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Manual Battery Switches Automatic Charging Relays Add-A-Battery Kits

Add-A-Battery Kit - 120A [Boxed]

Don’t get stranded  – Add a Battery!  

Adding a second battery to the electrical system prevents the unintended discharge of the engine start battery.


Blue Sea Systems popular Add-A-Battery kit was primarily designed for boats with alternator output of 120A or less.


When installed, the Add-A-Battery isolates the start battery from the house loads which prevents the discharge of the start battery. The Add-A-Battery offers a simple way to control the charging and battery switching of two battery banks. The E-Series Dual Circuit Plus™ Battery Switch simplifies the switching while the SI-ACR automates charging between two batteries.

MSRP: $187.99
Where to Buy Find a TECH Installer Compare
Weight2.36lb (1.07 kg)
1 5511e e-Series Dual Circuit Plus™ Battery Switch
1 7610 SI-ACR Automatic Charging Relay - 12/24V DC 120A
Meets the following Regulatory Specifications
CE Marked
ISO 8846
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