I am running two Multiplus II 2x120 24 vdc inverters in a parallel configuration with a Cerbo GX in a Class A motorcoach. For incoming AC power I have two options: Option 1 is a connection to external AC power. This power could be from a split phase source such as an RV 50-amp pedestal, or could be from a single phase source such as the 30-amp pedestal or a 110 VAC, 15-amp outlet from a house.
Option 2 is a connection to our on-board 8-kw generator. This generator supplies single phase power.
When I hookup to external power or run my generator, I have to manually adjust the incoming power limit to match my power source. This requires going to the Menu portion of the Touch-50, selecting the Multiplus II 2x120, finding the Input Current Limit page, and using the plus = or minus - buttons to scroll to the current limit needed. The scrolling function can easily lead to a mistake, and the exact level chosen needed must be known. This maybe fine for the technically oriented person, but is not so easy for a normal, common user.
I have two suggestions. Suggestion #1 is to create an interface panel similar to the automatic generator control panel on the Touch-50. I would suggest that this panel might have say five push buttons which could be individually programed to specific 'incoming current limit'. For example, button 'A' might be 50-amp, button 'B' 30-amp, button 'C' 20-amp, and so on. The label of each button should be programmable i.e. button 'A' might show '50-amp'. When you hook up to shore power, you would call up this screen and select the correct current limit by pushing the button.
Suggestion #2 is to allow an externally programmed condition to select one of the buttons automatically to override the previously selected condition while the external condition exists. As an example, assume that button 'E' is the button chosen for the override condition and that it is set to 70 amps which matches the generator output current limit. Also assume that button "C" is currently selected for an input current limit of 20-amps. The external signal selected is a "Generator Running' signal.
When the generator IS Not Running, the current input limit is set to 20-amps as selected by button 'C'. When the generator is started, either manually or automatically by the AGS control, the external signal "Generator Running' is turned ON and the input current limit set by button 'E' 70-amps is selected. When the generator reaches its turn-off conditions and turns off, the external signal "Generator Running" turns off and the input current limit reverts to the originally selected button 'C' 20-amps is selected.
As a final benefit, having the input currents selected by a Touch-50 virtual push button allows a non-technical person to adjust the incoming power in a simple manner and placing the choice of input power levels deeper in the system where technicians set the levels.
