Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
LiitoKala Voltage reading wrong by -0.30V
#11
(07-22-2019, 01:55 AM)Geek Wrote:
(07-19-2019, 12:31 PM)barns Wrote: I appreciate the MM concerns but that's not the issue.

There are reasons why most would jump to the conclusion of your MM. 

It’s a classic case of MM denial… I’ve suffered though it for years.  I now have at least 4-5 meters just to make sure my others are not lying to me.
Geek likes this post
Reply
#12
(07-22-2019, 06:21 PM)Crimp Daddy Wrote: It’s a classic case of MM denial… I’ve suffered though it for years.  I now have at least 4-5 meters just to make sure my others are not lying to me.

Yep I've had my share of MM doubt till I bought 2 things well 4 things actually

1. A Voltage reference unit and a resistor reference.


2. A decent Bench MM. well 2.

Big Grin Big Grin Big Grin
Wolf
Geek likes this post
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 8/7/2019
Total Number of Cells Recorded and processed                 6106
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2694
For Info Google Drive
Not your average Wolf       
            Cool
Reply
#13
(07-22-2019, 07:16 PM)Wolf Wrote:
(07-22-2019, 06:21 PM)Crimp Daddy Wrote: It’s a classic case of MM denial… I’ve suffered though it for years.  I now have at least 4-5 meters just to make sure my others are not lying to me.

Yep I've had my share of MM doubt till I bought 2 things well 4 things actually

1. A Voltage reference unit and a resistor reference.


2. A decent Bench MM. well 2.

Big Grin Big Grin Big Grin
Wolf

Nice toys. Don't have the budget for those unfortunately. Where'd you get the Voltage reference unit? 

I've got 8x INA219 sensors for my DIY charger/discharger project. I hope the readings from those will be good enough to confirm that my MM and Opus are not that broken.
Reply
#14
(08-01-2019, 09:04 AM)barns Wrote: Nice toys. Don't have the budget for those unfortunately. Where'd you get the Voltage reference unit? 

I've got 8x INA219 sensors for my DIY charger/discharger project. I hope the readings from those will be good enough to confirm that my MM and Opus are not that broken.

Voltage reference unit. AD548

https://www.amazon.com/gp/product/B00NL4...UTF8&psc=1

Just google AD548 and you will find many variation to it.

The INA219 ar good little units. They have their own internal reference V I believe.
Just got to write the sketch and still do the calculations and as I have found out with V dividers and even the ADS1015 and/or the ADS1115.
Still had to do some offset calculations. So having the fluke meters helps.
You can occasionally find a good deal on a decent bench MM for under $100 on ebay.

Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 8/7/2019
Total Number of Cells Recorded and processed                 6106
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2694
For Info Google Drive
Not your average Wolf       
            Cool
Reply
#15
(08-01-2019, 12:54 PM)Wolf Wrote: Voltage reference unit. AD548

https://www.amazon.com/gp/product/B00NL4...UTF8&psc=1

Just google AD548 and you will find many variation to it.

Have you tried the AD584? AD548 does not seem to be for sale on my country's online shops. I found similar looking builds but marked as AD584.
Reply
#16
(08-01-2019, 02:17 PM)barns Wrote: Have you tried the AD584? AD548 does not seem to be for sale on my country's online shops. I found similar looking builds but marked as AD584.

The AD584 seems to be the same idea.

http://s.click.aliexpress.com/e/bzvz0SoY /> Just the numbers are different Huh

Wolf
Reply
#17
(07-18-2019, 11:47 AM)barns Wrote:
(07-18-2019, 12:03 AM)Crimp Daddy Wrote: Sounds like its ready for the trash bin...  those testers dont last forever, I have lost a couple to heavy use.  Once they start acting up I retire the unit.

Oh boy, it's only 8 months old and have tested less than 200 cells.

Donate it to me for repair?
No. cells
Indexed: 53
Processed ok, not yet indexed: ~1500
Broken down, untested: ~800
Not yet broken down: ~140 kg
Reply
#18
(07-22-2019, 01:55 AM)Geek Wrote:
(07-19-2019, 12:31 PM)barns Wrote: I appreciate the MM concerns but that's not the issue.

There are reasons why most would jump to the conclusion of your MM. I'm not certain, but I don't really think an 18650 could even hold 4.55v. I sure wouldn't even like to test it. I imagine somewhere around 4.3-4.4v it would just start burning off the charge as heat. The cell most assuredly would be hot when removed from the charger. It would most likely trigger the CID.

If you were sure that a cell actually hit 4.55v, I would discharge and bin it. The useful life has most likely been cooked out of it. I would definitely handle with care, as it most likely will have some pressure built up inside.


are you sure????

