[EVDL] pumping the amperes, replies

[fred via EV]

Cor van de Water, I'm not so good at keeping track of hacks I've done in the 
past. I'd been aiming at a nearly "turn it on and walk away" sort of solution. 
It seems that the Revolectrix answer is a good one for that objective.

There's only two EVs remaining in our fleet that are suited for on-board 
monitoring that's not part of the computer system. One is a ride-on lawn mower 
and the other is my Gizmo. Both have a CycleAnalyst, a splendid device for 
keeping track of consumption of those critical ampere-hours. I'm pretty sure I 
have a high-current shunt in the Gizmo, as the controller is rated to 400 amps 
and I usually run in the hundred range, maxing out near 200 on occasion. The 
pack is rated 3C and I'll never call for 540 amperes!

David Roden, as noted in a later message, I desired to locate a full-featured 
device, and of course, a price to match! I also have had horrible luck with 
small digital ammeters sourced from China. Most recently, tested with a 
calibrated power supply, the 0 - 50 ma digital meter was approximately 20% off, 
especially at the low end where I needed the best information. For some things, 
analog is the best. This time, not so much though.

Matt Lacey, it's great to hear from another user of something I am likely to 
purchase, especially as you present yourself as a satisfied user. One of the 
earlier devices I had for my early fleet of EVs was somewhat unstable and it 
was said that if one connected a laptop, one could be assured of cooking at the 
very least a USB port, and at worst, the entire mainboard. I did not laptop 
that device, to be sure.

I suppose I'm being "internet impatient" as I've not heard back from the 
Revolectrix people. After all, I emailed them just this morning!

fred
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Re: [EVDL] Pumping the amperes?

[Lee Hart via EV]

From: Cor van de Water via EV 
>Maybe you can trick your charger by adding a second resistor of the same
>value parallel to the original for current measurement,
>so the current measurement shows half the actual current
>and then configure your charger to charge and discharge at half the max
>value so that now the 100Ah limit is actually 200Ah

I have an MRC-989 battery charger/discharger/tester with this same problem. 
When it worked, it worked fine. But the quality was so low that it failed 
several times. After the 4th time, I haven't bothered to fix it.

It doesn't have a proper shunt to measure current; there's just a trace on the 
PC board, which they apparently coated parts of it with solder to "calibrate" 
it. I could add more solder or wire to change its calibrataion; but the rest of 
the meter wasn't really adequate for extended testing at high current anyway. 
The power supply would overheat, or the heatsink for the regulator, etc.

Fred, do you have an E-meter / Link-10 / Link-Lite / Link-Pro or similar meter? 
You really should get one for your EV to know what's going on with your 
batteries. Once you have it, you can use it to test your individual batteries 
at currents up to 500a and amphours up to 2000ah.
 

--
Excellence does not require perfection. -- Henry James
--
Lee A. Hart http://www.sunrise-ev.com
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Re: [EVDL] Pumping the amperes?

[Matt Lacey via EV]

I use one of those testers on my batteries.  it's the best, hook it up to a 
laptop and the possibilities are endless. 
Pretty sure you can parallel for higher power levels,  of say you needed to do 
a power test on many larger cells

⁣Sent from BlueMail ​

On 27 Jul 2017 00:25, at 00:25, fred via EV  wrote:
>Boy, Howdy! That's a powerhouse! It certainly appears to have the
>capacity as well as all the features I'll need and then some. I've put
>a query to the USA operator to determine the best cabling combination,
>especially if it saves me a few american dollars overall. It looks like
>it would do just as good a job on my lead-acid dust collectors,
>although I just realized that my other R/C charger does have sufficient
>capacity to handle those.
>Thanks for the great lead.
>
>
>On Wednesday, July 26, 2017, 10:58:10 AM EDT, ROBERT
> wrote:
>
>
>This battery tester may do the job. 
>
>
>http://www.revolectrix.com/pl8_specs_tab.htm
>
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Re: [EVDL] Pumping the amperes?

[ROBERT via EV]

This battery tester may do the job.

http://www.revolectrix.com/pl8_specs_tab.htm

[http://www.revolectrix.com/images/PL8EC5.fea.jpg]<http://www.revolectrix.com/pl8_specs_tab.htm>

Revolectrix<http://www.revolectrix.com/pl8_specs_tab.htm>
www.revolectrix.com
For Battery types: Lithium Polymer (1s to 8s balanced, 1s to 2s unbalanced), 
Lithium Ion (1s to 8s balanced, 1s to 2s unbalanced), Lithium Manganese (1s to 
8s ...





From: EV <ev-boun...@lists.evdl.org> on behalf of fred via EV 
<ev@lists.evdl.org>
Sent: Tuesday, July 25, 2017 3:26 PM
To: via EV
Subject: [EVDL] Pumping the amperes?

