

13.5V DC

Output Voltage Accuracy

0.05V DC

0.05V DC

Minimum Operating Temperature

−20°C (−4°F)

−20°C (−4°F)

Full Output Maximum Temperature

45°C (113°F)

45°C (113°F)

Minimum Storage Temperature

−30°C (−22°F)

−30°C (−22°F)

Maximum Storage Temperature

80°C (176°F)

80°C (176°F)

Warranty

5 Year

5 Year

Battery Types*

Flooded, Gel, AGM, TPPL 

(Thin Plate Pure Lead)

Flooded, Gel, AGM, TPPL 

(Thin Plate Pure Lead)

Recommended for Battery Bank Sizes**

60Ah Minimum, 

Example: 1 x Group 24

330Ah Maximum, 

Example: 3 x Group 31

60Ah Minimum, 

Example: 1 x Group 24

440Ah Maximum, 

Example: 4 x Group 31

Conductor Length in feet (meters)

Charger Rating

25A

40A

6 ft (1.83 meters)

14 AWG (2.5mm²)

8 AWG (10mm²)

10 ft (3.05 meters)

12 AWG (4mm²)

8 AWG (10mm²)

15 ft (4.57 meters)

10 AWG (6mm²)

6 AWG (16mm²)

20 ft (6.09 meters)

8 AWG (10mm²)

6 AWG (16mm²)

25 ft (7.62 meters)

6 AWG (16mm²)

4 AWG (25mm²)

Recommended Battery Fuse

30A

60A

Region

Line

Neutral

Ground (Earth)

North America

Black

White

Green

Europe

Brown

Blue

Green-Yellow

Australia/ New Zealand

Brown or Red

Blue or Black

Green-Yellow

Table A: 

Minimum Recommended Wire Size*

Appropriate Fuses and Fuse Holders

Charger Rating

Fuse Type

Fuse Holder

25A

40A

MRBF Terminal Fuses

5191 Terminal Fuse Block

5175 (30A Fuse)

5178 (60A Fuse)

AMI®/MIDI® Fuses

7720 Safety Fuse Block

5250 (30A Fuse)

5253 (60A Fuse)

Table B: 

Recommended DC Circuit Protection

Table C: 

Typical AC Regional Wire Colors

Table D: 

AC Wire - Circuit Protection Selection Chart

7531

 (25A)

7532 

(40A)

Input Watts

450

750

120V AC Application

4.5A @ 100V AC

7.5A @ 100V AC

Minimum AC Wire Size

18 AWG (0.75mm²)

16 AWG (1.5mm²)

Circuit Breaker

10A

15A

230V AC Application*

2.25A @ 200V AC

3.75A @ 200V AC

Minimum Wire Size

18 AWG (0.75mm²)

18 AWG (0.75mm²)

Circuit Breaker

5A – 10A

5A – 10A

Typical of Europe

Type

Absorb Volts

Float Volts

FLA – Flooded Lead Acid

14.5V

13.5V

AGM – Absorbed Glass Mat

14.35V

13.3V   

Gel – Gelled Electrolyte

14.1V

13.5V

TPPL – Thin Plate Pure Lead

14.7V

13.6V

¹

User Adjustable

12.5V 

Default

12.5V 

Default

¹

 Taken from Odyssey Tech Notes, Northstar operation Manual

Table E: 

Default Voltages by Battery Type

Batteries should match in chemistry, although many AGM’s and flooded batteries are 
compatible. Based on 25°C (77°F)

*

 Based on 3% voltage drop.  If fast charge recovery is important, use larger wire.  Double the conductor 

   length entry to get a 1.5% drop, triple the conductor length to get a 1% voltage drop.

P12

 7531 AND 7532 BATTERY CHARGERS

Summary of Contents for 7531

Page 1: ...perational instructions for P12 Battery Chargers This User Manual describes the product mentioned herein at the time of its publication Specifications and performance are subject to change at the disc...

Page 2: ...ation cover there are no user serviceable parts within the battery charger enclosure Contact Blue Sea Systems for servicing Charge only user selectable type batteries other types of batteries may burs...

Page 3: ...anks may finish charging at different rates Once a battery bank has met its unique Absorption parameters the P12 Charger will independently move it into the Pre Float stage Pre Float is the initial st...

Page 4: ...F 30 C 22 F Maximum Storage Temperature 80 C 176 F 80 C 176 F Warranty 5 Year 5 Year Battery Types Flooded Gel AGM TPPL Thin Plate Pure Lead Flooded Gel AGM TPPL Thin Plate Pure Lead Recommended for...

Page 5: ...rewdriver Dielectric Grease Used for Temperature Sensor and the Optional Accessory P12 Remote Display Connections View the MSDS for the Dielectric Grease at bluesea com P12 Temperature Sensor Flying l...

Page 6: ...Wiring Connections Diagram page 10 4 Then remove the AC and DC wire termination strain relief clamps by unfastening the screws AC Connections Strain Relief DC Connections Strain Relief Best practices...

Page 7: ...ach 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 cr...

Page 8: ...you may adjust the length of seconds the backlight will remain on b The backlight timer can be adjusted between 5 and 59 seconds It may also be set permanently on or permanently off 15 Press the OK bu...

Page 9: ...ttings by default To disable this factory setting select Charger Setup Menu select Battery and then press the down arrow and select Set Absorb Timers Then press the down arrow four times to view Gener...

Page 10: ...k professional guidance before performing equalization Equalization causes off gassing of harmful chemicals inside of the battery Only perform equalization while the batteries are in a well ventilated...

Page 11: ...ating temperature based on the temperature sensor Read the Temperature Parameters section on page 15 before making any adjustments Options Select Units and temperature parameters to adjust How to Get...

Page 12: ...hout sufficient knowledge is dangerous and can cause personal or property harm If the battery temperature sensor goes outside a designated parameter contact your battery manufacturer for further infor...

Page 13: ...F START ENGINE START SWITCH ON OFF START FUSE FUSE 7520 BATTERY CHARGER LED REMOTE Sold Separately START START HOUSE FUSE FUSE FUSE FUSE DC GROUND OPTIONAL CONNECTION REMOTE DISPLAY START ISOLATION AC...

Page 14: ...as new condition Such repair or replacement will be the sole remedy by Blue Sea Systems under this warranty Any repaired or replacement product will be warranted in accordance with this warranty for t...

Page 15: ...425 Sequoia Drive Bellingham WA 98226 USA p 360 738 8230 p 800 222 7617 USA and Canada Customer Service conductor bluesea com www bluesea com 980025140 Rev 003...

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