Redarc Smart Start Battery Isolator with Wiring Kit - 12 Volt - 100 Amp
(22 reviews)
Price: $269.00
In Stock
Redarc Smart Start Battery Isolator with Wiring Kit - 12 Volt - 100 Amp
Item # 331-SBI12KIT
Retail:$298.00
Our Price: $269.00
You Save: $29.00
In Stock
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- Reviews (22)
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Redarc Battery Charger - 331-SBI12KIT
- 12V
- Battery Isolators
- Redarc
- Vehicle Battery to Auxiliary Battery
This 100-amp dual-battery isolator pulls power from your start battery to charge your auxiliary battery. Isolator switches off to prevent dead battery if start battery voltage drops too low. Compact design for versatile mounting. Wiring included.
Features:
- Battery isolator protects start battery from auxiliary drain in multiple battery setups
- Transfers charge from start battery to auxiliary battery once start battery gains charge from alternator
- Stops charge transfer if start battery voltage drops too low, preventing excessive discharge
- Override wire allows for emergency starts and simple fault detection
- Attach to a switch (sold separately) to manually reverse charge and jump-start a dead start battery
- Connect to an LED (not included) that can be mounted in your cab for easy viewing of diagnostics
- Silver contact points ensure long life and corrosion resistance
- Compact design allows for versatile installation
- Mount the isolator in a convenient location near the start battery
- Plug-and-play wiring kit includes:
- (2) 7-3/4" Long and (2) 70" long positive battery cables
- 29-1/2" Long ground wire
- (2) 60-Amp fuses
- (2) Fuse holders with mounting nuts
- (2) Battery terminals with protectors
- Made in Australia
Specs:
- Application: vehicles with standard or temperature-compensating alternators
- Maximum continuous current: 100 amps
- Standby current: less than 5 mA
- Output connection: 12V DC
- Overall dimensions: 3-1/8" long x 2-15/16" wide x 2-1/2" tall
- Wire gauge: 6
- 2-Year warranty
With this dual-battery isolator, you can transfer power from your start battery to an auxiliary battery without draining your start battery. As long as your vehicle is on and the alternator is supplying power to the start battery, the Smart Start will transfer some of that power to your auxiliary battery. When your vehicle is shut off, the isolator will separate its connection and stop pulling power. This ensures that your start battery is protected so that no matter how weak your auxiliary battery becomes, your start battery won't be left flat. As a result, you can venture out without the fear of running into a dead battery.
Parallel Charging for Optimal Functioning
The Smart Start connects in-line between your start battery and the auxiliary battery. This way it can pull the charge directly from the battery instead of pulling from an outside source, like your vehicle's alternator. This method of charging is called parallel charging.
Most other battery isolators on the market use priority charging. In a typical priority charging setup, the alternator provides charge to either the start battery or the auxiliary battery, but not to both simultaneously. This can leave both batteries underpowered. With parallel charging, the power is drawn directly from the start battery, which removes stress on the alternator because it doesn't have to manage both batteries separately. This streamline connection of the Smart Start to the start battery also prevents potentially damaging voltage surges that can occur when a priority charger switches over between batteries.
Additional Features
The blue override wire attached to the Smart Start allows for additional features, like the Start Assist function. This function allows you to jump-start a dead start battery using the auxiliary battery. Just connect the blue wire to a push-button switch (sold separately) to create a bridge of power from the auxiliary battery to your dead battery. Great for those mornings when you leave the radio on too long or forget to close the vehicle door.
You can also connect the blue wire to an LED (not included) to create an in-cab fault indicator. There is an internal LED on the unit itself that provides fault detection. This system communicates by causing the LED to flash a certain number of times to indicate errors. For example, 2 flashes signals over-voltage, and 3 flashes signals a voltage drop or excessive current draw fault. By connecting an additional LED to the blue wire, and running that up to your cab, you can more quickly assess these faults than if you had to peer into your engine compartment to see the light on the unit itself.
For assistance in wiring the Smart Start to include these optional features, please refer to the diagrams below:
Compact Design for Versatile Mounting
Mount the battery isolator in a location near your vehicle's start battery. The compact design of the unit allows you to have a good deal of flexibility when selecting a mounting location. A couple of places to consider would be in front of the radiator or behind the headlight assembly. You will need to make sure that the location you choose is not exposed directly to engine heat.
Place the included fuses into the fuse holders and secure one end of each positive (red) cable to the studs on the holders. Then connect the cables to the positive terminals on the start and auxiliary batteries. Securely mount the Smart Start unit and use the free ends on the positive cables to attach each battery to one of the terminals on the Smart Start. Properly connect the ground wire, and ensure that all connections are tight.
