I purchased an UPS to protect my ps4 slim from damages due to power cut.

UPS has capacity of 360w PS4 Slim consumes 150w (approx)

So I am having supply well above requirements still when having PS4 Slim connected to UPS; PS4 Slim is not turning on. (PS4 slim and UPS are in good working condition. PS4 Slim runs fine on direct power supply and UPS works perfect with desktop)

I am not well aware about electronics; expecting a technical explanation of root cause.