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February 4th, 2019 10:00
Inspiron 7586 USB Power Delivery?
Hello,
I have purchased an Inspiron 7586 and am awaiting delivery.
I wish to purchase a dock for this laptop. It's unclear to me if this laptop supports USB Power delivery (charge the laptop via the USB-C port).
The product/store page suggests it does (see ports and slots in product details tab): https://www.dell.com/en-us/shop/dell-laptops/inspiron-15-7000-2-in-1/spd/inspiron-15-7586-2-in-1-laptop
However, the user guide makes no mention of USB Power Delivery: https://topics-cdn.dell.com/pdf/inspiron-15-7586-2-in-1-laptop_users-guide_en-us.pdf
It's not important for me that the laptop does support power delivery. However if possible I would like to purchase a dock that does provide USB Power delivery for future proofing.
I would be grateful if anyone could clarify
1) Does this laptop support USB Power Delivery?
2) Is it safe to use a dock which does support USB Power Delivery (e.g Dell WD15) with a laptop that does not?
Thanks
telliott123
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May 19th, 2019 14:00
I had this dock. I had bought it to use with my Chromebook but am using it with my Inspiron 7586. It works great with one exception that isn't documented anywhere. It limits USB power throughput to 60W. My laptop complains that it wants at least 65W. The USB power supply is actually 90W. It seems to charge just fine but even with warnings turned off, the laptop will at random times sit at the Dell logo when powering it on till I remove the USB C dock and turn it off and on again.
Dock: https://en.j5create.com/collections/featured-products/products/jca374
Power supply: https://www.bestbuy.com/site/insignia-type-c-wall-charger-black/5880500.p?skuId=5880500
I probably won't get another dock unless I find a good deal on one that hass the connections I need and I KNOW it has a power throughput of 65W or greater.
jphughan
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May 19th, 2019 19:00
@telliott123 are you sure the 60W limitation isn't related to the cable? 60W is the maximum power capacity of "normal" USB-C cables because the standard rating is for 3 amps, which at 20V is 60W. In order to go above that, you need to get cables that are rated for 5 amps, which at 20V is 100W. I have a Nekteck 65W USB-C wall charger, and when I use a standard USB-C cable, I only get 60W even to systems that can accept more, but when I connect a 100W cable, I get 65W. If on the other hand the dock itself is limiting is output to 60W, then there's nothing you can do about that.
jphughan
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May 19th, 2019 20:00
@osm sounds like you've already gotten an answer based on actual experience above, but just as a general note, simply checking for USB Power Delivery support can be misleading. The reason is that USB Power Delivery can go both directions, and systems do NOT have to support it in both directions. Dell makes some laptops where the USB-C port is billed as supporting USB PD because they support USB PD to provide power to attached peripherals, typically up to either 7.5W or 15W -- but some of those laptops do not support being charged from that port at all. In theory, I suppose you could have the opposite, i.e. a system with a USB-C port that could be used to charge the system but only supported standard USB power levels for output rather than higher USB PD levels, but I don't know of systems like that.
telliott123
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May 20th, 2019 13:00
It's probably sthe cable but it's built in to the dock. You would probably need a more expensive dock that's specifically designed to deliver more power. If you find one, post it here.
jphughan
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May 20th, 2019 14:00
@telliott123some Dell docks can supply up to 90W, and even up to 130W to certain Dell systems. The new WD19 with a 130W AC adapter can deliver up to 90W, and the WD19 with a 180W AC adapter can supply up to 130W. The WD19TB can also supply up to 130W. That model uses Thunderbolt 3 if the system supports it, but thanks to Intel's new Titan Ridge controller is also backward-compatible with regular USB-C with reduced functionality, rather than being completely unusable with non-Thunderbolt systems like most Thunderbolt peripherals on the market today. And the older WD15 and TB16 docks that have been around for a while can also supply more than 60W to Dell systems, but those were replaced by the new WD19 models, so there isn't really a good reason to get them unless maybe you can get a good deal on them somewhere. But in that case, the power delivery capability depends on the AC adapter used with each dock. The WD15 w/ 130W adapter and TB16 w/ 180W adapter can supply up to 90W to Dell systems (60W to other systems). The WD15 w/ 180W adapter and TB16 w/ 240W adapter can supply up to 130W to Dell systems (still 60W to other systems).
I also know StarTech makes some docks that can supply 87W (which is what the 15" MacBook Pro requires for max functionality), although those might be Thunderbolt-only.