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Old 06-24-2011, 10:04 AM   #15
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BIRD is a type of isolator relay from Intellitec and Kix explained how it works vs a plain old solenoid.

There is a lot of confusion over what batteries are charged from what source and under what conditions. There is no single answer - some major brands do things one way, while others have a different approach, and there have been changes over the years and for different models as well. Any answers given on this subject have to be qualified by year, make and model of RV.
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Old 06-24-2011, 10:59 AM   #16
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Quote:
Originally Posted by RickO View Post
Can you please explain the difference in the BIRD and isolator solenoids?

Rick
Here's a link to Intellitec's BIRD pdf info file

I also don't understand the difference of how the isolator solenoids work.
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Old 06-24-2011, 11:26 AM   #17
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Thanks Kix and John. That helps a lot.

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Old 06-24-2011, 11:42 AM   #18
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This is how the BIRD operates and was taken from the documentation for the BIRD for diesels:

The Bird constantly senses the voltage on the auxiliary and chassis batteries. If either voltage is above 13.1 volts, which indicates the batteries are being charged, the control closes the isolator relay. This parallels the batteries, charging them both. If the ignition is off and the voltage falls below 12.5 volts for approximately 1 minute, the relay will open to prevent the auxiliary loads from discharging the chassis battery. When the voltage goes back above 13.1 volts, the relay will close again.


If the ignition is on and the voltage falls below 12.0 volts for approximately 1 minute, the relay will open to prevent the auxiliary loads from over-loading the alternator and discharging the chassis battery. When the voltage on the chassis goes back above 13.1 volts, the relay will close again. Allowing the batteries to stay connected together to a lower voltage helps charge a heavily discharged auxiliary battery more quickly with the varying output of the alternator.


A Gen Set lock-out input is provided to isolate the batteries to prevent conflicts if both the converter/gen-set and alternator are trying to charge the batteries at the same time. When this conflict occurs, it can cause the dash alternator indicator light to illuminate in error and may cause 120 volt circuit breakers to trip.


If the Gen Set is running, the chassis battery and coach battery will be isolated. In this case the chassis battery will be charged by the alternator and the coach battery will be charged by the Gen Set. In the event that the chassis engine is not running, the chassis battery is isolated and will not be discharged by auxiliary loads.
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Old 06-24-2011, 04:41 PM   #19
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Quote:
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Here's a link to Intellitec's BIRD pdf info file

I also don't understand the difference of how the isolator solenoids work.
The BIRD is NOT a solenoid (some use the word relay).............it DOES control the isolator solenoid by either energizing it or not dependent on parameters.

And as GaryRVRoamer says........that's the way it works on my coach YMMV
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