RFI from Blue Sky MPPT controller. Choke or ?
Hi to the ham radio and other rfi tech types: My mppt controller is creating a lot of rfi. Very noisy on AM broadcast band and all the HF bands through 10 meters on SSB or CW The noise increases...
Forum Discussion
Just some thoughts that might be of help
I have a MS PWM controller in an out building that emits excessive RFI (kills all AM radio reception in the area) only when the battery is fully charged with no noise until it's becomes fully charged. Morningstar knew about the RFI issue and raised the PWM switching speeds on their newer models from about 300Hz to over 100 KHz. If you find the RFI appears only when the battery is fully charged might want to try disconnecting the array at that time - if noise is gone then indeed the PWM charging section of your MPPT controller is causing the radiation issue.
As for eliminating or reducing the radiation I tried lots of things including caps inductors and shielding around the controller none really did a great job. Added a switch to open the array when the noise appears it totally eliminated all the RFI as expected only real problem I have now is to try and remember to turn it back on when leaving the wood shed.
I have a MS PWM controller in an out building that emits excessive RFI (kills all AM radio reception in the area) only when the battery is fully charged with no noise until it's becomes fully charged. Morningstar knew about the RFI issue and raised the PWM switching speeds on their newer models from about 300Hz to over 100 KHz. If you find the RFI appears only when the battery is fully charged might want to try disconnecting the array at that time - if noise is gone then indeed the PWM charging section of your MPPT controller is causing the radiation issue.
As for eliminating or reducing the radiation I tried lots of things including caps inductors and shielding around the controller none really did a great job. Added a switch to open the array when the noise appears it totally eliminated all the RFI as expected only real problem I have now is to try and remember to turn it back on when leaving the wood shed.
