My partner and I honestly bought it to be a whole house backup battery. My regions get ice storms and we have hundreds of gallons of aquariums we'd need to keep powered through a long duration power outage. 135 kwh of battery storage cost more than the 135kwh battery truck, so we got a whole house battery backup system with wheels and cruise control. It can backstop 80 amps for 3 days.
It's pretty strange that 135kwh of stationary batteries are more expensive than 135kwh with a truck attached, seems like some one must be running a screw job on the storage batteries.
3 days is impressive if you're pulling maximum you can from the truck, if you pull anything less than that your time is greater. Our aquariums do not require all 80 amps. Max length power outage for us has been a week and the truck will easily last that long.
And totally agree about the cost of battery power banks. This was a few years ago, so things might be different now.
Besides, the aquariums are fine without power for an hour or three, so technically I could if needed.