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Keep the head unit in sleep mode.

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lambition

Senior Member
Mar 22, 2010
175
18
As we all know android head unit is slow to boot when it is shutdown (cold boot). But is reasonably fast when it is just waking up from sleep (ignition turned off less than a set time and turned back on).

So, I was wondering if anyone tried keeping head unit from going complete shutdown and keep in sleep mode while ignition is off.
How much current draw did it have in sleep mode? Any negative effect?

It would be the best if I head measured current draw before hooking up the radio, but I did not think about that at the time. I don't want to cut the wire again if I don't have to (meaning someone else has measured already. :D )
 

Streetking21

Senior Member
May 9, 2009
122
29
I didn't measure it myself but yesterday I read a post regarding the power consumption while on, sleeping and off. It was 1.2A (~14-15W) while sleeping which is ****ing ridiculous imho but could be the explanation why there isn't an option to keep the device sleeping longer than 2 hours. Given that consumption while sleeping, your battery would be probably dead in less than 3 days of standby time.
 

lambition

Senior Member
Mar 22, 2010
175
18
I didn't measure it myself but yesterday I read a post regarding the power consumption while on, sleeping and off. It was 1.2A (~14-15W) while sleeping which is ****ing ridiculous imho but could be the explanation why there isn't an option to keep the device sleeping longer than 2 hours. Given that consumption while sleeping, your battery would be probably dead in less than 3 days of standby time.

Wow. That is pretty high. Hardly in a sleep state.
 

morgish

Member
Sep 18, 2016
40
5
I didn't measure it myself but yesterday I read a post regarding the power consumption while on, sleeping and off. It was 1.2A (~14-15W) while sleeping which is ****ing ridiculous imho but could be the explanation why there isn't an option to keep the device sleeping longer than 2 hours. Given that consumption while sleeping, your battery would be probably dead in less than 3 days of standby time.

Surely not?
 

doitright

Senior Member
Oct 31, 2014
1,512
861
I didn't measure it myself but yesterday I read a post regarding the power consumption while on, sleeping and off. It was 1.2A (~14-15W) while sleeping which is ****ing ridiculous imho but could be the explanation why there isn't an option to keep the device sleeping longer than 2 hours. Given that consumption while sleeping, your battery would be probably dead in less than 3 days of standby time.

Attribute that to "made in china". With just a little bit more thought, they could have designed the MCU board to shut down completely while putting the CPU into deep sleep, and end up with a sleep/standby mode that consumes negligible power.

I.e., it shouldn't use any more power than a half-decent TABLET does in sleep mode with the wifi turned off. My Nexus 9 will standby for a couple of MONTHS like that, and its battery is a very small fraction of a car battery.
 

Streetking21

Senior Member
May 9, 2009
122
29
I did measure the power consumption in sleep mode before I installed my Joying in my car.
Result: 350-450 mA

Thanks for the info.

---

I wouldn't feel comfortable with a sleep time of 24h+. Lets say its 400mA and you use your car on a daily basis. Thats 24h*400mA = 9.6Ah. I am not an expert when it comes to car batteries but I read somewhere that if the battery capacity drops lower than 50 or 60% the starter has a hard time, especially with the colder temperatures ahead (at least here). And you have to consider that the older the battery the less capacity. I wouldn't test it out myself but I would be very interested in someone doing it nonetheless ;)
 

dkintana

Member
Apr 25, 2008
28
0
I did measure the power consumption in sleep mode before I installed my Joying in my car.
Result: 350-450 mA

500mA is a little high to left in that state for a long period of time. 500mA is the current that drain one car lamp of 5W, like the ones on the rear, the tiny ones on the front, or the ones used in the passenger compartment. With a good battery there should be no problem for letting it in that state for a day or so, but for an old battery this could dry your battery in a few hours.
However, i agree with the fact that the time for going to shutdown should be user selectable.
 

bilaliz

Senior Member
Dec 31, 2009
82
10
i was thinking of the same thing, now i am completely ignorant of the electornics side of it, but isnt this something the devs here can take on to fix from the software side of things, i.e keeping only the CPU in deepsleep and shutting everything else down?
 

dkintana

Member
Apr 25, 2008
28
0
It's necessary to keep in mind that these HUs are not like tablets. These HUs has more electronic inside of them: MCU, sound ampliffier and, surely, some more electronics. All of them drain current, and not all of them are capable of getting in a low power mode like CPUs do.

---------- Post added at 12:49 PM ---------- Previous post was at 11:50 AM ----------

Hi! I think I've found the solution!
In my HU, Erisin 3015V, I go to settings and just below "GPS" option, there is another option that says "Extension configuration" (Or something like this, just because my unit is in what chinese people think is spanish...) and into this option there are three ones, the first of them says something like "Delay when acc is shutdown", and this option has several values. The first time was selected 30seconds, and the HU Always made a cold boot. Then I adjusted it to the max, 2 hours, and now the unit has warm booted after more than 1 hour of beeing slept.
Try you and update, please... I think that 2 hours is enough for most situations.
 

