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12-28-2020, 10:20 AM | #11 | |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: Battery question again
Quote:
Trojan also recommends increasing the charge voltage by 0.0028vpc for each degree below 77F, that refers to the battery temperature and not the ambient temperature. I did a simple on/off switch on my OBC using two diodes in series to create a 20F lower temperature adjustment for charging. It made the bulk-to-absorption voltage threshold change from 56.9 to 58.3v. I only did that on the last winter before switching to Lithium so I have no long term data to know if it was effective. |
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12-28-2020, 11:26 AM | #12 |
Gone Wild
Join Date: Sep 2011
Location: East Michigan
Posts: 1,364
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Re: Battery question again
Here is another question. If capacity is reduced by 20% for a giving temperature, would the voltage reflect that? So if a fully charged rested pack is lets say 60v would a fully charged pack then only show 48v reflecting the 20% loss?
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12-28-2020, 11:54 AM | #13 |
Gone Wild
Join Date: Nov 2016
Location: near Calgary, AB, Canada
Posts: 1,510
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Re: Battery question again
As per my post #6, in my experience, a low battery temperature does not affect the full charge stabilized voltage.
Does anyone else have a different experience with this? |
12-28-2020, 12:09 PM | #14 |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: Battery question again
Keep in mind a 100AH battery and a 200AH battery have the same final voltage so I am not sure You would be able to see a reduced capacity based on voltage.
You may notice the SOC voltage will drop faster as you remove energy from the battery at the colder temperature just like the SOC drops faster if you discharge at a higher current rate. |
12-28-2020, 12:21 PM | #15 | |
Gone Wild
Join Date: Sep 2011
Location: East Michigan
Posts: 1,364
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Re: Battery question again
Quote:
So when we are talking about capacity we are talking about run time and not voltage, correct? |
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12-28-2020, 12:40 PM | #16 |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: Battery question again
Capacity refers to the number of AH you can remove from a battery so it is directly related to run time.
SOC is a relative measurement after a full charge. The chemical reactions that take place inside a battery slow down in cold temperatures, that is good for storage (less voltage discharge) but not so good for driving. |
12-28-2020, 01:10 PM | #17 |
Gone Wild
Join Date: Jul 2010
Location: Peachtree City, Ga.
Posts: 2,759
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Re: Battery question again
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12-28-2020, 01:13 PM | #18 |
Gone Wild
Join Date: Sep 2011
Location: East Michigan
Posts: 1,364
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Re: Battery question again
Guess I will try an OBC reset and see if it changes anything. Everything was fine until the cold weather hit. Never had an issue like this with my last set of batteries which were US. My new set is Crown.
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12-28-2020, 02:00 PM | #19 | ||
MOD of all BS!
Join Date: Sep 2011
Location: Florida
Posts: 17,477
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Re: Battery question again
Quote:
Quote:
But remember, an OBC has to see 53.8v or it will keep running until the 16 hour limit is reached. You could still show 50.9v the next day, but the finishing charge (topping off) may not have completed which was definitely the case with ours then. So that's my experience and now we all have been able to share with the Op. so he is more educated. |
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12-28-2020, 02:02 PM | #20 | |
Gone Wild
Join Date: Jul 2010
Location: Peachtree City, Ga.
Posts: 2,759
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Re: Battery question again
Quote:
Over time capacity diminishes as the charge cycles build up also. No matter how good your battery maintenance is you only get so many charge cycles until end of life. I see this first when the chargers will no longer reach the peak voltage in their programing. Then I see more voltage sag when accelerating or going up a hill. Then range reduces significantly and when I can no longer go where I want to go without range anxiety I replace the pack with a full set of matched batteries. Over 20 years I get as little as 4 years and as much as 7 years from a pack. (2 carts) Mostly the difference is the number of charge cycles near as I can tell. Batteries have always been premium Trojans or Crowns. Never discharged below 60% based on voltage. YMMV |
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