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Power delivery using a power bank?
So I’ve been using my pro 11 hooked up to a bunch of controllers and an audio interface using a usb hub with power delivery. It works off iPads battery but the autonomy isn’t great (1- 2hrs).
I can of course plug the usb hub to a wall socket and have the battery charged via power delivery but what I’d like to be able to do is to use my 20000mah power bank as a power delivery source.
So far I’ve tried it using all of my existing knock off cables but no success. Before I splash out on a ‘proper’ cable I would like to know whether a power bank can supply enough current or whether it is a wall socket only operation. Cheers.
Comments
I'm powering my iPad 2017 and Novation Impulse 49 just fine using an Anker 20000mah power bank. After ~3hrs usage the power bank is still pretty much full. Running AUM and a bunch of Auv3s.
Is that a usb c iPad and are you using a hub?
I’ve just tried another of my 20000mah bank with no success. I’ve also tried using an iPhone style wall adapter and that didn’t charge either so maybe the iPad isn’t detecting enough power to start charging?
@supadom Does your power bank support the USB-C Power Delivery standard? It sounds like it may be a conventional USB (5 V) power bank. USB-C PD has to be negotiated between the power source and the device. It might work if you try a USB-C cable that supports PD (there's a chip in the connector).
How does your setup work if you use the USB-C charger that came with the iPad?
I’m not an expert but my feeling is that it’s not about the cable not the bank supporting power delivery but the amount of current they pass through. All else being equal the iPhone adapter doesn’t charge the iPad while the big iPad adapter does. When I plug all the cables I own into the hub with the power bank connected I see the blue power delivery icon pop up but the iPad won’t charge.
This might be an idea, if the powered USB hub runs on 9 volt.
With this convertor you can get 9 volt DC from a powerbank USB port, into the USB hub power socket.
https://www.thomann.de/gb/joyo_jp_06w_zgpw_power_converter.htm
I can run (directly) guitar pedals with it, and also my Zoom R8 recorder. But the maximum current is 400 mA, that might be a problem for power hungry devices. I have tot test is myself to see if this works with my Ipad and USB hub.
I tried to run my Trio+ pedal (800 mA), and that pedal shuts off after a few seconds because the adapter has overload protection.
And, this one provides 800 mA, might be a better buy:
https://www.thomann.de/gb/engl_powertap_portable.htm
The key fact about USB-C Power Delivery is that it can negotiate a voltage higher than 5V in order to transfer more power. Your iPad USB-C adapter uses this to deliver ≈ 30 watts to the iPad for quicker charging. The iPhone adapter supplies only 5 W (1 A at 5 V).
This one does PD, expensive but works perfectly even with USB-C HUB, I have no issues with it.
https://www.anker.com/eu-en/products/b1290?variant=41510461997246&ref=collectionBuy
Lightning iPad and non-powered USB3 hub. Power bank connected to CCK3. Different setup to yours so not sure what's going on.
as mentioned, it is all about enough current. One can check the wall charger’s output current, and choose a powerbank with the same or higher current. Luckily there are more and more powerbanks on the market with 30-100W at the USB port.
I work in the forest, and use a small powerbank with 3A output, and a large one with 2.5A output. For music I have a 2017 iPad Pro 12,9” that needs less power than recent iPad Pro models. But even then, in day sunlight, when the brightness of the device is at 100%, its internal battery gets drained when hooked to the powerbank. So in this case the powerbank is only supporting the device. Towards the evening, the powerbank starts to charge the iPad again.
Just search for a powerbank that has 18W or better 30W PD. 30 gives some headroom. The latter even delivers enough juice to power my MacBook. I have an iPad Pro 11 from 2020. Such powerbanks are available for 40 bucks.
Do your power banks have USB-C ports?
From Wikipedia:
