Hello Steve,
Contact the dealer and say you sent me the wrong charger. It will not
charge a 156 volt pack batteries as per USB specifications to 7.75 volt per
battery at a battery temperature of 80F.
You won't be able to do any temperature compensation which would add 0.028
volts per cell for every 10 degrees drop of temperature below 80F.
Now if you charger is temperature compensated, then it should drop the
charger voltage 0.028 volts for every 10 degrees above 80F. The charger
should be in the same ambient temperature of the batteries it should have a
remote temperature sensor from the charger to the battery compartment.
It could be that the charger temperature compensation control is not
adjusted right or does not have one.
If you batteries get to 120 F during charging, that 120 -80 = 40. 40 / 10 =
4. 4 x 0.028 volts per cell = .112 volt drop per cell or .336 volts per
battery. The 7.75V charge at 80F now becomes 7.75-.336 = 7.414 volts.
The total pack charge now becomes 7.414 x 26 = 192.764 volts which is still
higher than your maximum 180 volt charger.
My average temperature of my batteries are at 70 F. which are in a 20
R-factor plus compartment which would require 7.75 + 0.028 = 7.83 volts or
26 x 7.83 = 203.58 volts for 26 batteries.
I am using a PFC-50B charger where I am charging 30 each USB 6 volt
batteries to 7.83 volts per battery at a battery temperature of 65 F. which
was setting for about a hour in ambient temperature of 5 below It only
takes about 4 minutes per mile to charge these batteries which will may
increase the battery temperature to 70 to 75 F degrees.
Roland
----- Original Message -----
From: "Steve Kobb" <[email protected]>
To: <[email protected]>
Sent: Sunday, December 05, 2010 8:40 AM
Subject: [EVDL] New charger: Wrong profile?
>
> I recently got a new charger for the 26 batteries that power my 2002 Chevy
> S-10.
>
> I'm concerned that the installed charging curve is not appropriate for
> these
> 6v flooded lead acid batteries.
>
> During charging, the pack voltage never goes beyond 180v.
>
> This got my attention because USB recommends a build-up to 7.75v per batt,
> which would finish out at 201.5v for all 26. Even if I were shooting for
> 7.5v per, that would end up as a total of 195v.
>
> Unfortunately, the charger never makes it all the way through its cycle.
> While the pack voltage stays at 180v, the batteries start to heat up.
>
> Finally, after six hours or so, the center-most battery gets up to 120
> degrees F, and the charger shuts down in error mode.
>
> And if that's not strange enough, here's some additional info...
>
> There are 3 stickers on the device, and all 3 say "144v". Only the rear
> sticker has a piece of tape on it, where someone has written "156v".
> Furthermore, the product itself came in a box that clearly said 144v.
>
> So now I don't know if I have a 156v charger with the wrong profile, or a
> 144v device that has been improperly modified.
>
> Or maybe there's some other explanation.
>
> My pack is 2 years old. Somehow, I don't think it will survive much longer
> if the individual batts are consistently undercharged and overheated.
>
> Names of the manufacturer and dealer have not been mentioned because I
> want
> to get my understanding straight before pressing forward on this issue.
>
> Any insights you might have would be appreciated.
>
>
> Steve Kobb
> http://www.myelectrictruck.com
> --
> View this message in context:
> http://electric-vehicle-discussion-list.413529.n4.nabble.com/New-charger-Wrong-profile-tp3073401p3073401.html
> Sent from the Electric Vehicle Discussion List mailing list archive at
> Nabble.com.
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
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_______________________________________________
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| Multiple-address or CCed messages may be rejected.
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Contact the dealer and say you sent me the wrong charger. It will not
charge a 156 volt pack batteries as per USB specifications to 7.75 volt per
battery at a battery temperature of 80F.
You won't be able to do any temperature compensation which would add 0.028
volts per cell for every 10 degrees drop of temperature below 80F.
Now if you charger is temperature compensated, then it should drop the
charger voltage 0.028 volts for every 10 degrees above 80F. The charger
should be in the same ambient temperature of the batteries it should have a
remote temperature sensor from the charger to the battery compartment.
It could be that the charger temperature compensation control is not
adjusted right or does not have one.
If you batteries get to 120 F during charging, that 120 -80 = 40. 40 / 10 =
4. 4 x 0.028 volts per cell = .112 volt drop per cell or .336 volts per
battery. The 7.75V charge at 80F now becomes 7.75-.336 = 7.414 volts.
The total pack charge now becomes 7.414 x 26 = 192.764 volts which is still
higher than your maximum 180 volt charger.
My average temperature of my batteries are at 70 F. which are in a 20
R-factor plus compartment which would require 7.75 + 0.028 = 7.83 volts or
26 x 7.83 = 203.58 volts for 26 batteries.
I am using a PFC-50B charger where I am charging 30 each USB 6 volt
batteries to 7.83 volts per battery at a battery temperature of 65 F. which
was setting for about a hour in ambient temperature of 5 below It only
takes about 4 minutes per mile to charge these batteries which will may
increase the battery temperature to 70 to 75 F degrees.
Roland
----- Original Message -----
From: "Steve Kobb" <[email protected]>
To: <[email protected]>
Sent: Sunday, December 05, 2010 8:40 AM
Subject: [EVDL] New charger: Wrong profile?
>
> I recently got a new charger for the 26 batteries that power my 2002 Chevy
> S-10.
>
> I'm concerned that the installed charging curve is not appropriate for
> these
> 6v flooded lead acid batteries.
>
> During charging, the pack voltage never goes beyond 180v.
>
> This got my attention because USB recommends a build-up to 7.75v per batt,
> which would finish out at 201.5v for all 26. Even if I were shooting for
> 7.5v per, that would end up as a total of 195v.
>
> Unfortunately, the charger never makes it all the way through its cycle.
> While the pack voltage stays at 180v, the batteries start to heat up.
>
> Finally, after six hours or so, the center-most battery gets up to 120
> degrees F, and the charger shuts down in error mode.
>
> And if that's not strange enough, here's some additional info...
>
> There are 3 stickers on the device, and all 3 say "144v". Only the rear
> sticker has a piece of tape on it, where someone has written "156v".
> Furthermore, the product itself came in a box that clearly said 144v.
>
> So now I don't know if I have a 156v charger with the wrong profile, or a
> 144v device that has been improperly modified.
>
> Or maybe there's some other explanation.
>
> My pack is 2 years old. Somehow, I don't think it will survive much longer
> if the individual batts are consistently undercharged and overheated.
>
> Names of the manufacturer and dealer have not been mentioned because I
> want
> to get my understanding straight before pressing forward on this issue.
>
> Any insights you might have would be appreciated.
>
>
> Steve Kobb
> http://www.myelectrictruck.com
> --
> View this message in context:
> http://electric-vehicle-discussion-list.413529.n4.nabble.com/New-charger-Wrong-profile-tp3073401p3073401.html
> Sent from the Electric Vehicle Discussion List mailing list archive at
> Nabble.com.
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>
_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev