Good data point.
The expense is why I followed up with the cheaper option. The Prius has no huge start load, so it could easily handle the job. You just wouldn't want to keep the car in accessory mode for more than a minute, or leave the dome lights on while parked. LED dome lights can help with that aspect.
If I still had the Prius I'd be tempted to run the smaller battery simply to free up the 20Ah one to run other more demanding things.
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