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It is rated to produce up to about 460 watts under standardised laboratory conditions. Twenty-five of them make 11.5 kW DC; twenty-six make 11.96 kW. The panel count and the wattage should multiply out to the DC system size stated in the proposal -- if they do not, something has been rounded that should not have been.

Generally yes when everything else is equal, but size alone does not decide annual production. A smaller unshaded south-facing array can outproduce a larger one that is shaded or poorly oriented. Azimuth, tilt, shading, inverter efficiency and module characteristics all bear on it.

One that can design, permit, interconnect, install, commission, monitor and service the system, and explain the structure accurately. That means twelve months of real usage, a realistic production model, correct kW and kWh arithmetic, orientation and shading, structural capacity, the rooftop code requirements, the electrical articles for photovoltaic systems and grid interconnection, rapid shutdown, manufacturer installation instructions, utility interconnection and net metering, incentive registration, roof age and condition, penetration and waterproofing detail, the panel, inverter, mounting and workmanship warranties, monitoring, and service after the installation. The question worth asking is not who quoted least, but which company has designed the best long-term system for the house and will still be able to support it years from now.