Continued Tests of the 3 Battery System

[Satyam108]

Is this the meter?

Great job, Luc! And commendably keeping your thread on track. Thanks to Turion, Cifta, and BroMikey for contributing politely, refereeing, and playing nice, respectively . . . .and with respect.

This looks to be the meter you're using Luc?
https://www.ebay.com/itm/DC-20A-7-10...-/271952144643
$11.99 with free shipping from KY

[gotoluc]

Luc,
Not quite as much time as you are taking to test it though. It takes FOREVER to do that. And so dang tedious!

You might take a look at the video you made at 3:55 on day one. You didn't measure the voltage on battery 3, so the voltage I put on the chart is my best guess based on what is shown in the video. If I need to change that, let me know.

Dave

I'm sure the voltage reading from the Watt meter should be fine as there's not much difference between each meter.

Kind regards

Luc

[gotoluc]

Great job, Luc! And commendably keeping your thread on track. Thanks to Turion, Cifta, and BroMikey for contributing politely, refereeing, and playing nice, respectively . . . .and with respect.

This looks to be the meter you're using Luc?
https://www.ebay.com/itm/DC-20A-7-10...-/271952144643
$11.99 with free shipping from KY

Thanks Satyam108

Yes, that is the meter and at a good price for US residents.

Kind regards

Luc

[gotoluc]

I accept your apology BroMikey and glad you now see my intentions are good.

Kind regards

Luc

[gotoluc]

11/2/17 (4th day) 20th bat switch

Link to video: https://youtu.be/FfVDCSWDzGk

[gotoluc]

That's great Dave!... glad the test is looking promising

Regards

Luc

[gotoluc]

11/2/17 (4th day) 21st bat switch

Link to video: https://youtu.be/MsgvhZww0Fc

[gotoluc]

I wonder how much power those three meters consume running the entire time the test is running? It might not be much but it is certainly something.

Yes, I though of that as well. To power one meter it uses 0.00091 Amp @ 12vdc and 0.00134 Amp @ 24 vdc
Luckily the lab space I have free use of has a high end meter I can measure microamps with precision.
Like you said, it's not much but it's good to know and factor in if you wish.

Regards

Luc

[gotoluc]

11/2/17 (4th day) 22nd bat switch

Link to video: https://youtu.be/fIXUuAHkpSQ

[BroMikey]

I wonder how much power those three meters
consume running the entire time the test is running? It might not be
much but it is certainly something.

yes you are right Dave this value could be added into the chart.

Here is a quote from a RC site on shunts as all measuring devices such
as shown in Luc's video's use built in ones. The one's Luc is using has
more functions for even smaller amounts to measure that drives the cost
up. I think DROK is one brand name if you wish.

For our purposes we only need the ma scale but either device whether
cheap or expensive carries an internal shunt. This is simple Ohm's Law
math if you want to calculate it out.

The built in shunt on the meter i am buying off of ebay

https://www.ebay.com/itm/AC-80-260V-20-50-100A-DC-6-5-100V-LCD-Digital-Display-Volt-Amp-Power-Watt-Meter/172621629117?hash=item28310d06bd:m:mqoXQnuea95tb0S E9664FSg

is lower at 20 amp size. They also talk about drift and calibration here.

it appears that what use to cost hundreds of dollars is now produced
for a fraction of that cost and is common place. Anyone can afford these.

According to all of the new standards you are looking at .002%+or-

i remember John Bedini use to harp on not using amp shunts with
his radiant chargers as they were all pulsing and surging constantly
and since he was working with a COP of 1.3 it was critical to keep
losses way down. Pulsing is another story, losses go higher.


http://www.rc-electronics-usa.com/current-shunt.html



Ohm's law:

V = I × R

states that the Voltage (V in Volts) across a resistance
(R in Ohms) is the product of the resistance and the current
I in Amps) flowing through the resistance.

For example. A current shunt whose resistance is 0.001 Ohms
having a current of 50 Amps flowing through it will produce a voltage
of 0.001 ×50 = 0.05 Volts or 50 mV (milliVolts).

So by inserting a current shunt into a circuit whose current you
want to measure your can find the current by measuring the voltage
drop across the shunt. Then knowing the resistance of the current
shunt you can calculate the current using Ohm's law arranged
as I = V ÷ R.

Conversely, if you know the current and the voltage produced
across a current shunt you can use Ohm's law to calibrate the
current shunt resistance.

[gotoluc]

Yes, I though of that as well. To power one meter it uses 0.00091 Amp @ 12vdc and 0.00134 Amp @ 24 vdc
Luckily the lab space I have free use of has a high end meter I can measure microamps with precision.
Like you said, it's not much but it's good to know and factor in if you wish.

Regards

Luc

Dave, the current measurement I provided you is only the current consumption of the Watt Meters circuit and LCD. It does not include what is dissipated in the Meters Shunt resistor which is either 0.001 Ohm or at most 0.01 Ohm

Regards

Luc

[gotoluc]

11/2/17 (4th day) 23rd bat switch

Link to video: https://youtu.be/IDv5j6YQo5Q

[gotoluc]

11/2/17 (4th day) stopped for the night at 1:15 am

Link to video: https://youtu.be/cGa9Z4Bj5L4

[Satyam108]

34.69

I am REALLY looking forward to the last test tonight, and here's the data so you can see why.

I'm going to put two columns of figures here. they are the last 7 tests. I totaled the voltage in the three batteries each time

35.22..........35.6
35.45..........35.52
34.12 ..........35.02
34.87

In each of these instances There is a low total followed by a HIGHER total. I have a feeling that ONE battery out of the 3 is not doing so well at taking a charge, just from what I see here. There is ONE weird number. But in all THREE of the complete pairs, the end number is higher than the BEGINNING number.

I get 34.69 Dave

[gotoluc]

Test resumed 11/3/17 (5th day) 24th bat switch

Link to video: https://youtu.be/ggSUcI70j-E