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A "line side tap" or "supply side connection" which is the description used by the NEC, is allowed by 230.82(6) for a PV system
This is allowed to be before the meter, but if done like this it would need to be set up as a seperate service, which is allowed under 230.2(A)(5) requiring the configuration to have its own metering and service disconnecting means, etc.
In my area, with a similar installation as Harolds (400amps of backfed solar load side connected to an 800amp MDP with cold sequence metering), an 800amp MDP was replaced with 1200amp equipment to comply with 705.12(D)(2)(known as the 120% rule) because they didn't want seperate metering for the PV.
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