I've searched the world (wide web) over, but haven't been able to pin down the 
correct specifics to accomplish my goal. I'm hoping someone here has that 
valuable commodity known as experience and can better advise and/or direct me.
I have 180AH LiFePO4 cells that I want to test over an extended period of time. 
I have an R/C class charger unit, almost perfect for my requirements, but it 
tops out at 100AH on the charge sequence. It also "bottoms out" at the same 
value on the discharge sequence. It's exactly what I need, a device to cycle 
the batteries, measuring the energy in both directions, but for the 100AH limit.
Does anyone have suggestions regarding a more suitable device? Even in the R/C 
world, the limits are so low, but also not something easily found in searches.
Suggestions for search terms would be useful too!
thanksfred
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Re: [EVDL] Pumping the amperes?

[fred via EV]

Boy, Howdy! That's a powerhouse! It certainly appears to have the capacity as 
well as all the features I'll need and then some. I've put a query to the USA 
operator to determine the best cabling combination, especially if it saves me a 
few american dollars overall. It looks like it would do just as good a job on 
my lead-acid dust collectors, although I just realized that my other R/C 
charger does have sufficient capacity to handle those.
Thanks for the great lead.


On Wednesday, July 26, 2017, 10:58:10 AM EDT, ROBERT  wrote:


This battery tester may do the job. 


http://www.revolectrix.com/pl8_specs_tab.htm

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Re: [EVDL] Pumping the amperes?

[Cor van de Water via EV]

Hi David,
That is only a meter,
the OP's problem is that his charger/discharger will switch off after
100Ah
while his cells have 180Ah capacity, so he can't properly cycle a cell.
Cor.

-Original Message-
From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of EVDL
Administrator via EV
Sent: Wednesday, July 26, 2017 1:27 AM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Pumping the amperes?

Maybe something like Ebay 122047896993 ?

Claims "Ah Measuring range 0 ~ 2000KAH"!

It's certainly cheap enough.  Accuracy?  Reliability?  Who knows?

Disclaimer: I know nothing about this gadget, just what I read in the
Ebay listing.

Also: you don't always get what you pay for, but you seldom get what you
don't pay for.

David Roden - Akron, Ohio, USA
EVDL Administrator

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Re: [EVDL] Pumping the amperes?

[EVDL Administrator via EV]

Maybe something like Ebay 122047896993 ?

Claims "Ah Measuring range 0 ~ 2000KAH"!

It's certainly cheap enough.  Accuracy?  Reliability?  Who knows?

Disclaimer: I know nothing about this gadget, just what I read in the Ebay 
listing.

Also: you don't always get what you pay for, but you seldom get what you 
don't pay for.

David Roden - Akron, Ohio, USA
EVDL Administrator

= = = = = = = = = = = = = = = = = = = = = = = = = = = = =
EVDL Information: http://www.evdl.org/help/
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = 
Note: mail sent to "evpost" and "etpost" addresses will not 
reach me.  To send a private message, please obtain my 
email address from the webpage http://www.evdl.org/help/ .
= = = = = = = = = = = = = = = = = = = = = = = = = = = = =


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Re: [EVDL] Pumping the amperes?

[Cor van de Water via EV]

Hi Fred,
Maybe you can trick your charger by adding a second resistor of the same
value parallel to the original for current measurement,
so the current measurement shows half the actual current
and then configure your charger to charge and discharge at half the max
value so that now the 100Ah limit is actually 200Ah
It remains a hack, and you will need to carefully document the halved
current indication to avoid overloading your charger...
Cor

-Original Message-
From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of fred via EV
Sent: Tuesday, July 25, 2017 3:27 PM
To: via EV
Subject: [EVDL] Pumping the amperes?

I've searched the world (wide web) over, but haven't been able to pin
down the correct specifics to accomplish my goal. I'm hoping someone
here has that valuable commodity known as experience and can better
advise and/or direct me.
I have 180AH LiFePO4 cells that I want to test over an extended period
of time. I have an R/C class charger unit, almost perfect for my
requirements, but it tops out at 100AH on the charge sequence. It also
"bottoms out" at the same value on the discharge sequence. It's exactly
what I need, a device to cycle the batteries, measuring the energy in
both directions, but for the 100AH limit.
Does anyone have suggestions regarding a more suitable device? Even in
the R/C world, the limits are so low, but also not something easily
found in searches.
Suggestions for search terms would be useful too!
thanksfred
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[EVDL] Pumping the amperes?

[fred via EV]

I've searched the world (wide web) over, but haven't been able to pin down the 
correct specifics to accomplish my goal. I'm hoping someone here has that 
valuable commodity known as experience and can better advise and/or direct me.
I have 180AH LiFePO4 cells that I want to test over an extended period of time. 
I have an R/C class charger unit, almost perfect for my requirements, but it 
tops out at 100AH on the charge sequence. It also "bottoms out" at the same 
value on the discharge sequence. It's exactly what I need, a device to cycle 
the batteries, measuring the energy in both directions, but for the 100AH limit.
Does anyone have suggestions regarding a more suitable device? Even in the R/C 
world, the limits are so low, but also not something easily found in searches.
Suggestions for search terms would be useful too!
thanksfred
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