Sudden fall off in Voltage on the input to the inverter can normally be attributed to weak or failing batteries I have encountered this on my 48 Volt inverter so designed and installed a battery monitoring system that keeps a 24 hour history of the Solar array and Battery voltages in my installation. The Arduino board records the data and this is uploaded to my cellphone via Blue tooth. Below are the results.
The light Blue is the Voltages of the Solar array and need to be multiplied by 10 for correct Voltage outputs notice the up and down of the voltages, this was a cloudy day. Notice how battery 3 (red) line the voltage suddenly falls off, the system is setup to charge from electricity if the voltage falls below 44 Volts (80%) and you can see that in the early hours of the morning the voltages start to rise, this is the inverter charging the batteries from the grid. If this battery maintained its voltage as the others do there would be sufficient charge until the sun was up and the Solar array could charge the batteries
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