[Elecraft] Solar Controller Question

[Ed Gray W0SD]

I have a MPPT controller and they produce a lot of radio interference.  
 From what I understand PWM also cause radio interference.  I believe 
that the older "diversion" controllers are quiet.  Normally they would 
waste a lot of energy but if one were running enough equipment so the 
battery was being drained faster than it was being charged I assume 
there would not be much energy waste.

My question is those of you who operate with a fairly good size panel 
and need a solar controller what do you use that produces no radio 
interference.  I am looking at what would be set up for a RV or a good 
sized boat or a day or two portable operation for something like the US 
Island QSO party coming up.  We would want to run 100 watts with the K3.

This would be a 12 vdc system with something in the range of 100-140 
watt panel.  Probably two 6 vdc deep cycle batteries.

Ed W0SD