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Old 07-08-2012, 03:19 PM   #1
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Bird Unit

Mine makes a really loud hum. I was puzzled and concerned that every time I put the batteries on line this loud hum started that I started turning things off until I found it. I don't seen any documentation online about it so I don't really know what it does, or why it makes such a loud hum.

I'm concerned that it may be failing - electronic parts usually go about their business nice and quietly.
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Old 07-08-2012, 06:49 PM   #2
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Is it the BIRD module buzzing?....or your Inverter/Charger (back near or "in" the battery bay).
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Old 07-09-2012, 06:46 AM   #3
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Or is it the Big Boy solenoid humming?
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Old 07-09-2012, 08:59 AM   #4
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Hey Mike, good to hear from you again. Since the Bird unit and the Big Boy are inches apart it is really hard to tell which it is. Rob, I'm pretty sure it is not the inverter as mine is about 8 feet away.

What I do know is that my Big Boys doesn't seem to be working. If I leave the chassis batteries connected with the genset on or on shore power, the draws on the chassis will drain the chassis batteries, and the last time that happened I had plenty of juice in the coach batteries and the Big Boy wouldn't pass the power across to the chassis and I had to get a jump.

What I was planning to do was pull it yesterday but found I was missing something I needed, but while I was back there I sequentially opened the breakers until the hum stopped, and it was the Bird Unit circuit breaker. Each time I closed the breaker I did hear a fairly loud "clunk" just before the hum started again.

What exactly does the Bird Unit do? Also, is the Big Boy something that can be serviced or is it a throw away and replace part? I see they are fairly expensive.
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Old 07-09-2012, 10:58 AM   #5
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I'll have to bow out. No experience with your rig. But like "Frasier Crane" would say on his sitcom: "I'm listening".
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Old 07-09-2012, 12:10 PM   #6
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Intellitec's BIRD is a Bi-Directional Isolator Relay Delay
Bi-Directional Isolator Relay

Charging batteries in an RV application.
When the coach is being driven, batteries will be charged from the engine's
alternator.
When the coach is plugged into shore power,batteries will be charged from the
converter or inverter/charger.
If neither battery is being charged, the batteries are fully isolated.
The controller also senses heavy load so neither battery to prevent the wrong battery from being inadvertently discharged.
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Old 07-09-2012, 01:07 PM   #7
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The BIRD Controller switches charging voltage from the house to the chassis batteries via the "Big Boy" solenoid/relay. The priority is the house batteries which have to get charged to 13.2 volts before the controller will actvate the Big Boy and then charge up the chassis batteries. If you have a bad house battery(s) that prevent the voltage from getting to 13.2 volts then the chassis batteries will never be charged. I have sent a full set of BIRD documents to paul and have spoken to him on the phone and he is going to do some testing and get back to me.
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Old 07-09-2012, 02:16 PM   #8
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Quote:
Originally Posted by Mike Canter View Post
The BIRD Controller switches charging voltage from the house to the chassis batteries via the "Big Boy" solenoid/relay. The priority is the house batteries which have to get charged to 13.2 volts before the controller will actvate the Big Boy and then charge up the chassis batteries. If you have a bad house battery(s) that prevent the voltage from getting to 13.2 volts then the chassis batteries will never be charged. I have sent a full set of BIRD documents to paul and have spoken to him on the phone and he is going to do some testing and get back to me.
Mike, you are the best. I don't get over to the east side of the continent with my MH (I do get to NY on business pretty often), or I'd make plans to meet you in person.
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Old 07-09-2012, 07:27 PM   #9
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Clarification please...
Is "Big Boy" a true brand/manufacturer (or model) name?...for the battery isolation solenoid?
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Old 07-09-2012, 08:57 PM   #10
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Yes it is actually called a Big Boy. Yes it is a brand name. It is a 200 amp continuous duty solenoid and I have been told it can handle 1000 amps for short periods. Not sure it is called a battery isolation solenoid but it does do that. It is really a charge 'selection solenoid but is also the battery boost solenoid. It is physically big and costs $280.
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Old 07-10-2012, 08:02 AM   #11
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Mike,

According to the specs you sent me a Big Boy can handle 1,200 amps for 30 seconds.

Both the BIRD unit and the Big Boy solenoid are Intellitec brands. When I first Googled different variations of "Bird Unit" I got a lot of unrelated results. It was only when I got the documents from you it became clear what it was.

Paul.
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Old 07-10-2012, 08:23 AM   #12
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I replaced my relay recently, the cost for the new relay was $55 delivered, this is the new improved version with silver contacts, all the info to get a new one and how the system works is in this thread, if you find my post.
Continuous duty isolator?

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Old 07-10-2012, 01:05 PM   #13
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Dennis, I don't think you bought a Intellitec 200 amp Big Boy for $55. What you bought was a battery isolation solenoid which is very different. On EBay the Big Boy is $284. Google Intellitec 200 amp Big Boy.
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Old 07-10-2012, 07:48 PM   #14
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Dennis,

I think that is the price of a B.I.R.D. unit, not the Big Boy. Mike is right that the Big Boy is close to $300, but the B.I.R.D. is under $60.

I'm going to the coach tomorrow to check to see which part has failed, or if both are for the trash bin. Hope it is the B.I.R.D.
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