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Larry:<br><br>
Thanks very much. I am gong to do what you recommend. By the
way, the interference is said to be at about 144kHz. Do these cap
values seem to be relevant at that frequency?<br><br>
WM<br><br>
At 01:31 PM 9/25/2012, you wrote:<br>
<blockquote type=cite class=cite cite>Hello William,<br><br>
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.<br><br>
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.<br><br>
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!<br><br>
Larry Crutcher<br>
Starlight Solar Power Systems<br><br>
<br><br>
<br>
On Sep 24, 2012, at 5:47 PM, William Miller wrote:<br><br>
Friends:<br><br>
Just a heads up for those of you installing Enphase systems:<br><br>
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.<br><br>
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.<br><br>
In the meantime, I have added the following paragraph to my
contracts:<br><br>
<x-tab> </x-tab><i>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.<br><br>
</i>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.<br><br>
More later,<br><br>
William Miller<br><br>
Miller Solar<br>
Voice :805-438-5600<br>
email:
<a href="mailto:william@millersolar.com">william@millersolar.com</a><br>
<a href="http://millersolar.com/" eudora="autourl">http://millersolar.com</a><br>
License No. C-10-773985<br>
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18:34:00</blockquote>
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