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Can't get iPad to charge while audio interface connected

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Comments

  • Blipsford_BaubieBlipsford_Baubie

    @uncledave said:
    OK. So that says you're looking for a PD power bank with at least 30 W output to power the hub and charge the iPad. Your present power bank only provides 10.5 W, so no surprise that it performs worse. A couple of further thoughts:

    1. Your iPad will run for a few hours on its battery, so charging while playing is not essential. Depends of course on how long you'll be without mains power.

    Agreed. This hasn’t certainly stopped me so far. If i can even get two hours of uninterrupted time, then that’s a great day for me! I’ll wait a couple years for my new iPad battery to start wearing down before buying a suitable powerbank.

    1. Do you really need the hub (really a dock) with its many features? It probably contains a serious computer processor to support all that, especially the video output (it has to decode the video data stream and drive the HDMI pins). One of the many USB-C adapters with a single USB port and PD would do the job and use a lot less power. That might let you get away with a smaller power bank.

    Yes, the reason i bought this latest dock is because of the 3.5 mm headphone Jack. I didn’t find many with a jack. Well, i did find cheaper compact looking ones with 3.5 mm, but i was concerned with noise bleeding problems. It also eliminates the need for my DAC (Dragon Fly). I’m also using my old ipad mini2 as a BT midi controller. At least i can use the second usb port for charging that if i have to, which i already confirmed works with my full setup.

  • wimwim
    edited January 12

    I'd borrow or buy a power supply with 30-65 wats of output from a returnable source and see what happens. Days and days of guesswork are an inefficient way to figure something simple like this out.

    It seems pretty obvious this is a power level issue. Once that's established or ruled out for sure, the search for the end solution can either be narrowed down or the quest called off as impractical.

    I wonder if something like this would be of any help ...
    $15.99 US

    https://a.co/d/2eWStVk

  • Blipsford_BaubieBlipsford_Baubie
    edited January 12

    @uncledave

    I forgot to ask how you determined that my current powerbank is only delivering 12.5W, given with the limited specs found online. I’m not questioning you. I’m simply trying to learn something.

    >

    @wim said I'd borrow or buy a power supply with 30-65 wats of output from a returnable source and see what happens. Days and days of guesswork are an inefficient way to figure something simple like this out

    I’m a machinist. Precision guess work is what we do 😉

  • wimwim
    edited January 12

    @Blipsford_Baubie said:
    I’m a machinist. Precision guess work is what we do 😉

    It's the American way! 😉

    But then again so is "Ready! Fire! Aim!"

  • espiegel123espiegel123

    @Blipsford_Baubie said:
    @uncledave

    I forgot to ask how you determined that my current powerbank is only delivering 12.5W, given with the limited specs found online. I’m not questioning you. I’m simply trying to learn something.

    >

    @wim said I'd borrow or buy a power supply with 30-65 wats of output from a returnable source and see what happens. Days and days of guesswork are an inefficient way to figure something simple like this out

    I’m a machinist. Precision guess work is what we do 😉

    That battery’s specs indicate that it provides 15 watts. If you look at the specs linked to from the page you posted, it is capable of 3 amps. At 5 volts that is 15 watts.

  • uncledaveuncledave

    @Blipsford_Baubie said:
    @uncledave

    I forgot to ask how you determined that my current powerbank is only delivering 12.5W, given with the limited specs found online. I’m not questioning you. I’m simply trying to learn something.

    The power bank you linked has 2 USB ports, providing power at 5 V (shown in the pictures, and in the detailed specs farther down). The higher powered output supplies 2.1 A, so 5 x 2.1 = 10.5 W (not 12.5). That's useful charging power for a Lightning iPad, or a phone, but not for a USB-C device. The lower power output is 1 A, basically a phone charger.

  • espiegel123espiegel123

    @Blipsford_Baubie : if the powerbank can only provide 15 watts, some of that is going to be needed by the hub. My hub says that it consumes about 5 watts. Maybe yours consumes less.

  • uncledaveuncledave

    @espiegel123 said:

    @Blipsford_Baubie said:
    @uncledave

    I forgot to ask how you determined that my current powerbank is only delivering 12.5W, given with the limited specs found online. I’m not questioning you. I’m simply trying to learn something.

