What is a VSR Voltage Sensitive Relay and How to install VSR? VSR for Dual battery system explained

VSR (Voltage Sensitive Relay), ACR (Automatic Charging Relay) or smart battery isolator are automatically controlled relay switches that allow two batteries to be combined when charging, and to be isolated when not charging and current is draining from one of the batteries. This way you can automatically preserve a fully charged battery at all time, especially the start battery for starting the engine. In the video is a typically wiring diagram from a VSR in a two Battery system (Start and House batteries).
Normally the VSR senses voltage from the ENG (engine) port to decide whether it should close (make) or open (break) the connection, so if the Engine is ON the sensing voltage would be high and VSR will turn ON and make the connection - allowing BOTH Start and House batteries being charged. And when the Engine is OFF the voltage will drop and VSR will turn OFF by cutting the connection and this way the loads would draw powers from ONLY the house battery - preserving the full power capacity in the Start Battery.
There are also more advanced features for the VSR like manual override, 0 power storage mode, external indication LED port, Dual port sensing or 12/24V input voltage support…etc. Please check our product introduction page for more information.
YIS Marine VSR products
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[@MattHo3]

Nice and clear demo!

[@chencecily3055]

Thanks for clear explanation.👍

[@YISMarine]

Hello! Thanks for your support 🥰

[@JoeMac1983]

Thank you.

[@YISMarine]

Hello! You are welcome😁

[@BeatsByBlas]

For some reason my VSR stays on even when disconnected from the start battery and only plugged into the house battery

[@gaiagaiagaiagaiagaia]

check the "cut in" and "cut out" voltage on the VSR, and then use a multimeter to record the voltage of you car battery when turned on and off. There is a chance that your VSR is faulty, or is the wrong model for your system. If the voltage of your batteries when reting is higher than the cut in voltage on your VSR that would explain your issue.
Also check that you wired your system correctly according to the manufacturers specifications with the correct gauge wires.

[@terrancegill7507]

Where can I buy these in North America?

[@YISMarine]

Hello, you can send us an email at [e-mail] or reach out to us on Facebook.
We look forward to serve you!
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