Re: (ET) E 20 - charger hum

[Tim Humphrey <hump evgrin com>]

It is supposed to hum.

The humming is caused by the windings in the transformer "moving" in 
response to the changing magnetic fields caused by the AC current running 
through them.  Basically it becomes a 60 HZ speaker.

The hum will get louder as the batteries get full. It is the loudest if 
you turn on the charger when the disconnect is disconnected. This is kind 
of a nice feature thet reminds us to leave the disconnect, connected for 
charging.

Which kind of makes me wonder why we have a disconnect in the first place. 
I know I've bypassed mine.....(it was broke anyway)



Original Message -----------------------
Could you tell me why my battery charger hums real loud when trying to 
charge my batteries?