Why does the bill offset seem too low?

The OnGrid Tool assumes customer charges (i.e. flat monthly fees) and demand charges will not be offset by Solar. Those charges would always be part of the bill. So if a bill is comprised of 50% energy charges, 25% customer charges, and 25% demand charges; and if the solar system were sized to offset 100% of the energy charges, the bill offset would still be only 50%.

This effect usually only occurs for medium and large commercial/general service rate schedules.

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