Author Topic: Friends and your projects  (Read 4064 times)

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Offline HowdyPartner

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Re: Friends and your projects
« Reply #25 on: October 06, 2021, 08:09:42 am »
Hang on a minute... this Chinese "protection" device draws 80mA from the battery, all the time? And it's meant to stop the battery going flat?

I've had a faulty dashcam drawing 80mA at all times. The car wouldn't start after sitting in the garage for a week with that standby consumption.
 

Offline AaronLee

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Re: Friends and your projects
« Reply #26 on: October 06, 2021, 08:20:01 am »
Hang on a minute... this Chinese "protection" device draws 80mA from the battery, all the time? And it's meant to stop the battery going flat?

I've had a faulty dashcam drawing 80mA at all times. The car wouldn't start after sitting in the garage for a week with that standby consumption.

Faulty meaning a bad component, or faulty by design? I have experience in dealing with engineers designing automotive gear, and most of them realize the importance of minimizing current consumption, but it takes a LOT of additional work to do it right, and a lot of them are willing to take shortcuts to meet deadlines. If I was buying something (not just automotive stuff) where current consumption was important, I'd check the device compared to the spec first thing, and return it if it didn't meet spec. I'm willing to bet there's a lot more stuff out there that doesn't meet spec than most people realize.
 

Offline jonovid

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Re: Friends and your projects
« Reply #27 on: October 06, 2021, 08:42:14 am »
IMO if you do not have a spare unit or gadget then and there for an on the spot sale then the answer is No!
as saying Yes will cost you time and frustration.  people do change his or her minds then google it and find a new toy online. 
if your in business to sell gadgets of this type then your prepared for on the spot sales wen needed.  with a return policy for unwanted merchandise from impulse buying.



a true Friend can take a NO for an answer
« Last Edit: October 06, 2021, 08:56:38 am by jonovid »
Hobbyist with a basic knowledge of electronics
 

Online AndyC_772

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Re: Friends and your projects
« Reply #28 on: October 06, 2021, 08:53:06 am »
They're probably compelled to take short cuts in order to meet cost targets.

A lot of my jobs are automotive accessories; I do consulting work for a number of businesses who make and sell products that have a permanent conection directly to a vehicle supply.

Because of the quantity and/or price point, they're all highly cost sensitive. Components that don't directly impact the spec sheet or user experience (eg. protection or supply switching) are the first to be questioned. Engineers don't always have the confidence to stand up and insist that they really are essential, even though the customer will complain the moment the device drains their battery or blows up a month after they've installed it otherwise.

Offline WilkseyTopic starter

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Re: Friends and your projects
« Reply #29 on: October 06, 2021, 09:31:02 am »
Yes, 80mA, the one I had to hand was 16mA, I have about 50 of these relays over from another project and just decided to use it, I use my car every day so I am not worried about such a small draw, it has a massive battery and while it is only rated at 95Ah the voltage seems stable, I am going away for a week soon so I will see what it does to the battery whilst I am away.
 

Offline HowdyPartner

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Re: Friends and your projects
« Reply #30 on: October 06, 2021, 10:36:41 am »
Quote
Faulty meaning a bad component, or faulty by design?
Can not tell, unfortunately. My guess is that the battery has died and it was trying to charge it up all the time.

The point is that 80 mA of standby current is way too much for a car accessory.
« Last Edit: October 06, 2021, 06:13:31 pm by HowdyPartner »
 

Offline WilkseyTopic starter

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Re: Friends and your projects
« Reply #31 on: October 06, 2021, 04:56:04 pm »
I have seen people state that an acceptable overall drain is between 50 - 100mA, but I can do the battery calcs and I guess if the car is not left for too long that will be OK, not something i'd like to "guarantee" though.
 

Online AndyC_772

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Re: Friends and your projects
« Reply #32 on: October 06, 2021, 05:09:48 pm »
These "people" were not informed, reliable sources. Personally I work to the rule of thumb that no automotive device should draw more than 0.5mA continuously on standby, preferably an order of magnitude less.

Remember, this device you've built is supposed to prevent your battery from going flat.

Offline james_s

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Re: Friends and your projects
« Reply #33 on: October 06, 2021, 05:13:54 pm »
My car regularly sits parked for a week or more between uses so it would be a problem if something was drawing 50mA. IMO a car needs to be able to sit for at least 3 months without the battery going flat to not be a pain.
 

Offline WilkseyTopic starter

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Re: Friends and your projects
« Reply #34 on: October 07, 2021, 12:19:51 am »
Perhaps someone should tell the manufacturers, this chap measured a bit higher than 50mA being drawn.
 

Offline PlainName

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Re: Friends and your projects
« Reply #35 on: October 10, 2021, 06:55:43 pm »
Quote
this chap

Could've written in two paragraphs what he spent 20 minutes trying to say, and I could have skimmed that in 10 seconds to find the relevant detail. As it is, I gave up after 2:50 (which I will never get back).
 

Offline AaronLee

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Re: Friends and your projects
« Reply #36 on: October 11, 2021, 01:12:07 am »
Quote
this chap

Could've written in two paragraphs what he spent 20 minutes trying to say, and I could have skimmed that in 10 seconds to find the relevant detail. As it is, I gave up after 2:50 (which I will never get back).

This isn't the Pet-Peeve thread, but that's one of my huge pet-peeves - videos that go on and on in order to tell you something they could have in 1/100th the time. It's one of the main reasons that when searching for information I'll generally first click on links that look like they're text based rather than video based. Good thing I didn't bother to click on the video.
 
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Offline Ed.Kloonk

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Re: Friends and your projects
« Reply #37 on: October 11, 2021, 02:05:31 am »
Quote
this chap

Could've written in two paragraphs what he spent 20 minutes trying to say, and I could have skimmed that in 10 seconds to find the relevant detail. As it is, I gave up after 2:50 (which I will never get back).

This isn't the Pet-Peeve thread, but that's one of my huge pet-peeves - videos that go on and on in order to tell you something they could have in 1/100th the time. It's one of the main reasons that when searching for information I'll generally first click on links that look like they're text based rather than video based. Good thing I didn't bother to click on the video.
If the title looks fishy and as murky as they often are, I sometimes head straight for a video's comment section and just read a few posts before starting the vid. The beauty of the youtube algo is the majority of peeps are arguing about the meat of the matter and it's among the top comments. I can't be the only one who does this and I wonder how long until you wont be able to see the comments before you watch the preroll and have had watched a certain amount of video.
« Last Edit: October 11, 2021, 02:07:17 am by Ed.Kloonk »
iratus parum formica
 
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