Hello, I really need a way to simulate a car battery. For craft purposes, so that I don’t have to run to the car every time. How much volts can the car electrics take? With my golf I always have around 12.7 V. If I have as a device, which is constant 13,8 V, this is too much, isn’t it? How about ampere? Is a constant charge of 8 amps enough?