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Open Roads Forum  >  Tech Issues

 > Converter/Charger Questions.

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Reisender

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Posted: 04/14/22 08:19am Link  |  Quote  |  Print  |  Notify Moderator

ken56 wrote:

If you are comfortable with the knowledge that these batteries can catch fire then go for it. Tesla's have Lithium Ion batteries and some catch fire. Just like those things the kids ride around on today, they can catch fire. Phones catch fire some times. That's why they don't recommend leaving them plugged in to charge over night while you are sleeping. Li-ion batteries are very sensitive to high temperatures. I use an AGM with a good amp hour rating and I don't worry.


Teslas are about 40 times less likely to catch fire than a gas vehicle.

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Posted: 04/14/22 09:13am Link  |  Quote  |  Print  |  Notify Moderator

Nitpic. You can't say X times less. Times is more. 1/40th as often ? Clumsy. Can reverse to say gas 40 times more likely


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Posted: 04/14/22 09:19am Link  |  Quote  |  Print  |  Notify Moderator

BFL13 wrote:

Nitpic. You can't say X times less. Times is more. 1/40th as often ? Clumsy. Can reverse to say gas 40 times more likely


Makes sense. My bad.

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Posted: 04/14/22 09:29am Link  |  Quote  |  Print  |  Notify Moderator

Your editting invoice has been added to your CRA account [emoticon]

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Posted: 04/14/22 10:00am Link  |  Quote  |  Print  |  Notify Moderator

BFL13 wrote:

Your editting invoice has been added to your CRA account [emoticon]


Lol. [emoticon]

pianotuna

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Posted: 04/14/22 12:48pm Link  |  Quote  |  Print  |  Notify Moderator

ken56 wrote:

If you are comfortable with the knowledge that these batteries can catch fire then go for it. Tesla's have Lithium Ion batteries and some catch fire. Just like those things the kids ride around on today, they can catch fire. Phones catch fire some times. That's why they don't recommend leaving them plugged in to charge over night while you are sleeping. Li-ion batteries are very sensitive to high temperatures. I use an AGM with a good amp hour rating and I don't worry.


Hi Ken56,

I have loads of reasons why I think Li are fussy. This is not one of my concerns with LiFePo4, since the advent of built in battery management systems on the jar.

flyfishing48,

Charging to 100% is not desirable for Li, if you wish to have maximum cycle life. Neither is float charging.


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Posted: 04/14/22 01:12pm Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

Charging to 100% is not desirable for Li, if you wish to have maximum cycle life. Neither is float charging.
Float charging like lead-acid above the resting voltage is not the best for LFP. Properly floating 100mV to 200mV below resting is no problem at all. That would be 13.2 on a 12v LFP that would ordinarily rest at 13.4 volts and will not affect longevity.

This is part of the reason "lithium" converters do not work well with LFP batteries. Many will float at 13.6 to 14.6 volts and reduce the life.


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Posted: 04/16/22 09:38am Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

pianotuna wrote:

Charging to 100% is not desirable for Li, if you wish to have maximum cycle life. Neither is float charging.
Float charging like lead-acid above the resting voltage is not the best for LFP. Properly floating 100mV to 200mV below resting is no problem at all. That would be 13.2 on a 12v LFP that would ordinarily rest at 13.4 volts and will not affect longevity.

This is part of the reason "lithium" converters do not work well with LFP batteries. Many will float at 13.6 to 14.6 volts and reduce the life.
There are compromises no matter how you use a lifepo4. Users can choose to focus on max longevity, max charge/discharge performance, or anywhere in between.

Focus on max charge/discharge performance (high c charge/discharge) and get 1000 - 2000 cycles.

Focus on max longevity (low c charge/discharge) and get 3000 - 4000 cycles.

1000 cycles, the worst case scenario, will net the average user at least 10-15 years of use before the battery experiences a 20% reduction in ah capacity.

In this context, are elaborate charge/discharge protocols really all that necessary or important?

flyfishing48

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Posted: 04/16/22 10:57am Link  |  Quote  |  Print  |  Notify Moderator

Thanks for all of the discussion. It has been most helpful


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Posted: 04/19/22 07:18pm Link  |  Quote  |  Print  |  Notify Moderator

Lots of thanks for the tons of info in the replies.

I have been trying to find a Progressive Dynamics convert/charger to replace the WFCO WF 9855 that came with my 5er.

I can't seem to find a 55 amp like my WFCO unit. (A plug in floor mount).

I can find a 60 amp one though. Would that b a close enough match ?

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