Quick Answer
To reduce noise from MPPT charge controllers, consider using a low-noise controller, mounting it away from living spaces, and ensuring proper grounding and electrical shielding.
Choosing a Low-Noise MPPT Charge Controller
When selecting an MPPT charge controller, look for models that explicitly mention low-noise operation or have a high signal-to-noise ratio (SNR). For example, the Renogy 40A MPPT controller has an SNR of 80 dB, which is significantly higher than the 50 dB SNR of the Renogy 20A MPPT controller. If you’re using a controller with a low SNR, consider upgrading to a better model.
Mounting and Grounding Techniques
Proper mounting and grounding can significantly reduce electromagnetic interference (EMI) and noise from the MPPT charge controller. Mount the controller away from living spaces and other sensitive electronics, and use a grounding strap to connect the controller to a grounding point. This helps to dissipate electrical noise and prevent it from propagating through the system.
Electrical Shielding and Filtering
Electrical shielding and filtering can also help reduce noise from the MPPT charge controller. Consider installing a Faraday cage or a shielded cable bundle around the controller and its connections. Additionally, use a 10-20 Hz low-pass filter on the controller’s DC output to remove high-frequency noise and ripple. This can help ensure smooth power delivery and reduce noise in the system.
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