" (damage may occur if an ) external AC power source is applied to the inverter’s
AC outlet or its hardwire output.
CAUTION: Be sure the inverter's circuit breaker or
fuse are turned “OFF” during installation."
EDIT--it has a "terminal block" for hardwiring the 120v output.
The manual linked earlier suggests it has a hardwire outlet but the drawing in that manual does not show it. Perhaps it does have one, and that is what powers his front receptacles etc. ????
He says it no longer works. The manual refers to an inverter circuit breaker and a high temp shut off.
It is very confusing. Note the manual warning not to back feed the inverter's 120v outlets with 120v. Also note the general warning not to ever use a "suicide" (male plug at each end extension cord) set up to power a circuit.