I have the device for approx. 10 EUR via Amazon Marketplace bought and did not expect much in fact, ended up being very pleasantly surprised. As a physicist, I have a part, of course, as the first time screwed and examined the "guts". It is a modern, primary switch mode power supply, built solid, with reasonable heatsinks for power semiconductors. On the output side to protect the device has a fast response fold-back current limit, so that no security is required. In addition, a primary side (not externally replaceable) fuse installed. In practice my camping cooler (Peltier element) is running properly in continuous operation. Estimated current consumption 4A, while the power supply is not even lukewarm. The problem may be, if you want to operate motorized equipment such as compressors or blowers so. These devices usually have a very high starting current and the current limit of the power supply prevents then reliably that the device is in progress. My air mattress Aufblasgebläse stutters only every second, although it really should work with the power supply with its 50W power consumption. This is of course on the (basically yes very good) current limitation of the power supply. With a selectable start-up resistance can overcome this hurdle. Conclusion: A very good device at an amazingly affordable price.
