Victron 75/15 MPPT RFI Problem on HF Receiver

Hello Operators

Last week the Victron 75/15 mppt charge controller was tested for RFI. Unfortunately, the load port dumps an enormous amount of RFI on an HF receiver, while the receiver is powered by the 75/15 load port and charging with solar power. The next clip is a short video published on Instagram and YouTube showing one of the RFI tests.

Toroids arrived 21AUG2022, testing continued.

Testing the effectiveness of an FT240-31 toroid, in removing RFI from the @victron_energy 75/15 load port during solar charging. 

Test: inconclusive

Unfortunately, the clouds have rolled in, so this test will continue when the Sun returns.

Here’s what we’ve learned so far

  • The noise is generated inside the controller.
  • Adding a toroid on the PV input doesn’t help!
  • Noise is introduced to the radio on the power cable.
  • Changing the PV from portable to tower-mounted and grounded doesn’t help.
  • Very little noise via antenna!
  • The noise gets worse on lower bands.
  • Noise increases with greater current.
  • RFI stops when the battery is fully charged.
  • Without more than 7 amps current from the PV, RFI is difficult to detect on 17 meters or above.

Validate my tests

If you’d like to make your own tests with the same or similar Victron model, here are my testing perimeters.

  • The radio is connected to the load port of the Victron.
  • With the solar panel connected, be certain more than 5 amps are coming in from the solar panel
  • With the radio connected to the load port, solar panel connected and charging, test 80m, 60m 40m, 30m, 20m, 17m, & 15 meters for RFI.

Some operators report no RFI when connecting their radios directly to the battery, without using the load port on the Victron. If others can validate, this is a good thing! The only problem is losing the built in logging statistics from the load pott as well as the incoming current from our Solar panels. If we don’t use the load port, we can’t get statistics on the incoming and outgoing energy directly from the Victron.

That’s all I’ve got for now guys. Please comment with your test results in the comments below.

Julian oh8stn
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  1. Hallo Julian,
    I’m using the Victron MPPT 75/15 for many years in my shack to load different batteries. In main lead acid and lead gel batteries. I never have seen any RFI in all bands hf anf uhf. I did not load lifepo4 batteries until now. Therefore my suspect ist that the power management of your lifepo4 battery may be the source of RFI.
    vy 73

    • It’s a great point but I need to update the post. I already tested with a lead acid battery, and still have the same result. I even tested a lithium iron phosphate battery which had no battery management system. Same result.

  2. Hi Julian
    The voltage of the solarpanel should be at least 5 volts higher than
    Youre battery voltage , Maybe thats solves the problem
    I have bought me also a victron solarcharger and read in the
    Manual that it is better to have 2 panels in series ,
    Just a simpel tought from my side

    73 ph7fe harry

  3. Hi Julian
    My experience is that ANY DC/DC converter makes tons of noise with its buck regulator, it is just the matter at what switching frequency is it operating. I suggest L-C filtering at the output. You can buy them on popular sites, search for dc/dc lc filters..

    73 S55ES

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