1. Get to know the following basic information about the power supply you require: What are the applications, operation temperatures, and product features? Any safety certificates and product testing? How’s the reputation of the manufacturer?

2. Determine the wattage you need: Choose the PSU which has a higher wattage than the device; however, choosing an over higher wattage PSU is not necessary.

3. Choose the PSU with high-efficiency ratings: The ratings are rated under load temperatures, but not room temperatures. The efficiency of ratings will determine the cost of your electricity in the future.

4. Check the robustness of the PSU: The ability to handle changes in current for a PSU should be one of the factors that need to be taken into account. This may not be a criterion, but most of the time the PSU with greater weight represents a larger component (capacitor). 

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