Review on 🚗 Jebsens 4.8A 24W Dual USB Car Charger with Volt Meter & LED Display for iPhone 7 / 6s, iPad Pro, Galaxy S7, Note 5 & More by Marcus Barlow

The device looks good but has some quirks. As mentioned, the colors are pleasant at night, but a bit difficult to read during the day. I tested it with an AC adapter and a few meters with a Samsung phone and tablet connected to the unit. at 15.5 V at 3000 rpm). With such a high voltage, the device will switch between amps and volts more quickly. Even a modern car was 14.4v. Doesn't go beyond spec but I was expecting more than 13.8. Test Results: I started with a lower voltage to see what it would do. My test setup is shown. Note that the power cables were small and I think I experienced some voltage drop even at lower current like 1A. Note that I didn't measure the output current, I only measured the input voltage and current, but the output value can do not exceed the input voltage V*A. , and turn off the power. This increases the tension again and he tries again. Not at all unexpected. At 11.7V these effects disappeared and the unit was able to stably deliver an advertised 2.73A (output) for both of my devices. At this point your machine will turn off and the battery will be dead, so this is a good result. USB devices (phone, etc.) control their own charging speed. They seem to be trying to draw a ton of amps, this lowers the output voltage (assumed not measured) and the load devices then reduce their demands to bring the output voltage up again. After the backup, the devices try to draw more and the cycle repeats with less than perfect feedback, driving it into an unstable state, which is why you see some cycles in volts and amps. This is probably normal, but I think devices will figure out the optimal draw speed and try to stick to it. ±0.3V or so when a loop occurs. I think with longer input side wires I would see less of it. When charging 2 devices and both screens are on, the maximum input power was 13.3W (14VDC at 0.95A). The charger reported an output of 3.63A at this setting. 3.63 * 5V = 18.1W, which definitely doesn't happen (output power cannot be greater than input power). So either the amperage is correct but the output voltage has been reduced to 3.7V because more time is spent on the battery with the gate wide open (most likely), or the output voltage is actually 5V and the current is too high. I haven't tried connecting to the exit page so I don't know how to do it properly. Current readings were more reasonable at lower charge rates (within 10% of input power at 5V output). I've used the device in my car for several hours and found that it hardly gets warm, so its energy conversion is quite efficient. USB charging can be related to several standards, so without further measurements it is difficult to say whether the current is correct, but it certainly corresponded to the loads I gave it. The charger wasn't enough to keep up with my Galaxy Tab S, but almost. A long ride in bright sunshine with a bright screen drops about 10%, even with thick cables. But it's no different than my Anker charger, which I think is excellent. So the device delivers at least as much as the Anker which is rated for a total current of 4.8A and it's a beast so I suspect the tablet's charging circuitry just isn't up to the task of charging the battery to 100% loaded to keep bright light. Sun with screen at 100% no matter what charger is used (Anker and Jebsens did the best I've seen). Adding a phone didn't affect this result, so it's not a power issue. Basically a good device. Please comment if you measure and compare the output current.