| Brand | CanaKit |
|---|---|
| Item model number | DCAR-RSP-2A5 |
| Item Weight | 0.01 ounces |
| Product Dimensions | 3.75 x 2.75 x 1.25 inches |
| Item Dimensions LxWxH | 3.75 x 2.75 x 1.25 inches |
| Manufacturer | Cana Kit Corporation |
| ASIN | B00MARDJZ4 |
| Is Discontinued By Manufacturer | No |
| Date First Available | July 31, 2014 |
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From the manufacturer
CanaKit 5V 2.5A Raspberry Pi 3 Power Supply / Adapter / Charger
The CanaKit 2.5A Raspberry Pi power supply differs from typical standard 5V USB power supplies in the market in that it can deliver a full 2.5A and still output a voltage well within the USB minimum voltage specifications. This adapter has been incorporated as an inline noise filter for highest stability and reliable operation.
The power supply still has about 0.5A of output power to spare, so even at the maximum current supported by the Raspberry Pi 3, the power supply is not at it's absolute maximum. It is also ideal for use by anyone over-clocking the Raspberry Pi which causes higher power requirements that a lower power adapter may not be able to supply. With this power supply, you can power the Raspberry Pi 3 at full load as well as up to 1.2A across the four USB ports.
- This adapter has been specially designed and tested for the new Raspberry Pi 3.
The attached image shows measured IV curves for this power supply compared to a 2.0A power supply (Kootek). I generated these with a RPi-based IV curve tracer that I built for solar panels (search for "IV Swinger" on YouTube and/or GitHub if you're interested in knowing more about it). It's not intended for such small voltages, but it worked pretty well.The IV curves show the current (I) and voltage (V) for different resistances (R). This tells the story about how the supply delivers power for different loads (power = I * V).You can see that both supplies have an open-circuit voltage of 5.3V. That is the lower rightmost point. R = ∞Ω, I = 0A, P = 0W.The upper left points of each curve are the closest to R = 0 (short circuit) that we can measure (R = 0.94Ω due to wiring resistance). You can see that the Kootek delivers just about 3A of current and the Canakit delivers about 3.8A. But at this point both are way below 5V (below 3V, in fact.).An interesting point is where the curves cross their rated current values. The Kootek 2.0A supply crosses 2.0A at about 4.6V (2.0*4.6 = 9.2W). The Canakit 2.5A supply crosses 2.5A at about 4.5V (2.5*4.5 = 11.25W). Both of these are well below 5V. Probably high enough that the RPi won't crash, but cutting it close.Another interesting point is where the curves cross 5.0V. The Kootek 2.0A supply crosses 5.0V at about 0.8A (0.8*5.0 = 4.0W). The Canakit 2.5A supply crosses 5.0V at about 1.0A (1.0*5.0 = 5.0W).People who are claiming that this supply doesn't deliver 2.5A are correct - if they are expecting it to deliver 2.5A at 5.0V. But what is important is whether the supply is sufficient for the RPi 3. All I can say for sure is that it does deliver proportionally more power than a 2.0A-rated power supply that has worked fine for me with the Gen 1 RPi B+. For that reason, I'm giving it four stars.For anyone with specific voltage requirements at the rated (or other) current, you can read the values off the IV curve in my attachment.
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Hasta ahora no he tenido inconvenientes
Reviewed in Mexico 🇲🇽 on July 28, 2018
