AG Publications Aquafax Equipment Catalogue

VOLTAGE SENSING RELAYS

www.aquafax.co.uk

BLUE SEA AUTOMATIC CHARGING RELAYS

SI-ACR (START ISOLATION) & BATTERYLINK™ AUTOMATIC CHARGING RELAYS

Specifications: Intermittent rating: 5 min.

210A DC 120A DC

Continuous Rating: Closed current draw: Open current draw:

SI-ACR automatically combines batteries during charging, isolates batteries when discharging and when starting engines. BatteryLink™ ACR automatically shares single source of charge with Auxiliary Battery. • 120A continuous rating – supports high-output alternators.

175mA

15mA

Cable size to meet current ratings:

1 AWG (50mm 2 ) 1/0 AWG (50mm 2 )

Maximum cable size: Terminal stud size:

3/8" -16 (M10)

• 12/24 volt auto ranging voltage input. • Senses charging on two battery banks. • Side and bottom knockouts for power cable connections. • Clip on cover protects and insulates terminal connections. • 7/8" (22mm) stud length to accept multiple cable terminals. • Integrated LED indicates ACR status.

Relay Contact Position:

12V DC

24V DC 27.2V DC 26.0V DC 24.7V DC 25.5V DC 30.0V DC* 19.0V DC 20.0V DC

Combine:

(30 sec) (2 min) (10 sec)* (30 sec)

13.6V DC 13.0V DC 12.35V DC 12.75V DC 16.0V DC 9.5V DC 10.0V DC

Open low:

PART NO. DESCRIPTION

Over Voltage Lockout Under Voltage Lockout* Under Voltage Recovery*

8-27610

SI-ACR

8-27611

BatteryLink™

• 1/4" x .032" male quick connect terminals for ground & optional features. • Max battery size not to exceed 850 CCA Cold Cranking Amps (BatteryLink Only). Optional Features • SI-ACR Start Isolation allows temporary isolation of House loads from Engine circuit during engine cranking to protect sensitive electronics from sags and spikes. • BatteryLink™ Optional Auxiliary Battery Priority connection shares the alternator charge with the Auxiliary battery longer when the engine is running to allow the use of auxiliary loads for an extended period of time. • Remote LED remotely indicates ACR states - requires optional LED (p.591). Regulatory • CE marked • Meets ISO 8846, and UL 1500 and SAE J1171 external ignition protection requirements. • IP67 - protected against temporary immersion for 30 mins AUTOMATIC CHARGING RELAYS EXPLAINED In a boat with two battery banks, it is useful to be able to charge both banks while underway. Charge management devices connect two battery banks when charging, and isolate them from each other when not charging. If one battery becomes depleted, there will be a charged bank available for emergency starting. There are two main types of charge management devices used on boats: Automatic Charging Relays use a relay combined with a circuit that senses when a charging source is being applied to either battery. When a charge is being applied, the ACR combines the batteries. When there is no charge present, the ACR isolates the batteries. Battery Isolators are one-way electrical check valves that allow current to flow to, but not from, the battery. Their disadvantage is that the diodes used to achieve this cause a voltage drop that consumes charging energy, creates heat, and causes batteries to be undercharged. Although alternators with external voltage sensing can correct for undercharging, voltage drop and heat remain a problem. WHEN CHOOSING AN ACR, CONSIDER: Current Management. ACRs can be exposed to very high currents if the engine is cranked while the ACR has combined the batteries. This can occur when a charge source other than the alternator, such as a solar charger, has caused the ACR to close. Blue Sea Systems offers two solutions: ML- Series ACRs (p.547), have high amperage contacts rated for engine starting, and the SI- Series ACR momentarily opens the relay, isolating the two batteries during starting. Remote Control. The ML- Series & SD-Series ACRs include a Remote Control Contura Switch for controlling from a helm station or other convenient location. Manual Override . In addition, ML- Series ACRs have a local manual control knob to combine battery banks in an emergency. Start Isolation. These ACRs can be configured for Start Isolation, which provides temporary isolation of house loads from the engine circuit during engine cranking. This protects sensitive electronics from voltage sags and spikes in the starting circuit.

Auxiliary Priority - Optional Feature Open low: 30 sec

12.25V DC

24.5V DC

*Applies to SI-ACR Only.

555

Battery Isolator vs. Automatic Charging Relay (ACR)

An ACR passes the current from one battery to the other

An isolator splits the current

Automatic Charging Relay (ACR) Operation

Legend

ACR OPEN - batteries are isolated. ACR COMBINED - batteries are connected and are both charging. ACR relay is open and batteries are isolated. Voltage begins to rise slowly after engine starts or battery charger is turned on. When voltage rises to COMBINE voltage set on ACR; 13.5V in this example, ACR relay closes, connecting and charging both batteries. When engine stops or battery charger is turned off, voltage rapidly begins falling. When voltage falls to ISOLATE voltage 12.75 in this example ACR relay opens, isolating batteries while discharging. 1 2 3 4