[RE-wrenches] Solectria PVI 15 issue

[Tump]

Folks I have been asked to review a issue w/ this inverter.  Solectria PVI 15 DMGI245 S/N 070924-14, 3 ph 480V inverter, 70 Solon Blue 230 Watt modules. Issue is; the inverter shuts off due towhees 2 messages; “Contactor Fail" or "AC Contact Open”. Happens more frequently during cloudy weather, but it apparently its faulting more frequently.
After reset once the inverter restarts you can hear the contactor pull in and then it faults, contactor has been replaced multiple times. I have not been on site yet. 
Any suggestions would be appreciated. Thanks in advance. Tump
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