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  #11  
Old 09-24-2022, 09:24 AM
rocketman1988 rocketman1988 is offline
 
Join Date: Jun 2010
Location: Sunman, IN
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The battery can ACCEPT 80A for charge; you can use anything smaller, ie 70A, to charge it. The reason it is popping the breaker is because the battery can ACCEPT 80A and 70A is available but it is protected for 60A...so the alternator is putting all 70A into a 60A circuit breaker. What happens? It works as it is supposed to and trips the breaker.
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  #12  
Old 09-24-2022, 09:42 AM
Mich48041 Mich48041 is offline
 
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The ETX900 does NOT require 80amps to charge. It will accept up to 80 amps without being damaged.
A smaller battery will still accept the full alternator output, but the battery will be damaged.
The circuit breaker is too small.
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  #13  
Old 09-24-2022, 10:20 AM
Bavafa Bavafa is offline
 
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Location: Sacramento, CA
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Quote:
Originally Posted by Clipper1 View Post
I have a 70A plane power alternator. Breaker is 60A.
I am wondering why you went with the 60A breaker for a 70A alternator. I have been told, to up size the breaker by around 5A from Alternator, in your case it would be a 75A breaker.
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  #14  
Old 09-24-2022, 10:53 AM
Clipper1 Clipper1 is offline
 
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Thank you Gentlemen. Your advice is very helpful. I think the underlying problem is that the builder initially used a PC680 battery and then he changed it out for the EarthX without doing any swap out on the breaker.
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  #15  
Old 09-24-2022, 10:57 AM
Mich48041 Mich48041 is offline
 
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Instead of installing a larger circuit breaker, eliminate it altogether. Install a fusible link in series with the alternator "B" lead to protect the battery and aircraft electrical system from a shorted alternator or shorted "B" lead.
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  #16  
Old 09-24-2022, 12:50 PM
Bicyclops Bicyclops is offline
 
Join Date: Oct 2012
Location: LA, California
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Quote:
Originally Posted by Mich48041 View Post
Instead of installing a larger circuit breaker, eliminate it altogether. Install a fusible link in series with the alternator "B" lead to protect the battery and aircraft electrical system from a shorted alternator or shorted "B" lead.
Or use an ANL. We're not protecting the battery, we're protecting the B-lead and alternator from the battery which will try and melt anything that's shorted.

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