[RE-wrenches] Pulsing with AC coupling

[drake.chamberlin at redwoodalliance.org]

We do take it off line when the pulsing is bad.  

---

On 2020-08-25 12:08, Jay wrote:

> Hi drake 
> 
> I did a small enphase system with my 3524vfx some years ago. It was 3 M190's.  
> 
> It had the same issues. Mostly it appeared during when the loads  vs AC production were at a specific level 
> 
> If the AC was high and loads low, it was fine.  
> If the ac low and loads high no issue  
> 
> But if they were close then I'd get the pulsing you are talking about.  
> I don't have a scope, best guess is its harmonics.  
> 
> I didn't like the pulsing and thought that it's bad for compressors, lights, etc so I stopped using it.  
> 
> I don't know if is something specific to older vfx units or emphase or? 
> 
> I would take it off line 
> 
> Jay 
> Peltz power.  
> 
>> On Aug 25, 2020, at 8:34 AM, drake.chamberlin at redwoodalliance.org wrote:
> 
> The inverter is set to ON not to SEARCH. If the Enphase circuit is switched off, the pulsing stops immediately. This system has both AC and DC coupling. 
> 
> In another location, with a Sunny Boy AC coupled with a pair of stacked VFX3524  inverters, there is some pulsing in low light conditions. The Radian and Enphase combo is much more noticeable.
> 
> ---
> 
> On 2020-08-25 10:42, Jerry Shafer wrote: 
> 
> Wrenches 
> I would think that in time there might be damage. Check to make sure the inverter is not on search but I stead "ON", next if you turn off the enphase the the outback perform normally. Check the inverter frequency to see your frequency is shifting have one that has both AC & DC Coupling and no issues. 
> 
> On Tue, Aug 25, 2020, 6:37 AM <drake.chamberlin at redwoodalliance.org> wrote: Hello Wrenches,
> 
> An AC coupled arrangement, with an 8 kW Radian and 8 Enphase 
> microinverters, pulses lighting at low levels of array illumination. 
> This is generally not too much of a problem.
> 
> Under certain levels of solar isolation, the pulsing becomes extreme and 
> causes the motors in the refrigerator and air-conditioner to pulse, 
> sometimes causing very audible vibrations.
> 
> Will this harm the appliances? Is there anything that can be done to 
> moderate or stop the pulsing?
> 
> Thank you,
> 
> Drake
> Athens Electric LLC
> 
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