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a6400 external power options.

thingomy View Drop Down
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Post Options Post Options   Quote thingomy Quote  Post ReplyReply Direct Link To This Post Topic: a6400 external power options.
    Posted: 12 February 2021 at 15:28
I wish to do tethered photoshoots (eg time-lapse sessions) with a set of sony a6400 cameras, and somehow power the cameras externally, I currently go through batteries too fast.

The computer is a raspberry pi and cannot safely supply sufficient power so I currently have to have the usb power setting set to off in the cameras. (there are also 3 cameras running at the same time)

The usb connector is required for data, and I would rather have only a single cable running to the camera, which means Iíd rather not use a dummy battery solution.

Ideally I would need a USB cabling option that will feed through data, but take power from elsewhere. Options considered:

A USB powered hub would actually work perfectly, but I canít find details on either how much power 3 a6400s need, details on how much power each available hub can provide. (Iím aware of, and not worried about the data bottleneck issue).

There are USB Y cables on amazon, but they seem to be designed to take power from both ports, itís very close to what I need, just not quite there.

Iím ok with connecting it to the mains, but the end solution ideally needs to be portable, lightweight and fast/easy to setup. We may end up training students/beginners on using the setup.

Does anyone have any suggestions or ideas?

If I do end up stuck with dummy batteries, does anyone have any good recommendations.


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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 12 February 2021 at 17:02
Sony's solutions involve dummy batteries. They designed a small flap in the battery latch for this purpose.

The Sony AC-UUD12 7.5W A/C USB adapter supplied with the A6400 should be able to fully power it. The A6400 Help Guide indicates that the battery will not be charged when using a USB data connection. The Interval Shooting page directs: "Supply power via USB while shooting"

I know my A7III is very picky about drawing power over USB. I just plugged it in with the Sony supplied cable and adapter.

Edited by QuietOC - 12 February 2021 at 18:18
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gigo View Drop Down
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Post Options Post Options   Quote gigo Quote  Post ReplyReply Direct Link To This Post Posted: 12 February 2021 at 18:22

I have printed a battery holder for the 6300. This battery has 3.6V / 3350mAh (12.06Wh), 5V / 1A output.
The power supply from USB is not enough to cover the peak, so a built-in battery is also needed, but its consumption is so small that it remained at 100% even after half a day. I remember that the battery information recorded in Exif was 110%-> 103%.
To avoid the troublesome relationship between ground and electric potential, the monitor was done with a smartphone via Wi-Fi.

The DUMMY battery of the SONY camera is an intelligent one that tells the camera that it is DUMMY, so DUMMY that just applies voltage is useless.
And I don't think there is a battery-powered DUMMY battery for the FW-50. In other words, AC is required.

I don't use this anymore because I don't feel the need for an external battery for cameras that use a large capacity Z battery.

I hope this is helpful.
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