    >

    @wim said I'd borrow or buy a power supply with 30-65 wats of output from a returnable source and see what happens. Days and days of guesswork are an inefficient way to figure something simple like this out

    I’m a machinist. Precision guess work is what we do 😉

    That battery’s specs indicate that it provides 15 watts. If you look at the specs linked to from the page you posted, it is capable of 3 amps. At 5 volts that is 15 watts.

    Actually, that's one port with 2.1 A, another port with 1 A. So the useful power is only 10.5 W. Don't think you could parallel them to access 15 W.

  • espiegel123espiegel123

    @uncledave said:

    @espiegel123 said:

    @Blipsford_Baubie said:
    @uncledave

    I forgot to ask how you determined that my current powerbank is only delivering 12.5W, given with the limited specs found online. I’m not questioning you. I’m simply trying to learn something.

    >

    @wim said I'd borrow or buy a power supply with 30-65 wats of output from a returnable source and see what happens. Days and days of guesswork are an inefficient way to figure something simple like this out

    I’m a machinist. Precision guess work is what we do 😉

    That battery’s specs indicate that it provides 15 watts. If you look at the specs linked to from the page you posted, it is capable of 3 amps. At 5 volts that is 15 watts.

    Actually, that's one port with 2.1 A, another port with 1 A. So the useful power is only 10.5 W. Don't think you could parallel them to access 15 W.

    I didn’t catch that detail (the two ports). Even at 15 watts minus what the hub needs doesn’t seem sufficient.

  • espiegel123espiegel123

    @Blipsford_Baubie @uncledave : I looked up the Anker hub and it consumes up to 15 watts.

  • uncledaveuncledave

    @espiegel123 said:

    @uncledave said:

    @espiegel123 said:

    @Blipsford_Baubie said:
    @uncledave

    I forgot to ask how you determined that my current powerbank is only delivering 12.5W, given with the limited specs found online. I’m not questioning you. I’m simply trying to learn something.

    >

    @wim said I'd borrow or buy a power supply with 30-65 wats of output from a returnable source and see what happens. Days and days of guesswork are an inefficient way to figure something simple like this out

    I’m a machinist. Precision guess work is what we do 😉

    That battery’s specs indicate that it provides 15 watts. If you look at the specs linked to from the page you posted, it is capable of 3 amps. At 5 volts that is 15 watts.

    Actually, that's one port with 2.1 A, another port with 1 A. So the useful power is only 10.5 W. Don't think you could parallel them to access 15 W.

    I didn’t catch that detail (the two ports). Even at 15 watts minus what the hub needs doesn’t seem sufficient.

    Exactly. The Apple 20 W charger doesn't do it. The 10.5 W power bank certainly won't.

  • espiegel123espiegel123
    edited January 13

    @Blipsford_Baubie said:
    Sure @uncledave , i appreciate it.
    Yes, it’s a newer hub with usb-c PD.
    100W PD.
    https://www.amazon.com/gp/aw/d/B096LV7W9D?psc=1&ref=ppx_pop_mob_b_asin_title

    Here is the power bank.

    https://www.amazon.com/gp/aw/d/B07XQ94ZL9?psc=1&ref=ppx_pop_mob_b_asin_title

    There is no information in the specs for Watts. Only mAh and Volts. I had foolishly assumed that since those two specs met what i required, that the Watts naturally would fall in line. But, ecou schooled me earlier in the thread what the different specs mean.

    ….

    @Blipsford_Baubie a few notes that might be helpful in assessing future purchases. This picture from the Amazon page for the hub, let’s you know that up to 15 watts are consumed by the hub

    The page for the power bank has this picture which has the information you can use to determine the wattage it can deliver:

    Volts * Amps = Watts

    So 5 volts * 2.1 Amps

  • tahichetahiche

    I face a similar issue with the Behringer UMC204 audio interface. Using an Apple iPad charger and a PD hub. The iPad displays its receiving charge, but the iPad + soundcard seem to use more power than what is received so the battery goes down even when plugged. Extremely annoying. I don’t know if I need a new charger or a new hub.

  • wimwim

    @tahiche said:
    I face a similar issue with the Behringer UMC204 audio interface. Using an Apple iPad charger and a PD hub. The iPad displays its receiving charge, but the iPad + soundcard seem to use more power than what is received so the battery goes down even when plugged. Extremely annoying. I don’t know if I need a new charger or a new hub.

