what size power supply do i need

LED advertising light boxes​

Laptop computer​

Electronic blood pressure monitors​

Grinding machines (electric)​

To supply power to underwater drones (if camping near water) to explore the underwater scenery around the camping site

To charge portable WiFi devices to enable stable internet connection during camping​

To supply power to portable angle grinders to grind the sharp edges of camping equipment (ensure safety)

To power blood glucose meters for diabetes patients to monitor blood sugar levels during camping​