Check with DigiKey or Mouser for a suitable (toroid wound) inductor.
Some times a "L" filter will work. To make a " L" filter tightly wrap
20' of insulated #12 Romex on a 1/2" X 12" length of re-bar. Insert in
series with the PV+ line.
Depending on the radio. Some times the internal micro processor alone
will cause interference. Or even break squelch. We off for free a filter
kit if the installation warrant it's use. We listen to Mississippi river
barge traffic during the day. Squelch never breaks.
Frank Lewon
BZ Products Inc.
7914 Gravois Road
St. Louis MO 63123 USA
314-644-2490 www.bzproducts.net
On 9/1/2010 1:42 PM, Larry Crutcher wrote:
Hello Frank,
Looks like your low pass design cutoff frequency is below 500 kHz. I
had not thought of this but I'll try it. Do you know where to find the
coil that large?
I would think that just by the nature of their design that an MPPT
controller would have this filtering.
Thanks,
Larry Crutcher
Starlight Solar Power Systems
On Sep 1, 2010, at 7:19 AM, Frank Lewon wrote:
We recommend making a Pi filter consisting of a 50 uH 30 amp medium Q
coil and .1uF 100+ volt disc capacitors. Insert the Pi filter in the
PV+ line. Wire with short direct leads to the control. Helps a lot.
Not perfect.
Frank Lewon
BZ Products Inc.
7914 Gravois Road
St. Louis MO 63123 USA
314-644-2490 www.bzproducts.net
On 8/31/2010 7:00 PM, Larry Crutcher wrote:
Does anyone know of a large MPPT controller that does not produce
RFI? Specifically, customers that are SWL, AM or amateur radio
operators need RF quiet time during the day while operating or
listening. All the controller I have installed make some noise. The
Outback MX60 in my RV decimates every 40 kHz or so with broadband
noise from 160 meters and up.
Does anyone know how the Xantrex SW, Tristar MPPT or Apollo do with
RFI?
Many thanks,
Larry Crutcher
Starlight Solar Power Systems
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