[RE-wrenches] RFI from MPPT Charge Controllers

[Exeltech]

Larry,

As you've already surmised, all switchmode units generate RFI.  The usual steps apply:  1) Move the radio antenna as far from the controller as possible; 2) Use coax for the feedline; 3) A set of high-current chokes on the MPPT input and output, connected right at the unit will help (along with appropriate bypass caps); 4) Shield the unit (Faraday shield), then thoroughly ground the shield.  #1 is your best bet, but nothing is going to completely eliminate the noise.


Dan


--- On Tue, 8/31/10, Larry Crutcher <larry at starlightsolar.com> wrote:

> From: Larry Crutcher <larry at starlightsolar.com>
> Subject: [RE-wrenches] RFI from MPPT Charge Controllers
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Date: Tuesday, August 31, 2010, 7:00 PM
> 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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