HV Battery Self-discharge Rate
I got back from a 2 week trip.
I was careful to leave my FEH with a high charge when I parked. I parked with exactly 52.7% on the Scangauge SOC meter. I was gone 14 days. I returned and the SOC was 45.7% before starting. Exactly 7% charge lost in 14 days. ( or 0.5% per day ) It has been consistent like this the past couple of years. I never had the ability to check for this the first couple of years. I'm curious what other people are seeing. I'm curious if this is calculated, or the FEH "assumes" 0.5% per day. I'd like to know, how it knows the SOC lost being parked. It will be interesting to know if this gets worse with age. My 2005 FEH has about 117,000 miles. |
Re: HV Battery Self-discharge Rate
Since there is no load, there's only one way which you probably won't agree with, voltage.
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Re: HV Battery Self-discharge Rate
No load voltage at 52.7% = 339v
No load voltage at 45.7% two weeks later, 325v. 14v/250 cells = 0.05v per cell. Does 0.05v = 7% charge? Or did Ford lab test these 1000 times and find they average 0.5% loss per day and just use that as a basis? |
Re: HV Battery Self-discharge Rate
Originally Posted by gpsman1
(Post 225831)
No load voltage at 52.7% = 339v
No load voltage at 45.7% two weeks later, 325v. 14v/250 cells = 0.05v per cell. Does 0.05v = 7% charge? Or did Ford lab test these 1000 times and find they average 0.5% loss per day and just use that as a basis? |
Re: HV Battery Self-discharge Rate
I'm not sayin' anything. I'm asking. I'm asking other FEH owners who happen to also have SOC monitoring equipment to reply back with what they see in their own personal vehicles. If everyone reports 0.5% loss per day, that means something. If results are all over the place, that means somthing else.
Your hypothesis is one good one. Now we need more data. |
Re: HV Battery Self-discharge Rate
Originally Posted by gpsman1
(Post 225843)
I'm not sayin' anything. I'm asking. I'm asking other FEH owners who happen to also have SOC monitoring equipment to reply back with what they see in their own personal vehicles. If everyone reports 0.5% loss per day, that means something. If results are all over the place, that means somthing else.
Your hypothesis is one good one. Now we need more data. |
Re: HV Battery Self-discharge Rate
Parking my FEH again @ 52.7%. Will see how close the results were to last time.
I've done more and more research into LiION and while they have more energy per pound, they do not seem durable enough for Hybrid or Electric car use. Expected lifespan is 3 years, and 36,000 to 50,000 miles, top end. |
Re: HV Battery Self-discharge Rate
Originally Posted by gpsman1
(Post 226378)
Parking my FEH again @ 52.7%. Will see how close the results were to last time.
I've done more and more research into LiION and while they have more energy per pound, they do not seem durable enough for Hybrid or Electric car use. Expected lifespan is 3 years, and 36,000 to 50,000 miles, top end. |
Re: HV Battery Self-discharge Rate
Originally Posted by gpsman1
(Post 226378)
I've done more and more research into LiION and while they have more energy per pound, they do not seem durable enough for Hybrid or Electric car use. Expected lifespan is 3 years, and 36,000 to 50,000 miles, top end.
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Re: HV Battery Self-discharge Rate
Originally Posted by wptski
(Post 226398)
So, if they aren't any good why are they switching to Li-Ion? They are way easier to charge. I have a 1600mAH 17670 Li-Ion cell in a SureFire U2 Ultra flashlight for over two years without recharging and it still works. I have Li-Ion cells in other custom made LED flashlights with the same results.
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