Refusol 20kW Inverter - blown capacitor

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jbelmont57

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Mission Viejo Ca
I am new to the forum (any forum for that matter) and hope I am posting in the right place.
Has anyone had any experience with Refusol 3TL (now AE) inverters? We recently completed a 130 kW PV installation and have had two inverters blow capacitors off of the board behind the AC side connections. First one occurred about 45 min after startup second one occurred a few weeks later. Manufacturer sent out new units, however these occurrences caused not only the inverters 40A breaker to trip but the 200A PV system breaker and the last one tripped the buildings main 1600A breaker. This site has a lot of refrigeration and it is critical to be up and running. I am a little worried about this happening again, as we have seven inverters on site. Inverters are 277V and all AC and DC circuits tested normal.
 
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