[RFI] Solar Panel RFI

[Tony]

All:

My neighbor invited me in to see his solar panel system which has a 
Solaredge PV Inverter seen here:

http://www.solaredge.com/us/products/pv-inverter#/

It's equipped with an MPPT (Maximum Power Point Tracker) which, 
according to the website statement below, has circuits that can cause 
radio and television interference. They also mention the importance of 
noise isolation and suppression.

See: https://www.solar-electric.com/mppt-solar-charge-controllers.html

My next step will be to call Solar City which is the company that 
installed the system. I'll post the outcome on the reflector ASAP.

As for the noise - it promptly disappeared after the sun went down.

Tony -K2MO

Solar-electric.com statement:

/The Power point tracker is a high frequency DC to DC converter. They 
take the DC input from the solar panels, change it to high frequency AC, 
and convert it back down to a different DC voltage and current to 
exactly match the panels to the batteries. MPPT's operate at very high 
audio frequencies, usually in the 20-80 kHz range. The advantage of high 
frequency circuits is that they can be designed with very high 
efficiency transformers and small components. The design of high 
frequency circuits can be very tricky because the problems with portions 
of the circuit "broadcasting" just like a radio transmitter and causing 
radio and TV interference. Noise isolation and suppression becomes very 
important./