STB
Guru
Hi all,
My boat has a 30A Blue Sea Systems 8100 ELCI main breaker that is about 1 year old.
As I was walking by it last night, I heard a loud humming coming from the electrical panel. I went in to take a look and listen it was clearly the ELCI.
There was no smoke, smell, or noticeable heat. Holding the wires attached to it in various positions didn't make a difference. The shore power monitor read about 110V and 60Hz with a 20-something amp load on 30A service.
I shut off one of my HVAC units, a 5 year old marine 9000 btu reverse-cycle heat pump, and the humming went away. I turned the HVAC unit back on, and the humming stayed gone. It has stayed gone since.
I'm at a loss as to what could have caused the humming. I'm used to that coming from really old transformers when the core starts to age. I'm having a hard time understanding how a relatively new coil in an ELCI could do that, if that was what was happening. I guess some weird harmonic, maybe.
I called Blue Sea and they were amazing. The customer service rep couldn't explain it, but pinged engineering who asked that they replace my unit for free under warranty. They asked for an address to send me a new one.
I guess I am inclined to let Blue Sea Systems replace it. That was a very kind offer. But, I'm not yet convinced that there is anything wrong with it vs maybe some weird harmonic or something having gotten started and been interrupted by shutting down the HVAC.
Has anyone heard of this before? Any ideas what might cause it?
My boat has a 30A Blue Sea Systems 8100 ELCI main breaker that is about 1 year old.
As I was walking by it last night, I heard a loud humming coming from the electrical panel. I went in to take a look and listen it was clearly the ELCI.
There was no smoke, smell, or noticeable heat. Holding the wires attached to it in various positions didn't make a difference. The shore power monitor read about 110V and 60Hz with a 20-something amp load on 30A service.
I shut off one of my HVAC units, a 5 year old marine 9000 btu reverse-cycle heat pump, and the humming went away. I turned the HVAC unit back on, and the humming stayed gone. It has stayed gone since.
I'm at a loss as to what could have caused the humming. I'm used to that coming from really old transformers when the core starts to age. I'm having a hard time understanding how a relatively new coil in an ELCI could do that, if that was what was happening. I guess some weird harmonic, maybe.
I called Blue Sea and they were amazing. The customer service rep couldn't explain it, but pinged engineering who asked that they replace my unit for free under warranty. They asked for an address to send me a new one.
I guess I am inclined to let Blue Sea Systems replace it. That was a very kind offer. But, I'm not yet convinced that there is anything wrong with it vs maybe some weird harmonic or something having gotten started and been interrupted by shutting down the HVAC.
Has anyone heard of this before? Any ideas what might cause it?