If say a result first, nothing improved yet

 

More evidence(users) are complaining Ehphase IQ7+ Inverters are showing Random Produciton Drop with 'No Grid Profile' error with Firmware v4.27 or v4.28. I have thought firmware v4.28 can resolve the issue, but, not.

 

Now, I decide to change wiring for all inverters to check the difference.

This is the current layout, there is no issue at Rear Roof, Only issue at Front Side Upper/Lower Roof.

So, I just try to simplify the front root layout.

 

layout_before.jpg

 

This is the updated front layout

 

(1) rear roof  - I have reduce the cable length by 4'

 

(2) front roof - change the wiring, and reduce the power on the wire by half. the length has reduced by 4'. and, it is a new wire from roof to load-center.

 

(3) porch - direct to JB, No more path thru on front roof panels, so, the power path has reduce by 12'

 

 

layout_after.jpg

 

Base on my calculation, this change has lmproved for the voltage rising and interference of panels (inverters). 

 

layout_single_line.jpg

The first day of test, I cannot find any noticeable difference. actually, the inverters are showing error continously. (OTL), but, I wish to compare the difference before/after the layout changes (if there is any improvements)
 

 

 

 

 

 

1. Will getting worse

2. Not related with GRID - no need to check grid or profile

3. Just power on reset - at first power on reset, it is showing 'Grid Instability Error' because no grid profile

 

https://support.enphase.com/s/question/0D52G00004ZVmwjSAD/anyone-else-having-issue-with-some-of-their-iq7-microinverters-randomly-dropping-out-around-the-same-time-every-day

 

https://support.enphase.com/s/question/0D53m00007P62ncCAB/grid-instability-issue-anyone-have-similar-issue-

 

 

I have requested a detail information abut LCF-064-1P,

     Enphase - datasheet only

     Manufacturer - can not provide it because customized item

 

No more solution with LCF, I have decided to return the filter on Enphase,

I am not sure the part is no good, or filtering is not enough. 

 

So, I start to find the solution on my way,

 

I have reinstalled RP230-30-10-S and GTX-2300

 

    BUT, it has too high line loss, so, I have disassembled & checked GTX-2300.

    the coil configuration is the two-in-hand winding, it is good for common mode filtering, But, it has lower magnetic 

leakage, so,not good for differential mode filtering. it is not much useful for me.

    so, I have removed it. and, reduce 0.5mA leakage current & 10mOhm Resistance Loss

 

     ferrite_winding.png

 

        RP230-30-10-S have 60dB 50/50 insertion loss, but, can not block

the signal from next door also, I guess, my noise level at my home is too quiet and no one use PLC devices.

Yes, high SNR, so, just Envoy signal can be detected too easily.

 

      so, I have decided to add an extra differential mode filter using ferrite

 

rp230-double_d.png

 

Ferrite core is B64290L0082X065

 

and, look the wire direction, it is the coupled differential mode, and 2 turns.

over one day, it can isolated successfuly, the expected core loss is 200-300Wh per year. 

it is much less than 1~2kWh in GTX-2300-Y02. 

 

This configuration will be saturated under 10A. so, I have tried on single turn. 

at least, I need 20A because higher current will act as a noise, and will reduce the sensitivity of enovy.

and, I just need this inductor is working at the lower current (quite) zone.

 

rp230-single_d.png

 

This is final configuration.

It is working well, now, my system has been isolated completely.

and, no more cross-domain-traffic issue.

 

The cost of Ferrite & RP230 filter is just $80, and under $100 include tax & shipping.

It will working when system current is under 24A (around 20, IQ7+),

If want to apply on the bigger system, need bigger filter