For assistance in properly wiring the Smart Start, please refer to the diagram below:
SBI12KIT REDARC Smart Start Battery Isolator w/ Wiring Kit - 12 Volt - 100 Amp
Installation Details
California residents: click here
Customer Satisfaction Score:
98% were satisfied with this product
2% of customers were not satisfied
- Arrived Damaged
Customer Reviews
Redarc Smart Start Battery Isolator with Wiring Kit - 12 Volt - 100 Amp - 331-SBI12KIT
Average Customer Rating: 5.0 out of 5 stars (22 Customer Reviews)
This 100-amp dual-battery isolator pulls power from your start battery to charge your auxiliary battery. Isolator switches off to prevent dead battery if start battery voltage drops too low. Compact design for versatile mounting. Wiring included.by: Jason03/28/2022
I use this in my Jeep to keep my second battery for accessories charged and ready. After a year of having it installed I couldn’t be happier with the product. I have spoken with the folks out in Australia at Redarc and find them to be very awesome to speak too.
by: Douglass06/22/2020
Wonderful instructions, plenty of wire, and a very good product. Will try and update this review in a year! Thanks for putting the pieces together. All solid quality, 60 amp fuses, and neatly trimmed heavy gauged wire.
by: Philip 08/28/2020
It's for my 04 Jeep Wrangler TJ.
by: Gregory 02/11/2024
by: John 05/01/2020
Awesome product, easy to install and come with all parts needed to install second battery!!!
by: John 09/11/2023
I didn’t know this product existed. I don’t know why RV manufactures don’t install these when they build the motor homes. Always a pleasure doing business with e-trailer.
by: Bksldr708/27/2022
Really like this isolator. Replaced two Cole-Hersey Isolators that failed prematurely in a Class C RV after only 11 and 3 months. Second photo shows Cole-Hersey replaced by Redarc shown in last picture
by: Nathan B12/28/2019
I purchased the Redarc 331-SB1212D battery charger during the 2018 Christmas holiday season, it shipped with good efforts from etrailer. It is installed on a 2009 Chevy 5500 diesel powered cab and chassis truck , 2 on-board factory batteries in combination with add on 2 battery auxiliary bank, chassis mounted. I have extra heavy auxiliary power leads wire loom insulated routed with 350 amp Anderson connectors located at the ends , 1 lead to the front bumper , 2 leads to the rear bumper and a small 2/0 lead routed to the cab with 175amp Anderson connector for a 650 watt inverter. This application provides jumpstart service and remote power for dump trailer and 3000watt inverter power . This system has an additional provision to combine all batteries for heavy winching or sub zeros self jumpstart . My installer provided the additional switching to Redarc design specification.
by: Tommy R.09/01/2020
I put this on a 2013 chevy HD 4 wheel drive and it works very well.
I have my main battery went bad and I open the hood and flip the switch and the
accessory battery started my truck. thank you for having good products for us to buy
when we need something,
by: Randall D06/10/2020
With a flip of a switch from the drivers set, I'm able to re-charge the coach batteries from the vehicle battery via this Redarc Battery Charger while driving to the next camping adventure.
by: John12/17/2017
This bad boy had me at dual sensing, and 200 amps is exactly what I need for my beefy house battery bank. One knock might be a short ground wire, but otherwise great product.
by: Terry04/11/2022
This is a great product. I use it to run my fridge in my Jeep to keep the second battery charged.
by: David05/23/2022
I have used these redarcs a couple of times with great success but having this shipped in a very timely fashion from etrailer is fantastic!
by: David08/13/2019
works great would but anain
by: David 09/14/2022
works prefect
by: Larry H07/17/2019
Product works as expected and I would recommend it to anybody needing a product like this.
by: Snowslide07/22/2022
Got exactly what I needed and very fast.
by: Colin 07/07/2021
Works great
by: Darrell 10/05/2022
by: Don 03/01/2021
Great product, great service.
by: Daniel06/06/2022
by: Joseph 08/22/2021
22
22
See what our Experts say about this Redarc Battery Charger
- How To Charge On-Board Auxiliary Battery from Start Battery on VehicleIf you're looking to change an on-board auxiliary battery from the main battery then I recommend using the Redarc Smart Start Battery Isolator with Wiring Kit part # 331-SBI12KIT. This kit has everything you need to hook up the auxiliary to the start battery and it has built-in features to prevent the auxiliary battery from draining the start battery.
view full answer... - Can You Install an Auxiliary Battery in a Truck Bed and Use for PowerThe only issue you'll run into installing an auxiliary battery in the truck bed would be keeping it charged. In order to do this you'll need to pull said charge from the vehicle's start battery unless you want to remove the battery and plug it in somewhere with a wall outlet each time. There also needs to be some sort of smart device in-between so you can be sure it doesn't pull too much juice from the vehicle's main battery. For this, I recommend the Redarc Smart Start Battery Isolator...
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view full answer... - How to Wire Two 6 Volt Batteries to a 12 Volt BatteryI attached a picture that shows how to run batteries in both series and parallel. You will need to wire up the two 6 volt batteries like the picture on the left so that they would be in series and at 12 volts. To connect a 12 volt battery to that circuit you would need to run the positive post of the 12 volt battery to the positive side of the battery run on the in series batteries. Not the one that is connecting the two batteries, the one that would be the output of the two in-series...
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view full answer... - Does The Manager30 Replace Solar Panel ControllerYes, the The Manager30 Battery Management System with Lithium Profile # RED88FR takes place of the solar controller for your current solar panel system. Solar panel controllers are used to help manage the power coming in from the panels and since The Manager30 does the same thing it actually can't be installed with a solar panel controller. The Manager30 is definitely an upgrade though as it pulls power from the solar panels and your vehicle start batter (via the alternator). It prioritizes...
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Do you have a question about this Battery Charger?
Info for this part was:
Edited by:
Lindsey S
Installed by:
Jeff D
Expert Research:
Jameson C
Video Edited:
Chris R
Written by:
Brian T
Updated by:
Kristina F
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