Streetking21

Senior Member
May 9, 2009
122
29
in which way is this a solution?
2 hours is the current maximum for all headunits I know and it is not a secret or hidden option, but this thread is about keeping the unit in sleep mode for a longer period of time than the 2 hours. (no offense)
 

hurtgen

Member
Nov 11, 2016
9
1
prolly not much of a problem for me in. 08 duramax with dual deep cycle batteries.

on another thought, you people with standard cars with standard starting batteries... you COULD install a second battery. a deep cycle battery. run HU off it. isolate it from charging system while vehicle is off. automatically reconnect to charging system with a relay of some sort when vehicle is on. this way you NEVER stand the chance to drain your starting battery. and as its a deep cycle, draining it down empty doesnt damage it unlike starting batteries. i wouldnt even worry about it anyway because it would prolly take like 12 months to drain a decent deep cycle down. lol
 

Streetking21

Senior Member
May 9, 2009
122
29
i wouldnt even worry about it anyway because it would prolly take like 12 months to drain a decent deep cycle down. lol

whats the math behind this calculation?
12 months = 365 days = 8,760 hours
8,760h x 0.4A (consumption of the head unit while in sleep mode) = 3,504 Ah
Show me that car battery and I will give you a cookie ;)

Thought of the second battery myself. In general, I think thats a viable option but there are some downsides as well. The generator has to be very powerful to load two batteries at once or you even have to add additional relays to prioritize the main/starter battery. Of course that problem depends on wether your primary trip range is short or long. This should work if you are driving on a daily basis or at least every second day for 30-40 minutes I guess.

Lets say you install a deep cycle battery with 80Ah and it is fully charged, the theoretical standby time is a bit more than a week (ofc that could be enough for some people):
80Ah / 0.4A = 200h = 8.3 days (just the theory)

As I dont know much about deep cycle batteries I will cite from wikipedia:
A deep-cycle battery is designed to discharge between 45% and 75% of its capacity, depending on the manufacturer and the construction of the battery. Although these batteries can be cycled down to 20% charge, the best lifespan vs cost method is to keep the average cycle at about 45% discharge

Long story short, you wont get 8.3 days from a 80Ah deep cycle battery. If you are fine with the reduced life span, its around 160 hours (6.6 days) and if you follow the manufacturers recommendation you will probably get around 4-5 days.

I am not trying to work against you here, but I dont know if thats really worth the trouble (costs & installation). Thank you for your input anyway.
 
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hurtgen

Member
Nov 11, 2016
9
1
Hmm. My truck runs dual AC Delco 48PG's. It appears each are 70 amp hour.

Here's a couple other options that come to mind.

1. Most viable and affordable in my opinion. Wire up an easy attach Battery Tender. I have this set up on my motorcycle. When I roll in to the garage after a ride, I mismount, attach battery tender, and my small motorcycle battery receives a small trickle charge until next time I ride. Also, do Not use the cheap battery chargers. Spend the extra 10 bucks and get a smart charger. This thing works awesome! I pull all my batteries from vehicles not used during winter and bring them in to the house and have BT on them. If your unfamiliar with these, definitely check it out.

2. Perhaps some sort of small and efficient solar panel that can not only keep up with HU discharge, but enough to also overcome parasitic waste from all other systems as well? Not sure if this is viable. I don't know anything about solar panels. Just throwing it out there
 

ProfEngr

Senior Member
Aug 25, 2009
601
56
The only issue I have with the battery tender option is... what happens when the user forgets to unplug it before driving off? Other than that it's not a bad idea. There definitely needs to be some thought put into low power modes. I used to hotwire my HU's so that I didn't have to listen to the key-minder on my older vehicles. Difference is that those non-advanced HU's had a real "off" mode even with the ACC wire hot all the time.

The solar panel option would work well for those that park outside and have decent sunlight during the day.
 

Tabs78

Senior Member
Dec 8, 2007
645
25
Hi Sorry for my english.
I have a problem.
My head unit often doesn't shutdown after suspend mode.
Maybe 50â„… times works correctly.
Another 50â„… i switch off engine, radio goes in suspend mode ( Black screen and not respond pressing button) but if i switch on engine after the suspend time ( i set 30second but it is so also 20 minutes) the head unit is already on homescreen without reload the s.o.



Inviato dal mio MI 5s Plus utilizzando Tapatalk
 

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  • 1
    I did measure the power consumption in sleep mode before I installed my Joying in my car.
    Result: 350-450 mA
    1
    i wouldnt even worry about it anyway because it would prolly take like 12 months to drain a decent deep cycle down. lol

    whats the math behind this calculation?
    12 months = 365 days = 8,760 hours
    8,760h x 0.4A (consumption of the head unit while in sleep mode) = 3,504 Ah
    Show me that car battery and I will give you a cookie ;)

    Thought of the second battery myself. In general, I think thats a viable option but there are some downsides as well. The generator has to be very powerful to load two batteries at once or you even have to add additional relays to prioritize the main/starter battery. Of course that problem depends on wether your primary trip range is short or long. This should work if you are driving on a daily basis or at least every second day for 30-40 minutes I guess.

    Lets say you install a deep cycle battery with 80Ah and it is fully charged, the theoretical standby time is a bit more than a week (ofc that could be enough for some people):
    80Ah / 0.4A = 200h = 8.3 days (just the theory)

    As I dont know much about deep cycle batteries I will cite from wikipedia:
    A deep-cycle battery is designed to discharge between 45% and 75% of its capacity, depending on the manufacturer and the construction of the battery. Although these batteries can be cycled down to 20% charge, the best lifespan vs cost method is to keep the average cycle at about 45% discharge

    Long story short, you wont get 8.3 days from a 80Ah deep cycle battery. If you are fine with the reduced life span, its around 160 hours (6.6 days) and if you follow the manufacturers recommendation you will probably get around 4-5 days.

    I am not trying to work against you here, but I dont know if thats really worth the trouble (costs & installation). Thank you for your input anyway.
    1
    I see.. the problem was;

    Settings / Car / Sleep after ACC OFF was set to auto (after MCU change from LM to HA)

    When i set to an actual value, i.e. 5min it is now doing what i want i.e. shutting down completely. thanks
    1
    I am currently using;

    HA_PX5_8.0_ota(20190428).zip & MTCE_HA_V3.40.zip

    I originally switched around MTCE_HA_V3.01.zip