I think pretty much every cell will go to 5V.

wouldn't want to do it by accident.  and I don't do it on purpose.  but I've found cells dumped from 'harvesters' (shame!) at this SoC.. it's not the end of the world ... but definitely out of spec.
--    ----    ----    ----    ----    ----    ----    ----    ----    ----    --
all systems nominal... rock on.
-----------------------------------------------------------------------
Reply
#19
Btw the overcharged cells are https://secondlifestorage.com/t-LG-LGABD...ifications and https://secondlifestorage.com/t-LG-LGABC...ifications which has a max of 4.35v and 4.30v.

@winny
Donate it to me for repair?

Sorry, I'm from asia and shipping would probably cost 2x a brand new unit lol.
Reply
#20
(08-02-2019, 08:10 AM)DCkiwi Wrote:
(07-22-2019, 01:55 AM)Geek Wrote:
(07-19-2019, 12:31 PM)barns Wrote: I appreciate the MM concerns but that's not the issue.

There are reasons why most would jump to the conclusion of your MM. I'm not certain, but I don't really think an 18650 could even hold 4.55v. I sure wouldn't even like to test it. I imagine somewhere around 4.3-4.4v it would just start burning off the charge as heat. The cell most assuredly would be hot when removed from the charger. It would most likely trigger the CID.

If you were sure that a cell actually hit 4.55v, I would discharge and bin it. The useful life has most likely been cooked out of it. I would definitely handle with care, as it most likely will have some pressure built up inside.


are you sure????

I think pretty much every cell will go to 5V.

wouldn't want to do it by accident.  and I don't do it on purpose.  but I've found cells dumped from 'harvesters' (shame!) at this SoC.. it's not the end of the world ... but definitely out of spec.

I had a LiPo that I accidentally overcharged, LiHv setting - 4.35v instead of 4.2. It swelled up like a balloon. I don't know what voltage it hit, as I disconnected the charger immediately.
Reply


Who read this thread?
47 User(s) read this thread:
FrankEP (08-05-2019, 01:51 PM), Overmind (07-23-2019, 06:17 AM), barns (08-06-2019, 02:09 AM), kevinjaye (08-05-2019, 02:17 PM), ajw22 (07-18-2019, 06:37 PM), 5buBZMKeJZgapTGsbGzKf (07-22-2019, 10:41 PM), Wolf (08-11-2019, 01:03 PM), Beholder (07-18-2019, 12:23 PM), emuland-metroman (07-18-2019, 07:06 PM), WuggyBuggy (08-16-2019, 02:38 PM), winny (08-04-2019, 07:24 PM), Lucan (08-05-2019, 10:31 PM), Rubert (07-21-2019, 02:07 PM), a.ostojic (08-07-2019, 01:05 PM), LPG (08-01-2019, 01:51 PM), 3xtr3m3 (08-11-2019, 08:42 AM), Smolder (07-22-2019, 07:19 AM), solarsteve (07-19-2019, 05:43 PM), Saiya (07-22-2019, 02:46 PM), Tektiitti (08-05-2019, 02:58 PM), mbladen (07-28-2019, 10:13 PM), ben teker (07-25-2019, 10:14 PM), chuckp (08-11-2019, 09:50 PM), Riplash (08-11-2019, 05:19 PM), Walde (07-23-2019, 08:25 AM), Ivo Staelens (08-05-2019, 07:09 PM), Geek (08-12-2019, 12:41 AM), BlueSwordM (07-22-2019, 03:09 AM), Stefaan De Ridder (07-19-2019, 01:50 PM), watts-on (08-05-2019, 02:39 PM), Korishan (08-05-2019, 08:02 PM), mike (08-17-2019, 12:17 AM), Sean (08-05-2019, 02:47 PM), daromer (08-11-2019, 08:24 AM), DCkiwi (08-11-2019, 08:22 AM), Oz18650 (08-01-2019, 11:40 AM), djuro (08-05-2019, 04:02 PM), CBlack (07-19-2019, 02:07 AM), thunderheart (07-19-2019, 08:31 AM), Oliman (07-18-2019, 06:44 PM), Zvonko000 (07-22-2019, 08:33 PM), Ibiza (07-18-2019, 11:51 AM), Redpacket (08-11-2019, 08:37 AM), Crimp Daddy (08-12-2019, 03:51 PM), Dala (07-19-2019, 12:48 PM), Chablis_m (08-03-2019, 11:12 PM), hbpowerwall (07-23-2019, 07:52 PM)

Forum Jump:


Users browsing this thread: 1 Guest(s)