I have the device now the second winter as trickle charger for a classic cars (Mercedes SUV with 24V system) in use, which is almost not in winter. Works beautifully, the battery is always full and the startup convincing. The device automatically detects when the battery is full and then stops. It also detects automatically that a 24V system hangs. Of course, is not a solution for all empty car / truck batteries, but the capacity is too low, that would take too long. I have the alligator clips off and a "cigarette lighter plug" drangemacht, which is easier to handle.
