Realistically, you'll never find a "standard" 115 VAC outlet in the wild rated to deliver 3.3 kW of power. Typically, you could get about 1,750 watts and at best 2,300 watts before tripping the breaker. The basic electrical formula for electric power is P = V x A, or power in watts = volts x amps. Almost every 115 VAC circuit with a "standard" plug outlet is rated for at 15 amps, with either a 15-amp or 20-amp circuit breaker . This means that a 115 VAC plug-in receptacle AT BEST can provide between:

115 x 15 = 1725 watts

to

115 x 20 = 2300 watts

before the circuit breaker will sense an overload and trip out. Basically, your idea of a 120/240 VAC boost transformer with 3.3 kW 240 VAC EVSE will not work, as the Volt internal charger will sense that it is connected to a 3.3 kW 240 VAC EVSE and will think it can draw up to 3300 watts. This will draw 3,300 / 115 = 28.6 amps on the 115 VAC circuit connected to the 115 VAC side of the boost transformer. This will trip the 115 VAC 15 or 20 amp circuit breaker every time.

With the Volt's standard (and no-cost) 115 VAC portable EVSE, you can set the Volt to either an 8 amp or a 12 amp charge rate. At 12 amps, it will deliver 1,380 watts. Keep your life simple and live with it if 115 VAC is all you have.