How can you use B300 alone? I know you can use the usbc ports, but can you connect an inverter to the cigarette lighter port to plug into?
Yes, you can connect a small inverter to the cigarette lighter socket. Generally, if the small inverter has a cigarette lighter plug, it means that its DC input is rated for 8/10A, so it can be used with the B300.
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As small inverter, we are talking about a maximum AC output of 100W; larger capacity inverters may activate an OCP (overcurrent protection) on the B300 and are therefore not recommended.
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Please note that using a small inverter is not efficient as the voltage will be converted too many times resulting in a substantial loss of efficiency (48 DC → 13 DC → 110/230 AC → ?? DC) as each voltage conversion corresponds to a loss of energy. It is always recommended to use the DC outputs directly to take advantage of as much energy as possible from the battery.
Before you buy any third party equipment wait a few weeks for news about the Bluetti D1 Hub. It looks like it can work stand alone with expansion batteries. It connects to the expansion cable port and it is a 700 watt DC inverter with a 12V and 24V toggle and an Anderson port that can output 600 watts.