How many potted plants can this watering kit support at most?

It comes with a 49.9 ft long hose and 15 drippers, which can be inserted into each plant and can support 15-20 potted plants.

How long does this drip irrigation work on a full charge? (The solar panel will not be charged during this period)

Equipped with a 2200mAh battery, which allows the device can work for 15-20 days after the battery is fully charged.

Will the pump automatically shut off if the water supply runs out? so that the motor doesn't burn out?

Yes, if the water level is low the pump will beep (twice) and the controller will shut down to protect the pump. After adding water, the system will continue to run on the previous watering schedule.

Is the system suitable for indoor plant watering?

Yes, but please install the solar panels at an optimal angle of 45 degrees in direct sunlight and no shade.

Is there a lot of water coming out of this device for plants？

The water flow rate of this device is 400ml/min. If you water 15 pots and choose the 5min/24h timer mode, which is the minimum amount of water, each plant will get about 135ml/4.5oz of water per day.