Tony-
What type ferrite toroid did you use in your three-turn choke?
AG6CX
Sent from my iPhone
> On Sep 14, 2018, at 1:00 PM, Tony Brock-Fisher via RFI <rfi@contesting.com>
> wrote:
>
> From my testing, the optimizers internal switchers continue to run (at
> 200kHz) anytime the optimizer gets power from the panel - therefore during
> daylight hours. This noise exits the optimizers on both the panel leads as
> well as the DC output leads. This was the reason I retrofitted my system with
> the 3-turn bifilar chokes, in between each optimizer and it's panel.
>
> During power generation, the optimizers emit higher levels of noise, from
> both the panel leads and the output leads, at the 200khZ switching frequency
> and harmonics, up through 10 meters or higher.
>
> If the DC output leads have already been properly retrofitted with reduced
> loop area, twisted pair wiring, and chokes, it may now be beneficial to add
> the 3-turn biifilar chokes to the optimizer input leads. I noticed a
> significant improvement in noise when I completed this step on my system.
>
> Disconnecting every panel from every optimizer is very labor intensive.
> While this experiment might provide conclusive information about the cause of
> the noise, it won't buy you anything in actual remediation. For the same
> amount of labor, and a moderate additional materials cost, you can add the
> 3-turn bifilar chokes to the optimizers, with the likely result of
> permanently lower noise when the work is completed. This would actually be
> less labor, as the panels can be lifted one at a time, not requiring they be
> removed from the roof, as the chokes are added underneath them. Note that
> this technique has been applied to multiple systems with good results each
> time.
>
> This is like 'peeling the layers of the onion', and you may need to address
> several 'layers' before you get the noise down to an acceptable level (which
> may never get to 'zero noise').
>
> -Tony, K1KP
>
>
>> On 9/14/2018 3:40 PM, Tony wrote:
>> All:
>>
>> Solar Edge shut down my neighbors solar panel system to test for RFI this
>> week. The strength of the noise dropped, but it's still detectable. I'm told
>> that the inverter and optimizers are inactive which my neighbor confirmed.
>>
>> The problem with this test is that the power supplies within the optimizers
>> remain active since they receive their power from the solar panels. The
>> noise is also typical of the type generated by switching power supplies.
>>
>> The next logical step would be to disconnect the power supplies from each
>> solar panel to see if the noise goes away. It's something I've asked Solar
>> Edge to do for some time now.
>>
>> Before I make that request, does anyone have any thoughts on what else could
>> be generating noise with the system turned off?
>>
>> Tony -K2MO
>
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