jacopo_belloni .yes, if you want to check that they work. you will always need a device to be connected, so there is a close circuit. if you want to test how much the cables can handle, you can try to change device and increase the consumption or watts. up to 24 volts or 3 amps. I wouldn't recommend to go above 50 watts. if you use 12 volts devices, it will not handle more than 4 amps! best regards

jacopo_belloni first to test in diffetent condition like in the car or with common batteries and try to find there are no ways to make it work. doublecheck to have the right values like 10.5-14.5 volts as input and up to 300mA. please noticed that most users haven't. manage to make it work with more than 500 watts. collect some evidence like video clip or picture and sent in a chat with customer service

jacopo_belloni Maybethe current is too high. Maximun current is 2A, but you had better to let it work between 0.8-1 amp. Try a parallel connection using 2 or 3 step up. All positive inputs should be connected and the negative in the same way. You set each output at 6 volts if you use 2 step up. Otherwise you set it to 4 volts! have a nice day