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Not sure which one? Ask us to confirm fitment first →For UK customers, prices include VAT, customs and delivery unless checkout states otherwise. Outside the UK, shipping is shown at checkout and local customs and taxes remain your responsibility.
Some products are made to order, imported or custom built. If timing matters, contact us before ordering and we will confirm the expected delivery timeframe.
Send the vehicle, engine and current setup if you want us to confirm the exact application before checkout.
| Specification | Details |
|---|---|
| Manufacturer | REDARC |
| Manufacturer part number | SBI212 |
| System voltage | 12V |
| Continuous-current rating | 200A |
| Maximum inrush current | 600A |
| Connect threshold | 13.2V; five-second delay |
| Disconnect threshold | 12.6V; ten-second delay |
| Threshold tolerance | ±0.1V |
| Standby current | Less than 5mA |
| Function | Automatic voltage-sensing battery isolator |
| Battery arrangement | Suitable compatible lead-acid batteries; verify alternator operation |
| Isolator dimensions (L x W x H) | 90 x 95 x 100mm |
| Isolator weight | 600g |
| Supplied | SBI212 isolator; installation cables and fuse equipment separate |
The REDARC Smart Start SBI212 automatically connects a suitable auxiliary battery when the starting battery is charging, then separates the batteries as the voltage falls. It is a straightforward way to manage a compatible 12V dual-battery system without remembering to operate a manual switch.
SKU: XEISBI212
The isolator connects at 13.2V after a five-second delay and disconnects at 12.6V after a ten-second delay, with a ±0.1V voltage tolerance. This allows a compatible alternator system to charge the auxiliary battery while reducing the chance of accessory use drawing down the starting battery.
The LED provides an indication of the isolator's state. Its less-than-5mA standby draw keeps the isolator's own demand low when it is not active.
The SBI212 is rated at 200A continuous current, with a 600A maximum inrush rating. That is the isolator's capability, not a guarantee of the current your alternator will put into the battery. Cable size, fuse protection, alternator behaviour and battery requirements still determine the installation.
It is a voltage-sensing isolator, rather than a multi-stage DC-DC charger. Use it with compatible lead-acid battery arrangements and suitable alternator operation. For a regulated charge profile, lithium charging or a smart-alternator application that needs voltage boosting, the REDARC BCDC Core 25A is an alternative for protected in-cabin installation.
This listing is for the SBI212 isolator. Select installation cables, terminals and fuse protection separately to match the required circuit. The 200A model measures 90 x 95 x 100mm and weighs 600g, so leave space for terminals and safe cable routing as well as the isolator body.
Protect the cables from heat, sharp edges and moving components. A correctly planned installation is what makes automatic battery management useful and dependable.
| Specification | Details |
|---|---|
| Manufacturer | REDARC |
| Manufacturer part number | SBI212 |
| System voltage | 12V |
| Continuous-current rating | 200A |
| Maximum inrush current | 600A |
| Connect threshold | 13.2V; five-second delay |
| Disconnect threshold | 12.6V; ten-second delay |
| Threshold tolerance | ±0.1V |
| Standby current | Less than 5mA |
| Function | Automatic voltage-sensing battery isolator |
| Battery arrangement | Suitable compatible lead-acid batteries; verify alternator operation |
| Isolator dimensions (L x W x H) | 90 x 95 x 100mm |
| Isolator weight | 600g |
| Supplied | SBI212 isolator; installation cables and fuse equipment separate |
No. It connects and separates compatible batteries according to voltage. A DC-DC charger also regulates the charging output and provides the selected charging profile.
Choose a suitable lithium-capable DC-DC charger instead, such as the BCDC Core for protected in-cabin installation, and match the charger to the battery's requirements.
Not automatically. The alternator must hold the voltage needed for the isolator and battery arrangement. Use an appropriate DC-DC charger where the vehicle needs regulated auxiliary charging.
No. Select cables, terminals and fuses separately for the SBI212 installation.
Not necessarily. The isolator responds to battery voltage, which can remain above its disconnect level after the engine stops. It disconnects when the stated voltage condition is reached.
For UK customers, prices include VAT, customs and delivery unless checkout states otherwise. For customers outside the UK, local customs and taxes remain your responsibility, and shipping is shown at checkout. If a shipping option is not available, email us and we will prepare a tailored quote.
Many of the products we sell are made to order, imported or custom built, so a lead time may apply. If you need a part urgently, contact us before ordering and we will confirm the expected delivery timeframe and process.
Check dimensions, mounting points, clearance and any wiring or hose requirements against your setup before ordering.
Send us your vehicle, year, current setup and any fitting date, event, trip or deadline before ordering. We will help check fitment, product choice and timing.
