Connecting solar controller to inverter or converter feeds

MrWizard wrote:
Connect it to the wires for the inverter
The inverter is never going to draw more than what it always use,s
If part of that power amps is from the solar , that just less from the batteries, very unlikely to do an over load on the inverter circuit

If the PCM controller is basically putting out a square wave as it pulses is there a chance it would cause noise on the inverter input? If they were on separate battery feeds would the battery help 'filter' the pulses?
... or am I thinking too much again? :D