Sunnyboy 6000 not working

[solarix]

Which string inputs are being used on the 2nd inverter? I think you have to use input "A" for the inverter to work. Also check the output of the DC disconnect (have to take the upper cover off to see if the DC voltage is making it through the switch. We had a situation once like you describe where the DC disconnect knob was being impinged by a conduit and it caused the "A" input to be poorly connected and fail.

[oregon_phil]

Thank you for responding, I’m sorry for being incomplete.
Green, Red, and Blue led’s are illuminating on complete shutdown AC VDC and start-up. I have (2-ea) one month old , 7.7 us-41 SMA inverters. Measured A/C at inverter is 246vac, DC fluctuates 200-315vdc depending sun exposure.

Start Up process is identical on each inverter as it self scrolls. Good inverter scrolls reveals vdc and amp values. .. Bad inverter has no values.. No vdc/amps show in read out.
After several hours upon checking, unit shows no led’s at all. Good inverter has solid Green and is producing approximately 5,000watts. I have Not heard fans test run on start up. Good inverter has cooling fan on during heat of day when producing.

The 2 - 18-panel strings on bad inverter have vdc and were connected to Good inverter one at ah time on vdc terminal C, which produced vac So we have shown and believe strings are of good integrity..

Configuration of system: #1 7.7SMA-41 inverter has 3 strings of 15 panels producing 5,000 watts. #2 inverter has 2 strings of 15 panels, no production even after restart.

Installer has refused to investigate,so I am stuck.
Thank you.

I'm still confused by your set up.

Inverter #1: What is panel wattage? How many strings and how many panels on each string? Does your inverter have a display or only LEDs? Do you have a direct network connection to the inverter?

Inverter #2: What is panel wattage? How many strings and how many panels on each string? Does your inverter have a display or only LEDs? Do you have a direct network connection to the inverter?

Once you start adding and removing strings, sometimes the SMA inverter thinks there is a string fault. Search this forum for "Another SMA Error Code". This might be an issue. You really need to connect to your inverter through your network to read status and parameters.

Resetting/setting inverter parameters takes installer privileges, which means the installer should be doing this or else system liability shifts from them to you.

This message thread should probably be a new post since this doesn't have anything to do with the OP's SB6000 inverter.