BSS 7610 SI-ACR Automatic Charging Relay 12/24V DC 120A

An ACR automatically parallels (combines) batteries during charging, and isolates them when charging has stopped and after battery voltage has fallen. An ACR is intended to keep a load from discharging both of the batteries.  An ACR senses when the voltage of either of the batteries rises to a level indicating that a charge source is active (13.0V for 2 minutes). The ACR?s contacts then connect and the ACR applies the charge to both batteries. If the voltage on both of the batteries subsequently drops to 12.75V for 30 seconds, the ACR will disconnect, isolating the batteries. 

That said, how does an ACR differ from a battery isolator?  Battery isolators use one-way electrical check valves called diodes that allow current to flow to, but not from, the battery. ACRs use a relay combined with a circuit that senses when a charging source is being applied to either battery. ACRs are more efficient than battery isolators because they create little heat and consume minimal charging energy.

 An ACR will work with all charge sources, including an alternator, AC charger, or solar panel. However, low current charge sources might not produce the voltage rise required to force the ACR to combine.


Add Pros & Cons

Add a Pro Add a Con
Pros Cons
Protects sensitive electronics by temporary isolation of house loads during engine cranking
Ignition protected—safe for installation aboard gasoline powered boats
Supports high-output alternators up to 120 Amperes
12/24 volt auto ranging voltage input

Comments (0)

Add a Comment

Allowed tags: <b><i><br>Add a new comment: