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Ed_Gee's avatar
Ed_Gee
Explorer II
May 25, 2016

Low RFI Solar Charge Controller for hams

If you are an amateur radio operator and have a solar charging system on your RV, you may be experiencing RFI ( radio frequency interference ) to your ham radio receiver from your solar charge controller. These devices are often poorly engineered and poorly designed for RFI suppression, if at all. Having experienced severe RFI to my ham operations from a Chinese built charge controller (Renogy) I went on the Internet in search of something that would work better for me. I finally found the product I needed at: http://www.DIYSolarforU.com . The Apollo model charge controller is designed by a ham - electrical engineer who could not find a low RFI Solar Charge Controller on the market that would meet his needs. I have purchased two of these units and upon replacing my old charge controller the change was like going from night to day. I now have zero noise being emitted by this new device. The company owner is extremely responsive to customer questions, too. The Unit is an MPPT high efficiency controller that can handle up to 230 Watts and 50 volts max. I use mine with 200W of solar panels, but you can easily parallel these controllers if you run more panels. The Price for one is only $79.00 US . I highly recommend these chargers if you wish to curtail RFI coming from your current solar charge controller. The Apollo Unit comes a a bare PC board so you would have to provide your own housing..... Not generally a problem at this price.
  • SCVJeff wrote:
    Ed_Gee wrote:
    SCVJeff wrote:
    Curious where were you hearing the RFI at?


    Everywhere, from 80M on up .... and clear through VHF. Many ferrite filter beads on the input and output lines of the old controller did nothing to help.... the controller box itself was radiating.
    OK.. I've seen it on an analyzer but didn't look below 100MHz, there was too much going on in the upper bands. Ferrite and a few caps are wonderful things to medicate this.


    In the case of the 20A Renogy MPPT charge controller we had, installation of a large number of ferrites on both input and output leads did nothing to attenuate the noise.... to the best of our knowledge it was radiating directly from the board.
  • Ed_Gee wrote:
    SCVJeff wrote:
    Curious where were you hearing the RFI at?


    Everywhere, from 80M on up .... and clear through VHF. Many ferrite filter beads on the input and output lines of the old controller did nothing to help.... the controller box itself was radiating.
    OK.. I've seen it on an analyzer but didn't look below 100MHz, there was too much going on in the upper bands. Ferrite and a few caps are wonderful things to medicate this.
  • same with the controllers for color changing LED awning lights. lots of noise.
    use the white only LED's.. no noise, as no controller is needed.

    N8BSJ.
  • SCVJeff wrote:
    Curious where were you hearing the RFI at?


    Everywhere, from 80M on up .... and clear through VHF. Many ferrite filter beads on the input and output lines of the old controller did nothing to help.... the controller box itself was radiating.
  • SCVJeff wrote:
    Curious where were you hearing the RFI at?


    How about 40 through 10 meters. Probably because I don't use 80.