That was one of my main concerns also since I do shortwave monitoring from 160-10 meters. The good news is that I have not detected any noise from the small inexpensive Morningstar Sunguard or Sunsaver pwm charge controllers - and that is with portable antennas only a few feet away from the CC. Once I spun across the bands with the morningstars, the old on/off shunt cc's went into the trash. (saved for recycling anyway)
I was hesitant at first since one of my radio emergency power books mentions an option on one of the morningstar controllers has a jumper to turn it into a plain old on/off controller should TELCO users observe any noise. This kind of cast a question about pwm, and left this reader thinking that only old-style on/off shunt controllers are the way to go when dealing with HF monitoring. But I figured that this is just a duty-cycle on/off switch operating much faster and more efficiently than the old on/off shunt type, and not doing any sort of mppt conversion. Perhaps the author hasn't tried one first-hand.
Once operating from my much larger antennas, new noises would crop up from time to time, and I was certain it was due to the new CC's, only to disconnect them and find the new noises are NOT coming from the morningstar themselves, leaving me on a rfi hunt external to the solar setup.
Result - I am running a MUCH better charge controller with the morningstars, with no noise that I can detect on my Icom receiver without using any sort of ferrites or filtering. I have no first-hand experience beyond the low-current sunguards or sunsavers, so can only speak for those that I do have.
I was hesitant at first since one of my radio emergency power books mentions an option on one of the morningstar controllers has a jumper to turn it into a plain old on/off controller should TELCO users observe any noise. This kind of cast a question about pwm, and left this reader thinking that only old-style on/off shunt controllers are the way to go when dealing with HF monitoring. But I figured that this is just a duty-cycle on/off switch operating much faster and more efficiently than the old on/off shunt type, and not doing any sort of mppt conversion. Perhaps the author hasn't tried one first-hand.
Once operating from my much larger antennas, new noises would crop up from time to time, and I was certain it was due to the new CC's, only to disconnect them and find the new noises are NOT coming from the morningstar themselves, leaving me on a rfi hunt external to the solar setup.
Result - I am running a MUCH better charge controller with the morningstars, with no noise that I can detect on my Icom receiver without using any sort of ferrites or filtering. I have no first-hand experience beyond the low-current sunguards or sunsavers, so can only speak for those that I do have.
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