Energy consumption of Cybook Gen 3

[Kaero]

Originally Posted by JWLaRue

Any idea how this real-world test compares to the power consumption numbers Kaero provided? Does the power draw when idle, mapped against the AmpHr of the battery yield a number close to the real-world numbers?
-Jeff

Be patient, I will try to think a bit (it is not painless ) and recompute the results. Now, I think it is not so simple, because the biggest problem was offset, thus low power consumption was measured with greater uncertainty... Unfortunately I am too busy right now, so be patient please.
(and I should re-measure the consumption without sd card as I promised).

[Kaero]

Originally Posted by tompe

50% after 148 hours and dead after 158 hours with 538. So with the Cybook in library mode the result is:

• 538: 148-158 hours
• 685: 44-45 hours
• 708: 72-82 hours

Thanks for data! ( I am metrologist by heart and profession, so I would suggest to measure everything once again, but I know it is too much )

[tompe]

Originally Posted by Kaero

Thanks for data! ( I am metrologist by heart and profession, so I would suggest to measure everything once again, but I know it is too much )

I was thinking about redoing the 708 version to eliminate possible errors... But I think I will keep 538 since i will travel soon.

[BKeeper]

I have a new Gen3 (lets call it Gen3.512).

My old screen suddenly died (while in the case...). Conclusion 1: e-ink screens are excessively frail.

While amazon is replacing kindles under the same circumstances, bookenn won't.
Long story short, I got a new Gen3 with FW708. And I can assure you battery life is nowhere near what it was before.

After just one afternoon reading, it's down to 90%.

Since I can't go back to 538 I just hope Bookeen will solve this ASAP once and for all.

@Tom: any news from bookeen since your last mail?

[tompe]

No response from Bookeen but I never get response on bug reports or suggestions to enhancement. Not even when I explicitly asks for a confirmation that they have got the email.

[Kaero]

Originally Posted by BKeeper

I have a new Gen3 (lets call it Gen3.512).

My old screen suddenly died (while in the case...). Conclusion 1: e-ink screens are excessively frail.

While amazon is replacing kindles under the same circumstances, bookenn won't.
Long story short, I got a new Gen3 with FW708. And I can assure you battery life is nowhere near what it was before.

After just one afternoon reading, it's down to 90%.

Since I can't go back to 538 I just hope Bookeen will solve this ASAP once and for all.

@Tom: any news from bookeen since your last mail?

Hmm, the percent meter is not accurate. It is adjusting after few cycles of charging and discharging of battery.

[Kaero]

Hi all. Sorry for the long delay, PhD thesis and girlfriend is a deadly combination (especially time-deadly ).

Anyway I made new measurements, see the new version of the file:
http://www.physics.muni.cz/~sira/Cyb...ption_v1.1.pdf

I found some errors in my previous file. Hopefully I avoided any others in the new version. In the short about the 796 software version:
- the influence of the SD card is minimal
- the consumption of pagedown action is reduced (about 4500 flips versus 3000 of previous version of the software - it is extrapolation! but the ratio should be OK)
- Tompe measurements is in good agreement with my extrapolations (many thanks!)
- the consumption of power off is reduced
- the consumption of sleeping mode of processor is still the same, so I think still some problems in the sleeping mode comparing to the 538 version (but I never had this version).

Enjoy reading, press hard on the Cybook company to wipe out all errors (principially impossible, even one line software is faulty ).

[Barcey]

Is my math correct that power off/power on and book load energy consumption is equal to 14.3 minutes of leaving the GEN3 in sleeping mode?

Power Cycle = 5.28 + 23.37 + 5.66 = 34.31 J
Average Energy Consumpution in sleep mode for 1 sec = 0.04 Watt
Seconds = Joules / Watts = 34.31 / 0.04 = 857 Seconds

[Kaero]

Originally Posted by Barcey

Is my math correct that power off/power on and book load energy consumption is equal to 14.3 minutes of leaving the GEN3 in sleeping mode?

Power Cycle = 5.28 + 23.37 + 5.66 = 34.31 J
Average Energy Consumpution in sleep mode for 1 sec = 0.04 Watt
Seconds = Joules / Watts = 34.31 / 0.04 = 857 Seconds

Yes, correct, with firmware version 708. With 796 it is about 12 minutes. Also, the energy to load a book slightly depends on the format and probably size of the book.

[tompe]

I did my measurements for firmware 802 (the one you get in a replaced unit). The unit was on all the time and in library mode.

Total time: 3 days, 20 hours

Battery indicator:

24 h: 100%
48 h: 80%
72 h: 70%
83 h: 50%
90 h: 20%
91 h: 10%
92 h: Unit dead

And if somebody wonder why I keep it on all the time it is because my boot time is 40-50 seconds (and I consider 25 second to be to long also). Could somebody else test the boot time on 802 (or other firmware) to see what they get? I have only 286 items on the device.

[Barcey]

Boot time is 42 seconds for me with 214 items. I'm running build 796.

[ErwinOtten]

Boot time is (only) 25 seconds for me with (again only) 29 items. I'm running build 796.

[Ned]

Couldn't resist timing my own boot time after seeing all this. It's 28 seconds for 122 items on build 796

The battery meter drops to 90% after half an hour or so, but then seems to stay there for a while - though the device isn't permanently on. I keep ruining any test of battery indicator though by plugging the thing into the PC to load more books so it gets charged again.

[Ortep]

Model 512, build 796, 327 items. No SD card
After the a couple of time booting and some Deep Thought I came up with the Ultimate Answer: 42 seconds

So it seems that the more items the longer the boot time.

[HarryT]

Originally Posted by Ortep

So it seems that the more items the longer the boot time.

That's unquestionably true. It probably does a scan of the library as it starts up.