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Blue Sea Dual Circuit Plus Battery Switch and SI-Series Automatic Charging Relay

The Add-A-Battery includes a Dual Circuit Plus™ Battery Switch and an Automatic Charging Relay. These components simplify switching and automate charging, so that all you have to do is turn the battery switch ON when you arrive and OFF when you leave.

Key Feature Battery Switch

  • Simplifies switching
  • Isolates engine and house circuits
  • Combines batteries for emergency starting
  • Tin-plated copper studs for maximum conductivity and corrosion resistance

Key Feature Automatic Charging Relay

  • Automatically combines batteries during charging
  • Isolates batteries during engine cranking and when not charging
  • Shares the charge between two batteries more efficiently than a battery isolator
  • Allows efficient dual battery charging without needing regulator adjustment or rewiring
  • Amperage: 120A
  • Dimensions : Battery Switch : Height 98mm, Width 98mm. ACR : Height 89mm, Width : 99mm
  • Weight: 2.36lb (1.07kg)

 Whats in the Box

  •  SI-ACR Automatic charging relay – 12/24v DC 120A
  • E- series dual circuit plus Battery switch 

* See attached diagram for typical installation

Click on the below for the following information

Diagnostic flow chart


LED status chart

Selecting fuses and wire size

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