That is only true when PS completely discharged and BMS protection shuts the PS down.
When this happens Ecoflow will automatically start charging with ignition ON, but will not provide power to USB ports hence DVR, that is when you will need to switch PS off/on to power DVR, or it may happen automatically over some period of time or next time you turn the engine off and start it again.
For normal operation you do not need to switch Ecoflow on/off, it operates automatically, like dedicated batteries.
