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)