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08-25-2017, 07:30 AM | #11 |
Wild Gone
Join Date: Oct 2016
Location: Davie, FL
Posts: 633
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Re: What size Power Resistor do I need to pull down lithium cells?
Since your goal is to just get the voltage the same across all your cells, why not charge each cell to the highest voltage cell then connect your BMS and let it top balance for you.
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08-25-2017, 05:24 PM | #12 | |||
Gone Wild
Join Date: Jun 2015
Location: St. Augustine, FL
Posts: 328
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Re: What size Power Resistor do I need to pull down lithium cells?
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agpfl, the only issue I am finding, after investigating your suggestion, is that I cannot find a charger that will limit voltage to 4.0V, which is the max continuous allowed for my cells, with a 10s 4.1V pulse specified. They are all 3.6, 3.7, or 4.2. |
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08-26-2017, 12:10 AM | #13 | |
Over This Interview Is...
Join Date: Jun 2012
Location: AZ
Posts: 17,449
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Re: What size Power Resistor do I need to pull down lithium cells?
Quote:
Also, don't worry about the "quiz", many here have far more knowledge than I, and it's just there to get people to think about the curcuit they are trying to understand (and an "easy" chart to relate the figures to). You are doing great. |
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08-26-2017, 01:19 AM | #14 |
Gone Wild
Join Date: Jun 2015
Location: St. Augustine, FL
Posts: 328
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Re: What size Power Resistor do I need to pull down lithium cells?
Well, I started draining the first paralleled cell. Stayed up checking on family in Beaumont, TX, and recorded these numbers. Going to bed, so I'll miss the next several readings.
Start: 3.86 +2H = 3.76 +4H = 3.66 +6H = 3.60 |
08-26-2017, 10:09 AM | #15 | |
Gone Wild
Join Date: Jun 2015
Location: St. Augustine, FL
Posts: 328
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Re: What size Power Resistor do I need to pull down lithium cells?
Quote:
+14H = 3.32 +15H = 3.29 Starting the next cell, going to have a buddy bring some more resistors and either drain cells faster, or build several sets of power sinks and do multiple cells at the time. |
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