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West Mountain Radio ISOpwr+ (Plus) Auxiliary Battery Isolator

JeffDS3

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I drive a 2011 Ford Fiesta with a battery that’s just big enough. The problem is when I have my gear on and start the car, the voltage drop causes the radios/scanners to restart. Would this device help prevent that? For the battery I was just going to use some small 12v battery. It just needs to power everything until the engine starts.

 

Mr_Boh

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Yes. That's not priced terribly, but there are plenty of solutions for auxiliary battery isolation ranging in price, typically tied with battery capacity and features. You can also roll your own solution with relay/solenoid that only allows power to the auxiliary battery while the ignition is on so that if you for some reason have devices attached to the battery that are not controlled by ignition, it won't kill your primary.

That just costs more because it's an off the shelf solution with fuses and a little more "intelligence" in the circuitry.
 

JeffDS3

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Yes. That's not priced terribly, but there are plenty of solutions for auxiliary battery isolation ranging in price, typically tied with battery capacity and features. You can also roll your own solution with relay/solenoid that only allows power to the auxiliary battery while the ignition is on so that if you for some reason have devices attached to the battery that are not controlled by ignition, it won't kill your primary.

That just costs more because it's an off the shelf solution with fuses and a little more "intelligence" in the circuitry.
Thanks. I’m not the most electrically inclined plus space is premium in the car so the more compact everything is, the better. This and the battery will be wedged under the passenger seat.
 

Mr_Boh

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Yeah, so you will be trading the higher cost for the features. I mean just over $100 MSRP isn't hateful for something that lets you go in with a computer and program exactly what is considered "low voltage" and other thresholds for the power transfer.
 

JeffDS3

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The linked product does not state that it will protect against engine start issues. It might be too slow to respond.

This one will do what you want;
nah, because everything is on the auxiliary battery until the main electrical system hits the threshold then the unit ties everything together. When you kill the engine, the unit cuts everything to the auxiliary battery.
 

mmckenna

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It just needs to power everything until the engine starts.
This will do what you want:


A little more pricy than some of the other options, but it's got everything you need, including the battery. Amazon doesn't have the best price, you can shop around and find it cheaper probably.
 
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JeffDS3

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This will do what you want:


A little more pricy that some of the other options, but it's got everything you need, including the battery. Amazon doesn't have the best price, you can shop around and find it cheaper probably.
perhaps but that’s too large for my car. Idk if you’re familiar with fiestas but they are very small cars. I have at best 3-4 inches of verticals space under the seats and and 10x10 in horizontal space. Plus the battery in the car is sized just enough to start the car. If you leave anything on for more than 20 minutes, it can discharge enough that it won’t fully crank later to start it so with the original thing I posted, I can take use the scanners/radios without touching the car battery.
 
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