This is a video about a Dual Battery Isolator VSR Install.

Support your solar system with the best dual battery isolator.

ZERO VOLTAGE DROP: Forget the traditional diode relays and so-called “solid state” devices that can rob you of almost 2 amps of output voltage! The KeyLine Dual Battery Isolator VSR is the only unit designed with cutting edge programming to deliver optimum performance. Please listen to me and buy from Keyline. Do not buy knock offs of this product.

You connect this to your battery instead of your alternator. Since it is a voltage sensitive relay, it operates when the battery reaches 13.3 volts. It will never drain the battery because it has a cut-off at 12.8 volts. Please watch my video on the install.

as an Amazon Affiliate, I may receive a small percentage at no cost to you. I am a User of this product.

About this item

Forget the traditional diode relays and so-called “solid state” devices that can rob you of almost 2 amps of output power! The Keyline Dual Battery Isolator is the only SMART unit designed with cutting edge programming to deliver optimum performance – with ZERO sacrifice. This compact battery isolator was built ultra-small (2.6″ x 2.6″ x 2″) to fit almost anywhere! A perfect fit under the hood to get close to your dual batteries.
VOLTAGE SENSITIVE RELAY: The KeyLine Automatic 140 Amp Dual Battery Isolator is all you need to charge Two Battery Systems. Voltage Sensitive Relay (VSR) cuts in at 13.3 volts and cuts out at 12.8 volts to ensure your primary battery is always charged and ready to start your vehicle. It’s like having two separate power sources for each battery while only having one alternator!
RUGGED DURABILITY: Unlike other chargers on the market today, the KeyLine Automatic 140 Amp Dual Battery Isolator is IP65 Certified. This International Protection rating means that your KeyLine isolator is safe for use even for your off-road needs in dusty, wet and unexpected extreme weather environments.
WHAT YOU GET: 140 Amp Smart Battery Isolator; 7AWG x 12” Red Cable with two connectors; 3AWG x 12” Black Cable with two connectors; 7AWG x 24” Red Cable (cut to length, with single connector); (1) 5/16” Lug Cable End, (1) 3/8” Lug Cable End; 1-1 ½” Red Shrink Tube. 3-wire install and comes with mounting plate, hardware, heavy gauge ground and power wires (see images for exact contents of kit). Easy-to-follow directions for the novice DIYer. Power wire in, power wire out. What could be easier?
BUY WITH CONFIDENCE: Every 140 Amp Dual Battery Isolator is backed by an industry leading 12-month warranty. If you are not 100% satisfied with your purchase, simply take advantage of the No Questions Asked, 30-Day Money Back Guarantee!!