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Old Jun 14, 2009, 04:36 AM
Supersonic Engineering
GordonTarling's Avatar
UK, Greater London, Uxbridge
Joined Mar 2001
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Natterjak - it has been proven that balanced cells on the bench or during charging does not always equate to balanced cells when under load. It is quite possible to have one cell in a pack whose voltage collapses under load and you wouldn't always know about it immediately. This device will be very valuable, especially on the larger and more expensive packs.
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Old Jun 14, 2009, 08:13 AM
Proud to eat Kraut ;-)
Julez's Avatar
Germany
Joined Dec 2003
5,331 Posts
Thats the main point:

One can log how the cells behave with full load during the flight.

Also, there is the alarm (port).

I have a 20Ah 5s Lifepo pack as a field power supply.
Recently, I had a cell go south, which would have been a costly experience had it not been replaced under warranty.
When I connect the CellLog while using this battery, and I set the alarm levels to activate alarm when conspicuitys arise, this will be a great peace of mind.
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Old Jun 14, 2009, 10:20 AM
Asks too many questions
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Berkshire, UK
Joined Nov 2005
474 Posts
Thanks guys, you learn something every day!
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Old Jun 15, 2009, 03:30 AM
CamLight Systems
New York City, USA
Joined Oct 2003
1,172 Posts
Add my vote for a faster sampling rate!!!!

Once every 2 seconds is OK but once every 0.5 second, or even once a second, would make this device incredible useful for me. I have several applications for a logger that I could use this for but I need to record cell voltages under high current burst conditions, some only 2-3 seconds long.
Having multiple voltage samples during these bursts would be great.

Being able to log 36 hours of data is nice, but I'd gladly accept only an hour or two of logging in exchange for a faster sample rate.

Junsi, thanks for developing such a useful product!!!
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Old Jun 17, 2009, 02:34 AM
iCharger
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Joined Mar 2007
1,087 Posts
Quote:
Originally Posted by JohnMuchow
Add my vote for a faster sampling rate!!!!

Once every 2 seconds is OK but once every 0.5 second, or even once a second, would make this device incredible useful for me. I have several applications for a logger that I could use this for but I need to record cell voltages under high current burst conditions, some only 2-3 seconds long.
Having multiple voltage samples during these bursts would be great.
Hello John,

Thank you for your appreciation. We are trying to change it as adjustment item, whose sampling rate can be 0.5 second, 1 second, 2 seconds, but the detail we still need communicate with the guy of Logview.

Thanks again for your suggestion.

Regards,
Junsi
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Old Jun 17, 2009, 03:42 AM
CamLight Systems
New York City, USA
Joined Oct 2003
1,172 Posts
Thank you Junsi!
I'm looking forward to purchasing several units.
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Old Jun 17, 2009, 05:26 AM
Proud to eat Kraut ;-)
Julez's Avatar
Germany
Joined Dec 2003
5,331 Posts
Hi Junsi,

another suggestion from me.

As I use packs with different chemistries, it is a little inconvenient having to access the menu each time to choose the correct chemistry.

What about the following feature:
A different chemistry is chosen according to which button is pressed while the CellLog is connected.

When I press the top button and connect the pack, LiPo is chosen.
When I press the middle button and connect the pack, LiIo is chosen.
When I press the bottom button and connect the pack, LiFe is chosen.
When I do not press any button and connect the pack, everything stays the way it was before.

This would be more convenient, and would not require additional time.

Cheers,

Julez
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Old Jun 19, 2009, 01:48 AM
iCharger
junsi's Avatar
Joined Mar 2007
1,087 Posts
Quote:
Originally Posted by Julez
What about the following feature:
A different chemistry is chosen according to which button is pressed while the CellLog is connected.

When I press the top button and connect the pack, LiPo is chosen.
When I press the middle button and connect the pack, LiIo is chosen.
When I press the bottom button and connect the pack, LiFe is chosen.
When I do not press any button and connect the pack, everything stays the way it was before.

This would be more convenient, and would not require additional time.

Cheers,

Julez
Hello Julez,

Thank you for your great suggestion. We will take it into consideration.

Thanks again for your input.

Regards,
Junsi
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Old Jun 19, 2009, 03:17 AM
Registered User
Son, Norway
Joined Sep 2004
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Will the unit always draw power from the outermost wires only, so that the balance is not disturbed?

Fred
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Old Jun 19, 2009, 05:04 AM
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Dekker's Avatar
Delft, Netherlands
Joined Jul 2001
233 Posts
sampling rate

I am also very interested in this measuring tool, but I would also like to see a higher sampling rate, like max 4 measurements/sec.

If I order one now, will it be possible to change the sampling rate through a firmware update, or is it fixed in the hardware?
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Old Jun 19, 2009, 11:36 AM
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Delft, Netherlands
Joined Jul 2001
233 Posts
Another question:

Do you need the Balance Connector Conversion Board as mentioned in the manual or will the Cellog also take balancer connectors directly?
The conversion board seems huge and certainly will not fit in my heli together with the Cellog.
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Old Jun 19, 2009, 10:48 PM
iCharger
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Joined Mar 2007
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Hello Sir,

Quote:
Originally Posted by Dekker
I am also very interested in this measuring tool, but I would also like to see a higher sampling rate, like max 4 measurements/sec.

If I order one now, will it be possible to change the sampling rate through a firmware update, or is it fixed in the hardware?
Thank you for your focus on our CellLog. Now the sampling rate is 2 measurements/sec. But if it is improved in the following days, it can be fixed via USB port for updating.

Quote:
Originally Posted by Dekker
Another question:

Do you need the Balance Connector Conversion Board as mentioned in the manual or will the Cellog also take balancer connectors directly?
The conversion board seems huge and certainly will not fit in my heli together with the Cellog.
As for the balance board, if it is EH, or XH, it will be OK; but if it's Thunderpower or Polyquest type, it needs conversion board and wires to fit with the CellLog.

Regards,
Junsi
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Old Jun 20, 2009, 02:55 AM
Registered User
Melbourne, Australia
Joined May 2006
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Quote:
Originally Posted by Junsi
...if it's Thunderpower or Polyquest type, it needs conversion board and wires to fit with the CellLog.
You can probably solve the problem with a TP-to-XH or PQ-to-XH balance adapter lead which will be easier to fit on the heli and also give you more flexibility in mounting the CellLog since most packs have very short balance leads.
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Old Jun 21, 2009, 01:08 PM
M0unt@in M0del$ minion
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United States, AZ, Mesa
Joined Jul 2002
7,247 Posts
Quote:
Originally Posted by write2dgray
Cell Log 8S are now available and shipping.

- David
I'm starting to fly some bigger and heavier planes that push my packs a little harder and I like the idea of recording individual cell voltages during actual flight loads. I have an EagleTree V3 but it only shows overall pack voltage. I think the Cell Log may be a useful tool to help me see how my packs are doing "real world" in my airplanes/heli. The price is reasonable too. I think I'll get one ordered up.

Joe
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Old Jun 21, 2009, 02:33 PM
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Delft, Netherlands
Joined Jul 2001
233 Posts
Yep, mine is on the way too :-)
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