epsom salt test

bigstik40 · 06-09-2013, 07:19 PM

So far, your readings have all been of the total pack voltage. It would be interesting to also see a set of individual battery voltage readings (especially when total pack reads only 36.7 v.). You may very well have one shorted or very weak cell in one of your batteries, causing the total to be low. - RAY

3WheelDumbo · 06-09-2013, 08:07 PM

I measured them all individually before and they were all within .1volts of eachother around 6.18... havent done it recently though

3WheelDumbo · 06-10-2013, 08:11 AM

Well that was short lived. The readings were down againn this morning
Initial SOC = 36.1v and took 2 hours to charge
1st charge cycle = 36.7v took 4 hours to charge
2nd charge cycle = 36.7v took 3.5 hours to charge
3rd charge cycle = 36.7v took 4 hours to charge
4th charge cycle = 36.6v took 3 hours to charge
5th charge cycle = 36.6v took 3 hours to charge
6th charge cycle = 36.4v took 1.5 hours to charge
7th charge cycle = 36.5v took 2 hours to charge
8th charge cycle = 37.8V took 2 hours to charge
9th charge cycle = 36.7 took 2 hours to charge

Maybe it is the charger, gotta test that thing in the near future before buying batts

3WheelDumbo · 06-11-2013, 07:54 AM

Back to 36.5V, test done dead batts is dead batts. Didnt cost me anything though so it was worth a try.

Final readings:
Initial SOC = 36.1v and took 2 hours to charge
1st charge cycle = 36.7v took 4 hours to charge
2nd charge cycle = 36.7v took 3.5 hours to charge
3rd charge cycle = 36.7v took 4 hours to charge
4th charge cycle = 36.6v took 3 hours to charge
5th charge cycle = 36.6v took 3 hours to charge
6th charge cycle = 36.4v took 1.5 hours to charge
7th charge cycle = 36.5v took 2 hours to charge
8th charge cycle = 37.8V took 2 hours to charge
9th charge cycle = 36.7 took 2 hours to charge
10th charge cycle = 36.5V took 1.5 hours to charge

scottyb · 06-11-2013, 08:16 AM

You should be charging much longer than that, like 4 Xs longer

06-09-2013, 07:19 PM	#41
bigstik40 Gone Wild Join Date: Sep 2010 Location: Erie, Pennsylvania Posts: 989	Re: epsom salt test So far, your readings have all been of the total pack voltage. It would be interesting to also see a set of individual battery voltage readings (especially when total pack reads only 36.7 v.). You may very well have one shorted or very weak cell in one of your batteries, causing the total to be low. - RAY

06-09-2013, 08:07 PM	#42
3WheelDumbo Getting Wild Join Date: May 2013 Location: Austin, TX Posts: 118	Re: epsom salt test I measured them all individually before and they were all within .1volts of eachother around 6.18... havent done it recently though

06-10-2013, 08:11 AM	#43
3WheelDumbo Getting Wild Join Date: May 2013 Location: Austin, TX Posts: 118	Re: epsom salt test Well that was short lived. The readings were down againn this morning Initial SOC = 36.1v and took 2 hours to charge 1st charge cycle = 36.7v took 4 hours to charge 2nd charge cycle = 36.7v took 3.5 hours to charge 3rd charge cycle = 36.7v took 4 hours to charge 4th charge cycle = 36.6v took 3 hours to charge 5th charge cycle = 36.6v took 3 hours to charge 6th charge cycle = 36.4v took 1.5 hours to charge 7th charge cycle = 36.5v took 2 hours to charge 8th charge cycle = 37.8V took 2 hours to charge 9th charge cycle = 36.7 took 2 hours to charge Maybe it is the charger, gotta test that thing in the near future before buying batts

06-11-2013, 07:54 AM	#44
3WheelDumbo Getting Wild Join Date: May 2013 Location: Austin, TX Posts: 118	Re: epsom salt test Back to 36.5V, test done dead batts is dead batts. Didnt cost me anything though so it was worth a try. Final readings: Initial SOC = 36.1v and took 2 hours to charge 1st charge cycle = 36.7v took 4 hours to charge 2nd charge cycle = 36.7v took 3.5 hours to charge 3rd charge cycle = 36.7v took 4 hours to charge 4th charge cycle = 36.6v took 3 hours to charge 5th charge cycle = 36.6v took 3 hours to charge 6th charge cycle = 36.4v took 1.5 hours to charge 7th charge cycle = 36.5v took 2 hours to charge 8th charge cycle = 37.8V took 2 hours to charge 9th charge cycle = 36.7 took 2 hours to charge 10th charge cycle = 36.5V took 1.5 hours to charge

06-11-2013, 08:16 AM	#45
scottyb Happy Carting Join Date: Dec 2007 Location: Southern California Posts: 73,417	Re: epsom salt test You should be charging much longer than that, like 4 Xs longer

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