T1 charging circuit for home standby generators
Home standby generators require a sufficiently-charged battery in order to start and run. This battery is charged via the T1 circuit. The T1 wire requires a constant 120 VAC connection, regardless of which source of power is available (i.e. utility or generator power).
The T1 wire requires a constant 120 VAC connection. The power supplied to the battery may vary depending on the temperature and the charged state of the battery. More information can be found by referencing the How Is My Home Standby Generator Battery Charged and What Voltage Should It Read? article.
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