The adapters are NOT grounded, only 2 pin. It works ok Besides the adapters can go to 2A. Connected on battery, you do have enough power, Voltage and Amps. The battery is not grounded and it works. Devices connected to adapter or any other supply control the amps. If you use lower power supply in amps and not able to deliver, it can effect working. Device needs let s say 1.5 A and your supply only can do 1 amp. Power, fi Voltage can go down. Working can be effected. You can measure on end of line, but then you measure open voltage and can be right. However if it is connected and current is used, then you can have a complete different situation and voltage can dip. Length of cable could effect voltage, to weak and too long wire , voltage can drop significant for device. You use a supply WITH ground, then it goes wrong. See what it does if you only use 2pin and NO grond. Housing of supplies can be metal and therefor it needs to be grounded. For safety reasons, if something is wrong and the housing would be under power. If you dont use the ground, you lift safety. Thats why it is so nice to have RCBO's, protection. There are supplies which use ground to eliminate interference. But then it has to be "clean" as possible. Good power supply has also filters and in other cases, ferrite devices are used in cables. If you have a power supply doing 20-30 Amps, it should be enough for 9 cams.
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