Hello William,
Since you have identified the cause, look to filtering the RFI at the source,
it will be easier than trying to keep it out of your Envoy. I would start with
AC line capacitors. Solder a 0.1uF ceramic cap from leg~leg and leg~ground as
close to the motor as you can, keeping leads short. Do the same at the AC input
and output to the motor controller if it has one. Make sure the motor frame has
a good ground. If possible, make sure that your PV system, monitor and the pond
motor are at the same ground potential.
Note: If a line voltage surge occurs, these caps will likely burn or explode
(small scale) so, with this in mind, be aware of placement.
I can tell you from many years experience as an amateur radio weak signal
operator, detection and reducing RFI issues are a mix of science and art. You
may want to contact your local Ham Radio club and see if they can recommend
someone that is willing to help. Good luck!
Larry Crutcher
Starlight Solar Power Systems
On Sep 24, 2012, at 5:47 PM, William Miller wrote:
Friends:
Just a heads up for those of you installing Enphase systems:
After installing over a dozen systems we came up with a job where we have been
unable to resolve interference issues. The problem is receiving data from the
inverters into the Envoy. We have tried relocating every component, using
multiples of the ferrite beads, various models of X10 filter modules, etc.
Enphase has been trying their best, remotely, to help resolve the problem but
without success. The interference is being caused by an expensive pond pump
(or we would have a new one by now). We are awaiting an AC filter module from
Digi-key. I will let you all know how it turns out.
In the meantime, I have added the following paragraph to my contracts:
Data systems: Some new inverter systems transmit data over your power
lines. On rare occasion interference from your appliances will occur that
block this data transmission. We can resolve these problems but there may be
extra charge for our time and materials.
My profit from this job has evaporated. I am writing this because I don't want
to see any of you in this situation unknowingly.
More later,
William Miller
Miller Solar
Voice :805-438-5600
email: [email protected]
http://millersolar.com
License No. C-10-773985
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