    The best place to start is to determine the output of the charger in watts.

  • uncledaveuncledave

    @tahiche said:
    I face a similar issue with the Behringer UMC204 audio interface. Using an Apple iPad charger and a PD hub. The iPad displays its receiving charge, but the iPad + soundcard seem to use more power than what is received so the battery goes down even when plugged. Extremely annoying. I don’t know if I need a new charger or a new hub.

    And check on the power requirement of the hub. If it's one of the multi-function docks, it likely takes at least 15 W just to power itself.

  • espiegel123espiegel123

    @tahiche said:
    I face a similar issue with the Behringer UMC204 audio interface. Using an Apple iPad charger and a PD hub. The iPad displays its receiving charge, but the iPad + soundcard seem to use more power than what is received so the battery goes down even when plugged. Extremely annoying. I don’t know if I need a new charger or a new hub.

    The Apple chargers tend to be made to charge the device it came with and are under-powered for anything besides that.

  • tahichetahiche

    @espiegel123 said:

    @tahiche said:
    I face a similar issue with the Behringer UMC204 audio interface. Using an Apple iPad charger and a PD hub. The iPad displays its receiving charge, but the iPad + soundcard seem to use more power than what is received so the battery goes down even when plugged. Extremely annoying. I don’t know if I need a new charger or a new hub.

    The Apple chargers tend to be made to charge the device it came with and are under-powered for anything besides that.

    Thank u all. So what would be a “sure bet” for a charger in watts?. Any advice?. I assume that higher watt is not dangerous as the iPad will just take what it needs, right?. Excuse my energy/electronics ignorance, I find it a fascinating subject but i don’t know shit.

  • espiegel123espiegel123

    @tahiche said:

    @espiegel123 said:

    @tahiche said:
    I face a similar issue with the Behringer UMC204 audio interface. Using an Apple iPad charger and a PD hub. The iPad displays its receiving charge, but the iPad + soundcard seem to use more power than what is received so the battery goes down even when plugged. Extremely annoying. I don’t know if I need a new charger or a new hub.

    The Apple chargers tend to be made to charge the device it came with and are under-powered for anything besides that.

    Thank u all. So what would be a “sure bet” for a charger in watts?. Any advice?. I assume that higher watt is not dangerous as the iPad will just take what it needs, right?. Excuse my energy/electronics ignorance, I find it a fascinating subject but i don’t know shit.

    I opted for an Anker 95 watt usb-c charger as several people that understand the electronics assured me that the wattage of the power supply is the capacity and that devices just draw what they need in this context.

  • Blipsford_BaubieBlipsford_Baubie

    Thank you @espiegel123 and @uncledave for helping me understand the correlation between amps, volts, and watts.
    Also, I’ll remember to pay more attention to the pictures! I feel empowered now.

    Understanding these things will carry me even when the new next ports and adapters come out. Things electrical and chip-wise have been a skeleton in my closet. Unless they’re potato chips, then I’m a self-proclaimed expert!

  • GoldiblockzGoldiblockz
    edited January 14

    FWIW.

    I have had great success using this 30w Anker Nano power brick.

    I have it going into a powered USB-C hub, also by Anker. That is also supplying connection to a 4x USB-A hub from them.

    It's powering a 11" iPad Pro, Moto M2 with a condenser mic, MIDI Fighter Twister, Keystep 37 and a 64 grid RGB pad controller.

    My suggestion is 65w power brick or higher for best stability and to make sure you have juice to charge with, but even 30w has been very stable for me. Sometimes it will dip in battery but that’s very rare.

  • wimwim

    Yes, I was going to suggest 65W as what seems to be a reasonable price/capacity tradeoff when I've been out looking. I could see 30W getting consumed pretty quickly depending on the devices attached. I'd rather have a little more wiggle room.

    Be really careful with specs. It's the single port USB-C output wattage you're after. A 285W power supply with multiple ports will have much lower max output per port than the total wattage. Most list the max wattage for each port.

  • GoldiblockzGoldiblockz

    Also take into account that different ipads can charge at different maximum rates.

    Previously ipad pros charged at up to 30w, now the M4 models, at least, charge at up to 40w.

    Definitely suggest a single port 65w or higher brick for best stability.

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