Being a Ham radio operator and having a Ham radio on board I am very aware of noise generation. With
MPPT controllers you get what you pay for. I've used three different
mppt controllers with an eye towards low RFI (radio frequency interference). The cheap one's on Amazon are the worst. Broad spectrum noise on the shortware/HF bands (so if you plan to get some of your weather from shortwave you will have to disconnect your charger to hear anything). I settled on an expensive Morning Star Tri Star
MPPT contoller (
https://www.amazon.com/gp/product/B010G ... bw_c_x_2_w that has FCC Class B certification for my 240 watt 4X4 van setup. When I was first looking there were very few options for low power
MPPT with FCC Class B. It made mobile Ham radio operations possible during the day when the sun was out!
For the boat I found a lower cost controller designed by an EE that is also a Ham radio operator.
https://www.diysolarforu.com/store/c1/F ... ducts.html. It is perfect for up to 16 amps or 300 watts. Works great, good price, not over kill and very RFI quiet.
Captain Paula of the good ship AirWave