Hi Randy,
Don't consider me an authority on solar systems -- they are an evolving
industry, and too much for me to keep up with. That said, there are (at
least) two fundamental mechanisms that I'm aware of that generate
noise. One is the charge regulation system that prevents overcharging
of the battery, and it's accomplished by pulse-modulating the charging
current in various ways. That noise is only present which there's light
hitting the panels. The other mechanism is the DC to AC inverter, and
it's present whenever the batteries are supplying 120-240 VAC. The
characteristics of both mechanisms are essentially the same -- the noise
is strongest at the lowest frequenciess, but how quickly it rolls off
with increasing frequency depends on circuit design, equipment
construction, wiring layout, and distance. My neighbor's system wipes
out 6M during the summer months during the day.
73, Jim K9YC
On 7/2/2017 4:40 AM, WX5L wrote:
Dear Jim,
In a normal solar panel installation, in your experience, should the RFI
component change after the sun light is removed? Should the RFI reduce after
the sun sets?
Also is the RFI broadband or only affects a certain area of frequencies? The
solar RFI I am having seems to be extreme only in the lower frequencies 3
mhz through 10 mhz. I can point my quad directly at the house 2 doors down
and not hear it at 14 mhz.
They also have a multi passenger family ATV that I am suspecting the
charging system.
Before I approach him I wanted to get some facts together.
Thanks,
Randy
WX5L
Solar arrays normally make noise only when the sun is on them. An
exception to this would be panels that charge batteries and then have
an inverter that runs either all the time or only when the power
company is down
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