How much will it cost to keep your Kindle Fire 10″ HD (2017 model) on all the time, to use it as a Bluetooth base station for music and wireless Bluetooth headphones? Headphones which don’t come with such a base station, as they assume you’ll be using them with a phone or tablet rather than a PC.
I found some interesting in-depth calculations on 7″ Kindle energy use in 2012. It concluded…
“16.28 Wh … 41.85 hours of video playback on a Fire for 1 penny worth of electricity.”
OK, well… that’s the USA in 2012 and the old first generation Kindle 7″ from 2012.
Some additional factors for 2019…
i) Let’s assume that, due to green energy taxes and huge price hikes, our UK electricity costs twice as much compared to the USA in 2012. Let’s put it at 1 British penny for every 2012 US cent.
ii) Let’s assume that audio places a little less drain than video on the tablet’s energy use, but not much.
iii) We know that the Kindle Fire 10″ HD (2017) has a 14.171 Wh rating — so the powerful 10″ tablet actually draws less than the old 7″ did in 2012!
Let’s assume these factors combine and balance out to give us perhaps 0.8 pence per 48 hours of media playing on a Kindle Fire 10″. That looks like a fair guess, and errs on the high side.
Now let’s assume that the tablet is only turned off for eight hours of every 24 hour day, and is constantly playing music or video for 16 hours a day. It’s not on a battery charge cycle, as it’s permanently wired to the power socket by USB. The screen is not allowed to slip into low power mode, so that the excellent and strong Bluetooth keeps working and the audio keeps playing. Even then, at 0.4 pence per day I put the total power consumption at about £1.50 of power per year.
However the huge drawback of using the Kindle as a player / base-station is the frequent automatic reboots you often get. The tablet often decides to reboot itself, sometimes several times with a 30 minute space. This problem makes it infeasible for use as a base-station, despite the very low power draw, unless there’s some way around that I don’t know about.
Thus, the PC must be the audio player. Which means that a simple modern USB Bluetooth dongle in v4.1 with audio-boost aerial-pod is a better choice for playing audio from your PC to wireless headphones.