250A Dual Battery Isolator – 12V/24V Smart Voltage Sensitive Relay (VSR)

Running a dual battery setup in your vehicle?

This smart VSR (voltage sensitive relay) isolator makes it easy.

It's rated at 250 amps, so it can handle serious current.

It works on both 12V and 24V systems, automatically connecting your second battery when the main is charging and disconnecting it when voltage drops—protecting your starter battery from being drained.

Perfect for campers, boats, 4x4s, or any vehicle with auxiliary power needs.

It's a solid-state smart isolator, no moving parts.

Unbranded but built to do the job.

If you're adding a fridge, lights, or inverters, this isolator keeps everything charged and reliable.

Simple, automatic, and heavy-duty.