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1200W plug-in solar

Most state plug-in solar bills cap a system at 1,200 watts. The figure refers to the combined AC output of the system's inverter, not the rating of the panels.

How the bills describe it

The wording varies but points at the same measurement. New York's bill sets the limit as "1,200 W aggregate continuous AC inverter nameplate output" (New York). Vermont's act allows a "maximum combined inverter capacity of not more than 1,200 W" (Vermont). Several states apply the cap per meter, per customer, or per service address; the exact unit is in each statute.

Bills and statutes that use 1,200 W

Where the number is different

Not every state uses 1,200 W. Colorado sets its cap at 1,920 W. Maine uses two tiers: up to 420 W for self-installation, and up to 1,200 W when a licensed electrician installs the system. Several laws also exempt devices rated at or below 391 W from certain product-listing provisions, including Virginia and Colorado. Illinois's bill synopsis lists 391 W, an unusual figure noted in the data for verification against the bill text; it appears in the state table.

Read the source
The figures above are reproduced from the linked bills and statutes. Wattage units and per-meter or per-customer scope differ by state, so check the linked text for the state that applies to you.