ems
I have a 2004 Winnabago Brave the rear a/c works, but the Display on the EMS monitor show zero current. Is this the way it works or is this a problem, what could cause this? it is a 30 amp and i am ru...
Forum Discussion
The EMS is only active when on a 20 or 30 amp site,, If you are on a 50 amp site it goes to sleep cause it's not needed and the display will show zero amps.
Why is this.
Well you have two HOTS and a neutral. on a 50 amp site current can flow from L-1 to L-2 and bypass the neutral completely (Assumes a perfectly balanced panel) I can if you wish explain why this is a good thing.
So to properly measure current you would need 3 current sensors or at least two, and a comnputer to add 'em up.
But on 30 both L-1 and L-2 are the same, they are connected together. so ALL current flows through the NEUTRAL wire... So you need only one sensor, on the neutral.
Thus they do it that way. Far simpler, far less expensive, and just shut it off when you are on 50 amnps cause the reading would be ... Confusing.
Why is this.
Well you have two HOTS and a neutral. on a 50 amp site current can flow from L-1 to L-2 and bypass the neutral completely (Assumes a perfectly balanced panel) I can if you wish explain why this is a good thing.
So to properly measure current you would need 3 current sensors or at least two, and a comnputer to add 'em up.
But on 30 both L-1 and L-2 are the same, they are connected together. so ALL current flows through the NEUTRAL wire... So you need only one sensor, on the neutral.
Thus they do it that way. Far simpler, far less expensive, and just shut it off when you are on 50 amnps cause the reading would be ... Confusing.
